CA2362821A1 - Multilayer fuel tank with cover and fuel vapour collection chamber - Google Patents
Multilayer fuel tank with cover and fuel vapour collection chamber Download PDFInfo
- Publication number
- CA2362821A1 CA2362821A1 CA002362821A CA2362821A CA2362821A1 CA 2362821 A1 CA2362821 A1 CA 2362821A1 CA 002362821 A CA002362821 A CA 002362821A CA 2362821 A CA2362821 A CA 2362821A CA 2362821 A1 CA2362821 A1 CA 2362821A1
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- Canada
- Prior art keywords
- fuel
- fuel tank
- tank
- vapour
- seams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/03177—Fuel tanks made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/03032—Manufacturing of fuel tanks
- B60K2015/03059—Fuel tanks with double shells or more
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
- B60K2015/03509—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems with a droplet separator in the vent line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
- B60K2015/03514—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems with vapor recovery means
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
A multilayered fuel tank (10) for a motor vehicle is disclosed having a fuel tank body (32) for holding liquid and vapour fuel comprising a bottom wall (46), side walls (45) and a top wall and a plurality of fuel tank components (35) located on the top wall and seams (37) located on the side walls. A tan k cover (36) is connected to the fuel tank body to define a vapour collection chamber (34). The tank cover encapsulates the top wall and the fuel tank components and seams thereby trapping any fuel vapours that may escape from the tank body, the fuel tank components and the seams. Also disclosed is a method of making the multilayered fuel tank and a method of preventing fuel vapours from escaping from a fuel tank to the environment.
Description
MULTILAYER FUEL TANK WITH COVER
AND FUEL VAPOUR COLLECTION CHAMBER
Field of the Invention:
This invention relates to fuel tanks for automobiles, and in particular, to plastic multilayered fuel tanks that prevent hydrocarbon fuel vapours from escaping to the environment.
Background of the Invention:
Due to environmental concerns relating to the emission of hydrocarbon vapours from fuel tank systems in motor vehicles, the Government of the United States of America, amongst others, is now demanding that motor vehicle fuel tank systems built as of 2003 provide virtually no hydrocarbon vapour emissions to the environment.
Moreover, the specifications will require that the fuel tanks maintain this low level of emissions during the lifetime of the motor vehicle.
Presently, a majority of motor vehicle fuel tank systems made are of plastic, however, one drawback is that they tend emit some amount of hydrocarbon fuel vapours to the environment. Most of these hydrocarbon vapour emissions occur through the fuel tank's hoses, connectors, seals, tank seams, etc. generally located at the top of the fuel tanks. Figure 1 is a schematic sketch showing in general the emission of hydrocarbon vapours from these locations on the prior art fuel tanks.
The prior art has several examples of fuel tanks that include means for trapping liquid or vapour fuel. However, none of the prior art fuel tanks are designed and intended to prevent or minimize the leakage of hydrocarbon vapour to the environment.
U.S. Patent No. 3,804,291 to Fricker discloses a venting and pressure release device for fuel tanks, in which a container (preferably made of synthetic plastic material) is provided on the inside of the fuel tank within the highest area and located at least partially above the maximum filling height. Fuel vapours in the fuel tank travel through a number of channels between the upper tank wall and the upper wall of the container to a dome structure mounted on or arranged on the top of the fuel tank before exiting the tank via another series of gaps and channels and a vent pipe. The dome may also be made in one piece with the upper container parts or mounted thereon.
Fricker also teaches a tank principle in which only one, possibly rigid line for the venting of the tank has to be extended to the outside so that connecting places located outside of the tank are eliminated.
U.S. Patent No. 3,917,109 issued to MacDonald discloses a vent system that minimizes the possibility of vapour leakage to the atmosphere. It discloses a fuel tank for motor vehicles having a dome-shaped portion rising above the upper surface of the tank. The dome portion provides for a vapour space and in which a liquid-vapour separator is mounted. The separator is an enclosed container that serves as a locus for the collection of those vapours by flow thereof into a vapour vent conduit in addition to being a device for separating vapours from liquid fuel and acting as a baffle to prevent liquid fuel carryover.
MacDonald teaches that fuel vapours exit the fuel tank and the separator by entering a single vapour vent conduit that communicates between the interior of the separator and the exterior of the fuel tank. One end of the vapour vent conduit is extended into the doomed portion and the other end is extended to a charcoal canister and ultimately to an engine or any appropriate vapour receiving means on the motor vehicle.
U.S. Patent No. 4,714,171 issued to Sasaki et al. discloses a vent system for venting fuel vapour from a fuel tank of a motor vehicle. The Sasaki vent system comprises a fuel tank constructed of moulded plastics with a depressed portion which protrudes into a vapour chamber defined at an upper portion of the interior of the fuel tank; a structure of moulded plastic which defines an enclosed chamber at a position above the maximum level of fuel in the fuel tank and means for fluid communication;
namely, pipes, connectors and tubing.
Fuel vapours produced in the fuel tank are led into the enclosed chamber and the vapours are then led to a canister and trapped by the same. The enclosed chamber may be a deepened recess formed in an upward swelled portion of the fuel tank, or it may be the chamber of a separate vapour separator of moulded plastic which is either detachably mounted on the fuel tank or mounted on the upper wall of the fuel tank.
The enclosed chamber may also have an opening having a lid sealingly attached to it.
U.S. Patent No. 4,836,402 issued to Sasaki discloses a vent system for venting fuel vapour from a fuel tank of an automotive vehicle. The Sasaki fuel tank has a top wall, a vacant space between the top wall and the surface of fuel filled, and a separator chamber in the vacant space having a number of vent pipes for venting fuel vapour from the fuel tank. The fuel vapour is first drawn through the vent pipes into the separator chamber and then to a carbon canister outside the fuel tank.
U.S. Patent No. 5,398,839 issued to Kyeln discloses a fuel tank encapsulated by an outer shell (preferably made of molded plastic material), and having a space between the outer shell and the fuel tank. Any liquid fuel leaking from the fuel tank is trapped by fuel absorbent material filling the space between the fuel tank and the outer shell and prevented from escaping to the environment. The Kyeln fuel tank may also be connected to a vapour recovery system. Kyeln also discloses an injection moulding apparatus for making such a fuel tank.
The present invention addresses these environmental problems associated with plastic fuel tanks, and also other problems as described below. Accordingly, it is an object of one aspect of the present invention to provide a fuel tank in which hydrocarbon vapour leaks from the tank body are contained and encapsulated within a separate vapour chamber. This additional vapour collection chamber of the fuel tank traps vapours instead of being released into the environment. In a preferred embodiment, the charcoal canister filter on the fuel tank is operatively connected to the vapour chamber for directing the leaked hydrocarbon vapours to the engine for combustion.
It is another object of another aspect of the present invention to provide a method of preventing vapour fuel from escaping from a motor vehicle fuel tank to the environment.
Summary of the Invention:
Accordingly, in one aspect of the present invention, there is provided a multilayered fuel tank for a motor vehicle, comprising:
05-03-2001 'D5-Q 1 l 9 ai From: D I tWCK STRATTON CLAR I Z I O ~ 4199116638 T-4169?16638 (a) a fuel tank body for holding liquid and vapour fuel comprising a bottom wall, side walls and s top wall:
(b) a plurality of fuel tank components located on the tap wall and seams located oa the side walls; and (c) a tank cover connected to the fud tarok body and dafinipg a vapour oolloction chamber, the sank cover protecting and encapsulatins the top welt and the foal tank coraponcats and seams thereby trapping any fuel vapours that escape from the tank body, t~ fuel tank components and the resins.
tn a second aspect of the present invetriion, there is provided sn acxasosy far n motor vehicle fuel tank comprising a bottom wall, side walls, a top wall, seams and a plurality of fuel tank components located on the top wall, the accessory comprising:
a tank cover for connection to the fuel tank to define a vapour collection chamber, the tank cover protecting and encapsulating the top wall, the fuel tank components and the seams thereby trapping any fuel vapours that may GSCape ft~onl the tank body, the ftlel tank components and the seams during use of the furl tank.
In a third aspect of the present invention, there is provided a method of tusking a mult~7ayered fuel tank for pting the escape of fuel vapour to the environment, the method comprising:
(a) providing a fool task body for holding liquid fuel and vapow comprisins a bottom wall, side walls and a top wall sad a plurality of fuel tank components located on the top wall and seams located on the side walls; and (b) connecting a tank cover to she ftlel tank body, the tank cover defining a vapour coileation chamber and protecting and encapsulating the top wall and the fool tank components and seams thereby trapping any fuel vapours that may escape from the tank body, the fuel tank components Ontvangst tiid 'AMENDEDSHEETI~fdruk tied 6.nrt, 7:37 05-03-2001 '.'S5-01 16:22 Fron:DIIbOCK STRATTON tLAR1210 4169T16b38 T-13,. , ."" " ,",~-,oq and the seams when in use.
1n a thrther embodiment of the present invention, a method is provided of preventing feel vapour from escaping from a itiel tank for mover vehicl~a to tho e~rvison~neat, 5 comprising:
(a) providing a fuel tank body for holding liquid fuel and vapour coanprising a bottom wall, side walls read a top wall, and a plurality of fuel tank coraponeass located on tho top wall and seams located on the side walls;
(b) connecting a tank rover to the fuel tank body, the tank cover defining a vapour collection chamber and protecting and encapsulating the top wall and the fuel tank components and seams thereby trapping any fuel vapours that may escape from the tank body, the fact tank components and the scams; and (c) directing the trsppod fu~1 vapours through a charcoal cannister filter to the motor vehicle engine for combustion.
Brief Description of tire Drawings:
The preferred embodimonts of the present invention will be described with reference to the accompanying drawings in which like numerals refer to the sates parts in the several views and is which:
Fig. 1 is a schematic viow of a motor vohicle fuel tank of the prior s~'t illustrating the oscape of hydrocarbon vapours:
Fig. 2 is a cross-section view of one ~bodiment of the fuel tank of the present invention showing a cover bonded to a tank body and defining a vapour collection chamber;
Fig. 3 a and 3b iliastrate the bonding of the tank cover to the Jlltel tank body;
Fig. 4 illustrates the ftre resistance properties of the fool tank of the present invention;
and Fig, 5 illustrates the souiul proofing properties of the fuel tank of the present invention.
Ontvangst ti jd AMENDED SHEET.fdruk ti jd 6. mrt. 7:37 ~05-Di 16:23 F~oe:DIIAOCK STRATTON ClARt110 ~ 41ti9T18638 T-ig PCT/CA00/00167 Sa DetsWed Description otthe Preferred l~a>tbodt3nents:
Fig. 1 illustrates a typical motor vehicle feel tn~ak 10 currently used by motor vehicle ~ufacauers. The fuel tank 10 is generally const:ucted from two parts, a lowtr portion 12 and an upper portion 14 co>mectod together ac the sewn 16, Lvestred as the top wall 18 are the fuel tst~lc compone~s 20, which may include haSGS, valves.
comiectors, charcoal csuistor filtacs sad cable:. Fig. 1 further illustrates areas aru the fuel tank 10 that may cause hydrocarbon vapour leaks (designated by arrows).
Fig. 2 illustrates oae embodiment of the tnult0ayaicd fucl tank 30 of 8~e passant invention. The fucl tank 30 consists of a tsnlc body 32 that holds liquid and v~otts foal, ~d an additional vapour collection chamber 34 or comparimettt that Ontvangst tijd ~AMENDEDSHEET,fdruk tijd 6.mrt. 7;3~
AND FUEL VAPOUR COLLECTION CHAMBER
Field of the Invention:
This invention relates to fuel tanks for automobiles, and in particular, to plastic multilayered fuel tanks that prevent hydrocarbon fuel vapours from escaping to the environment.
Background of the Invention:
Due to environmental concerns relating to the emission of hydrocarbon vapours from fuel tank systems in motor vehicles, the Government of the United States of America, amongst others, is now demanding that motor vehicle fuel tank systems built as of 2003 provide virtually no hydrocarbon vapour emissions to the environment.
Moreover, the specifications will require that the fuel tanks maintain this low level of emissions during the lifetime of the motor vehicle.
Presently, a majority of motor vehicle fuel tank systems made are of plastic, however, one drawback is that they tend emit some amount of hydrocarbon fuel vapours to the environment. Most of these hydrocarbon vapour emissions occur through the fuel tank's hoses, connectors, seals, tank seams, etc. generally located at the top of the fuel tanks. Figure 1 is a schematic sketch showing in general the emission of hydrocarbon vapours from these locations on the prior art fuel tanks.
The prior art has several examples of fuel tanks that include means for trapping liquid or vapour fuel. However, none of the prior art fuel tanks are designed and intended to prevent or minimize the leakage of hydrocarbon vapour to the environment.
U.S. Patent No. 3,804,291 to Fricker discloses a venting and pressure release device for fuel tanks, in which a container (preferably made of synthetic plastic material) is provided on the inside of the fuel tank within the highest area and located at least partially above the maximum filling height. Fuel vapours in the fuel tank travel through a number of channels between the upper tank wall and the upper wall of the container to a dome structure mounted on or arranged on the top of the fuel tank before exiting the tank via another series of gaps and channels and a vent pipe. The dome may also be made in one piece with the upper container parts or mounted thereon.
Fricker also teaches a tank principle in which only one, possibly rigid line for the venting of the tank has to be extended to the outside so that connecting places located outside of the tank are eliminated.
U.S. Patent No. 3,917,109 issued to MacDonald discloses a vent system that minimizes the possibility of vapour leakage to the atmosphere. It discloses a fuel tank for motor vehicles having a dome-shaped portion rising above the upper surface of the tank. The dome portion provides for a vapour space and in which a liquid-vapour separator is mounted. The separator is an enclosed container that serves as a locus for the collection of those vapours by flow thereof into a vapour vent conduit in addition to being a device for separating vapours from liquid fuel and acting as a baffle to prevent liquid fuel carryover.
MacDonald teaches that fuel vapours exit the fuel tank and the separator by entering a single vapour vent conduit that communicates between the interior of the separator and the exterior of the fuel tank. One end of the vapour vent conduit is extended into the doomed portion and the other end is extended to a charcoal canister and ultimately to an engine or any appropriate vapour receiving means on the motor vehicle.
U.S. Patent No. 4,714,171 issued to Sasaki et al. discloses a vent system for venting fuel vapour from a fuel tank of a motor vehicle. The Sasaki vent system comprises a fuel tank constructed of moulded plastics with a depressed portion which protrudes into a vapour chamber defined at an upper portion of the interior of the fuel tank; a structure of moulded plastic which defines an enclosed chamber at a position above the maximum level of fuel in the fuel tank and means for fluid communication;
namely, pipes, connectors and tubing.
Fuel vapours produced in the fuel tank are led into the enclosed chamber and the vapours are then led to a canister and trapped by the same. The enclosed chamber may be a deepened recess formed in an upward swelled portion of the fuel tank, or it may be the chamber of a separate vapour separator of moulded plastic which is either detachably mounted on the fuel tank or mounted on the upper wall of the fuel tank.
The enclosed chamber may also have an opening having a lid sealingly attached to it.
U.S. Patent No. 4,836,402 issued to Sasaki discloses a vent system for venting fuel vapour from a fuel tank of an automotive vehicle. The Sasaki fuel tank has a top wall, a vacant space between the top wall and the surface of fuel filled, and a separator chamber in the vacant space having a number of vent pipes for venting fuel vapour from the fuel tank. The fuel vapour is first drawn through the vent pipes into the separator chamber and then to a carbon canister outside the fuel tank.
U.S. Patent No. 5,398,839 issued to Kyeln discloses a fuel tank encapsulated by an outer shell (preferably made of molded plastic material), and having a space between the outer shell and the fuel tank. Any liquid fuel leaking from the fuel tank is trapped by fuel absorbent material filling the space between the fuel tank and the outer shell and prevented from escaping to the environment. The Kyeln fuel tank may also be connected to a vapour recovery system. Kyeln also discloses an injection moulding apparatus for making such a fuel tank.
The present invention addresses these environmental problems associated with plastic fuel tanks, and also other problems as described below. Accordingly, it is an object of one aspect of the present invention to provide a fuel tank in which hydrocarbon vapour leaks from the tank body are contained and encapsulated within a separate vapour chamber. This additional vapour collection chamber of the fuel tank traps vapours instead of being released into the environment. In a preferred embodiment, the charcoal canister filter on the fuel tank is operatively connected to the vapour chamber for directing the leaked hydrocarbon vapours to the engine for combustion.
It is another object of another aspect of the present invention to provide a method of preventing vapour fuel from escaping from a motor vehicle fuel tank to the environment.
Summary of the Invention:
Accordingly, in one aspect of the present invention, there is provided a multilayered fuel tank for a motor vehicle, comprising:
05-03-2001 'D5-Q 1 l 9 ai From: D I tWCK STRATTON CLAR I Z I O ~ 4199116638 T-4169?16638 (a) a fuel tank body for holding liquid and vapour fuel comprising a bottom wall, side walls and s top wall:
(b) a plurality of fuel tank components located on the tap wall and seams located oa the side walls; and (c) a tank cover connected to the fud tarok body and dafinipg a vapour oolloction chamber, the sank cover protecting and encapsulatins the top welt and the foal tank coraponcats and seams thereby trapping any fuel vapours that escape from the tank body, t~ fuel tank components and the resins.
tn a second aspect of the present invetriion, there is provided sn acxasosy far n motor vehicle fuel tank comprising a bottom wall, side walls, a top wall, seams and a plurality of fuel tank components located on the top wall, the accessory comprising:
a tank cover for connection to the fuel tank to define a vapour collection chamber, the tank cover protecting and encapsulating the top wall, the fuel tank components and the seams thereby trapping any fuel vapours that may GSCape ft~onl the tank body, the ftlel tank components and the seams during use of the furl tank.
In a third aspect of the present invention, there is provided a method of tusking a mult~7ayered fuel tank for pting the escape of fuel vapour to the environment, the method comprising:
(a) providing a fool task body for holding liquid fuel and vapow comprisins a bottom wall, side walls and a top wall sad a plurality of fuel tank components located on the top wall and seams located on the side walls; and (b) connecting a tank cover to she ftlel tank body, the tank cover defining a vapour coileation chamber and protecting and encapsulating the top wall and the fool tank components and seams thereby trapping any fuel vapours that may escape from the tank body, the fuel tank components Ontvangst tiid 'AMENDEDSHEETI~fdruk tied 6.nrt, 7:37 05-03-2001 '.'S5-01 16:22 Fron:DIIbOCK STRATTON tLAR1210 4169T16b38 T-13,. , ."" " ,",~-,oq and the seams when in use.
1n a thrther embodiment of the present invention, a method is provided of preventing feel vapour from escaping from a itiel tank for mover vehicl~a to tho e~rvison~neat, 5 comprising:
(a) providing a fuel tank body for holding liquid fuel and vapour coanprising a bottom wall, side walls read a top wall, and a plurality of fuel tank coraponeass located on tho top wall and seams located on the side walls;
(b) connecting a tank rover to the fuel tank body, the tank cover defining a vapour collection chamber and protecting and encapsulating the top wall and the fuel tank components and seams thereby trapping any fuel vapours that may escape from the tank body, the fact tank components and the scams; and (c) directing the trsppod fu~1 vapours through a charcoal cannister filter to the motor vehicle engine for combustion.
Brief Description of tire Drawings:
The preferred embodimonts of the present invention will be described with reference to the accompanying drawings in which like numerals refer to the sates parts in the several views and is which:
Fig. 1 is a schematic viow of a motor vohicle fuel tank of the prior s~'t illustrating the oscape of hydrocarbon vapours:
Fig. 2 is a cross-section view of one ~bodiment of the fuel tank of the present invention showing a cover bonded to a tank body and defining a vapour collection chamber;
Fig. 3 a and 3b iliastrate the bonding of the tank cover to the Jlltel tank body;
Fig. 4 illustrates the ftre resistance properties of the fool tank of the present invention;
and Fig, 5 illustrates the souiul proofing properties of the fuel tank of the present invention.
Ontvangst ti jd AMENDED SHEET.fdruk ti jd 6. mrt. 7:37 ~05-Di 16:23 F~oe:DIIAOCK STRATTON ClARt110 ~ 41ti9T18638 T-ig PCT/CA00/00167 Sa DetsWed Description otthe Preferred l~a>tbodt3nents:
Fig. 1 illustrates a typical motor vehicle feel tn~ak 10 currently used by motor vehicle ~ufacauers. The fuel tank 10 is generally const:ucted from two parts, a lowtr portion 12 and an upper portion 14 co>mectod together ac the sewn 16, Lvestred as the top wall 18 are the fuel tst~lc compone~s 20, which may include haSGS, valves.
comiectors, charcoal csuistor filtacs sad cable:. Fig. 1 further illustrates areas aru the fuel tank 10 that may cause hydrocarbon vapour leaks (designated by arrows).
Fig. 2 illustrates oae embodiment of the tnult0ayaicd fucl tank 30 of 8~e passant invention. The fucl tank 30 consists of a tsnlc body 32 that holds liquid and v~otts foal, ~d an additional vapour collection chamber 34 or comparimettt that Ontvangst tijd ~AMENDEDSHEET,fdruk tijd 6.mrt. 7;3~
encapsulates all of the fuel tank's components 35 and seams 37 to trap any hydrocarbon vapours that leak therefrom. The hydrocarbon vapours trapped in the vapour collection chamber 34 are then directed to and captured in a charcoal-canister filter 39 or the like and sent to the motor vehicle engine (not shown) for combustion as fuel.
The vapour collection chamber 34 is separate from the fuel reservoir 40 of the tank body 32 and is created above the tank body 32 by connecting a cover 36 over the upper portion 42 of the fuel tank 30 to provide a space (the vapour collection chamber 34) encapsulating all the tank components 35 (such as valves, hoses, connectors, etc.) and tank seams 37. As a result, all hydrocarbon vapours emitted through the tank components 35 and seams 37 are captured within the vapour collection chamber 34.
The cover 36 used to create the vapour collection chamber 34 is connected or bonded to the side walls 45 of the tank body 32 or to another suitable location on the tank body 34 so as to prevent the hydrocarbon vapours from escaping to the environment.
Preferably, the cover 36 encapsulates the tank body seams 37 so as to capture fuel vapour that may leak from the seams 37. The shape of the cover 36 generally parallels that of the top wall 44 and tank components 35. The space between the cover 36 and the top wall 44 and tank components 35 is generally about 1 mm to mm, but it may be greater in the area where tank components 35 are located.
The cover 36 may be made from any number of suitable materials. For example, it can be made of high-density polyethylene, or it may be made of the same material from which the tank body 32 is made (typically a six layer barrier material), or of any other suitable material.
Optionally, the cover 36 defining the vapour collection chamber 34 can be made of one or more separate cover pieces or segments that are then connected together and sealed over the upper portion 42 of the tank body 32. The cover 36 may also include a removable cap (not shown) to allow access into the vapour collection chamber for servicing of the fuel tank components 35.
The vapour collection chamber 34 is separate from the fuel reservoir 40 of the tank body 32 and is created above the tank body 32 by connecting a cover 36 over the upper portion 42 of the fuel tank 30 to provide a space (the vapour collection chamber 34) encapsulating all the tank components 35 (such as valves, hoses, connectors, etc.) and tank seams 37. As a result, all hydrocarbon vapours emitted through the tank components 35 and seams 37 are captured within the vapour collection chamber 34.
The cover 36 used to create the vapour collection chamber 34 is connected or bonded to the side walls 45 of the tank body 32 or to another suitable location on the tank body 34 so as to prevent the hydrocarbon vapours from escaping to the environment.
Preferably, the cover 36 encapsulates the tank body seams 37 so as to capture fuel vapour that may leak from the seams 37. The shape of the cover 36 generally parallels that of the top wall 44 and tank components 35. The space between the cover 36 and the top wall 44 and tank components 35 is generally about 1 mm to mm, but it may be greater in the area where tank components 35 are located.
The cover 36 may be made from any number of suitable materials. For example, it can be made of high-density polyethylene, or it may be made of the same material from which the tank body 32 is made (typically a six layer barrier material), or of any other suitable material.
Optionally, the cover 36 defining the vapour collection chamber 34 can be made of one or more separate cover pieces or segments that are then connected together and sealed over the upper portion 42 of the tank body 32. The cover 36 may also include a removable cap (not shown) to allow access into the vapour collection chamber for servicing of the fuel tank components 35.
As illustrated in Fig. 2, it will be understood that the cover 36 may be connected to any part of the tank body 32 so long as the cover 36 defines a vapour collection chamber 34 that insulates and encapsulates most if not all of the areas through which hydrocarbon vapour emissions occur. In the particular embodiment of Fig. 2, the cover 36 is connected at locations 50 below the tank seams 37 and at one location 52 on the top wall 44.
The hydrocarbon vapour emissions that are trapped within the vapour collection chamber 34 can then be directed through a charcoal canister filter 39 operatively connected to the chamber 34 and to the motor vehicle's engine where they are combusted.
The cover 36 of the present invention also allows the option of locating the charcoal canister filter 39 on the top wall 44 of the tank body 32, rather than at a remote location in the motor vehicle. This has the advantage that the canister filter 39 and any connections, hoses, etc. to the filter 39 are located within the vapour collection chamber 34, hence reducing hydrocarbon emissions from the filter 39 and thereby eliminating a further source of emissions.
In one embodiment of the present invention, the multilayered fuel tank 30 may be supplied with the cover 36 installed on the tank body 32. I11 another embodiment, the cover 36 may be provided as an accessory that is connected to currently used fuel tanks (such as that shown in Fig. 1) prior to installation of the fuel tank in a motor vehicle.
The cover 36 is connected to the upper portion 42 of the tank body 32, so that the lower portion 46 remains uncovered to allow for the direct strap/tank contact needed to secure the fuel tank 30 to the motor vehicle. Thus, the cover 36 is not an outer container containing an inner fuel tank. Moreover, there is no direct connection between the vapour collection chamber 34 and the reservoir of the tank body 32.
The cover 36 may be manufactured using known injection and blow moulding processes. A typical process may comprise blow molding two covers per cycle in one mould, with the cover's wall comprising five layers and having a thickness of approximately 2 mm. The two covers may then be separated by robot cutting and connected to the tank body by gluing or by plastic-welding methods such as infrared contact free welding, ultrasonic welding and emabond. Alternatively, the cover may be direct moulded onto the fuel tank body 32.
Fig. 3a, 3b and 4 illustrate typical welding of the cover 36 to the tank body 32. In Fig.
3a, the cover 36 is connected to a side wall 45 of the tank body 32, preferably below a ' tank seam (not shown in Fig. 3a). In Fig. 3b, the cover 36 is connected to at least one point on the top wall 44 of the tank body 32.
In Fig. 4, the cover 36 is shown connected at two locations. First, the cover 36 is sealed at location 50 below the tank seam 37. In a preferred embodiment, the seam 37 is created in an area of the side wall 45 where the wall is indented inwards towards the fuel reservoir 40, therefore in this area the distance between the cover 36 and side wall 45 may be greater than 1 to 3 mm. The vapour collection chamber 34 therefore encapsulates the tank seam 37 to capture any hydrocarbon vapours leaking from the seam 37.
The second welding location 52 is on the top wall 44 of the tank body 32. It will be understood that there may not be any weld locations on the top wall 44, or there may be a plurality of such locations. For example, Fig. 6 shows the cover 36 connected to the top wall 44 at several locations 52.
There are several advantages associated with each of the various embodiments of the cover 36 and vapour collection chamber 34 of the present invention. They include the following:
1. The cover 32 is located over all fuel tank components 35 and seams 37 to create an encapsulated vapour collection chamber 34 where hydrocarbon vapours leaked from the tank body 32 are captured;
2. The multilayered fuel tank 30 of the present invention will allow virtually no hydrocarbon vapour emissions to the environment over the average lifetime of a motor vehicle. This in contrast to currently available fuel tanks that experience an increase in hydrocarbon vapour emissions released due to the aging of the unprotected tank components on the top of the fuel tank;
3. Currently available fuel tank designs can be used with the cover 36 because the tank components 35, such as the hoses, connectors, charcoal canister filter, etc. do not have to be altered in any way for the cover 36 to be used to collect hydrocarbon vapour emissions;
4. Most, if not all, of the fuel tank seams 37 are inside the vapour collection chamber 34, therefore capturing all hydrocarbon vapour emissions from the seams 37 and preventing them from escaping to the environment;
5. The hydrocarbon vapours captured within the vapour collection chamber 34 are then directed to the charcoal canister filter 39 and subsequently sent to the engine for burning;
6. As all fuel tank components 35 are located in the vapour collection chamber 34 defined by the cover 36, they are provided with extra protection from damage during shipping of the fuel tank 30 to the assembly plant, installation of the fuel tank 30 in a motor vehicle and during impacts such as accidents, crash tests, etc.;
7. The top walls of currently used plastic fuel tanks tend to flex during negative pressure conditions inside the reservoir of the tank body. The addition of the cover 36 with its bonding at several locations on the top wall 44 provides additional stiffness to the top wall 44 of the tank body 32;
8. The vapour collection chamber 34 also provides additional fire protection to the top wall 44 and tank components 35, which are especially vulnerable during fire tests where the tank top is especially vulnerable in a fire (Fig. 5);
9. The cover 36 acts as an additional barrier to prevent fuel leaks from damaged tank components as a result of an accident, thereby increasing the motor vehicle safety; and 10. The cover 36 creates a double wall for the top portion 42 of the fuel 5 tank 30, which provides additional dampening of noise (illustrated by the arrows) created by the fuel pump 48 in the fuel tank 30 (Fig. 6).
Also provided in this invention is a method of making a multilayered fuel tank 30 for preventing the escape of hydrocarbon fuel vapour to the environment. The method generally comprises the steps o~
10 (a) providing a fuel tank body 32 for holding liquid fuel 33 and vapour comprising a top wall 44 and a number of fuel tank components 35 and seams 37 located on the top wall 44; and (b) connecting the cover 36 to the fuel tank body 32. The cover 36 defines the vapour collection chamber 34 and encapsulates the top wall 44 and the fuel tank components 35 and seams 37 thereby trapping any hydrocarbon vapours that may escape from the tank body 32, the fuel tank components 35 and the seams 37 when in use.
Further, there is also provided a method of preventing fuel hydrocarbon vapour from escaping from a fuel tank 30 to the environment. The method includes:
(a) providing a fuel tank body 32 for holding liquid fuel 33 and vapour comprising a top wall 44, and a number of fuel tank components 35 and seams 37 located on the top wall 44;
(b) connecting the cover 36 to the fuel tank body 32, the cover 36 defining a vapour collection chamber 34 and encapsulating the top wall 44 and the fuel tank components 35 and seams 37. Fuel hydrocarbon vapours are thereby trapped rather than escaping from the tank body 32, the fuel tank components 35 and the seams 37 to the environment; and (c) directing the trapped fuel hydrocarbon vapours through the charcoal cannister filter 39 to the motor vehicle engine for combustion.
The hydrocarbon vapour emissions that are trapped within the vapour collection chamber 34 can then be directed through a charcoal canister filter 39 operatively connected to the chamber 34 and to the motor vehicle's engine where they are combusted.
The cover 36 of the present invention also allows the option of locating the charcoal canister filter 39 on the top wall 44 of the tank body 32, rather than at a remote location in the motor vehicle. This has the advantage that the canister filter 39 and any connections, hoses, etc. to the filter 39 are located within the vapour collection chamber 34, hence reducing hydrocarbon emissions from the filter 39 and thereby eliminating a further source of emissions.
In one embodiment of the present invention, the multilayered fuel tank 30 may be supplied with the cover 36 installed on the tank body 32. I11 another embodiment, the cover 36 may be provided as an accessory that is connected to currently used fuel tanks (such as that shown in Fig. 1) prior to installation of the fuel tank in a motor vehicle.
The cover 36 is connected to the upper portion 42 of the tank body 32, so that the lower portion 46 remains uncovered to allow for the direct strap/tank contact needed to secure the fuel tank 30 to the motor vehicle. Thus, the cover 36 is not an outer container containing an inner fuel tank. Moreover, there is no direct connection between the vapour collection chamber 34 and the reservoir of the tank body 32.
The cover 36 may be manufactured using known injection and blow moulding processes. A typical process may comprise blow molding two covers per cycle in one mould, with the cover's wall comprising five layers and having a thickness of approximately 2 mm. The two covers may then be separated by robot cutting and connected to the tank body by gluing or by plastic-welding methods such as infrared contact free welding, ultrasonic welding and emabond. Alternatively, the cover may be direct moulded onto the fuel tank body 32.
Fig. 3a, 3b and 4 illustrate typical welding of the cover 36 to the tank body 32. In Fig.
3a, the cover 36 is connected to a side wall 45 of the tank body 32, preferably below a ' tank seam (not shown in Fig. 3a). In Fig. 3b, the cover 36 is connected to at least one point on the top wall 44 of the tank body 32.
In Fig. 4, the cover 36 is shown connected at two locations. First, the cover 36 is sealed at location 50 below the tank seam 37. In a preferred embodiment, the seam 37 is created in an area of the side wall 45 where the wall is indented inwards towards the fuel reservoir 40, therefore in this area the distance between the cover 36 and side wall 45 may be greater than 1 to 3 mm. The vapour collection chamber 34 therefore encapsulates the tank seam 37 to capture any hydrocarbon vapours leaking from the seam 37.
The second welding location 52 is on the top wall 44 of the tank body 32. It will be understood that there may not be any weld locations on the top wall 44, or there may be a plurality of such locations. For example, Fig. 6 shows the cover 36 connected to the top wall 44 at several locations 52.
There are several advantages associated with each of the various embodiments of the cover 36 and vapour collection chamber 34 of the present invention. They include the following:
1. The cover 32 is located over all fuel tank components 35 and seams 37 to create an encapsulated vapour collection chamber 34 where hydrocarbon vapours leaked from the tank body 32 are captured;
2. The multilayered fuel tank 30 of the present invention will allow virtually no hydrocarbon vapour emissions to the environment over the average lifetime of a motor vehicle. This in contrast to currently available fuel tanks that experience an increase in hydrocarbon vapour emissions released due to the aging of the unprotected tank components on the top of the fuel tank;
3. Currently available fuel tank designs can be used with the cover 36 because the tank components 35, such as the hoses, connectors, charcoal canister filter, etc. do not have to be altered in any way for the cover 36 to be used to collect hydrocarbon vapour emissions;
4. Most, if not all, of the fuel tank seams 37 are inside the vapour collection chamber 34, therefore capturing all hydrocarbon vapour emissions from the seams 37 and preventing them from escaping to the environment;
5. The hydrocarbon vapours captured within the vapour collection chamber 34 are then directed to the charcoal canister filter 39 and subsequently sent to the engine for burning;
6. As all fuel tank components 35 are located in the vapour collection chamber 34 defined by the cover 36, they are provided with extra protection from damage during shipping of the fuel tank 30 to the assembly plant, installation of the fuel tank 30 in a motor vehicle and during impacts such as accidents, crash tests, etc.;
7. The top walls of currently used plastic fuel tanks tend to flex during negative pressure conditions inside the reservoir of the tank body. The addition of the cover 36 with its bonding at several locations on the top wall 44 provides additional stiffness to the top wall 44 of the tank body 32;
8. The vapour collection chamber 34 also provides additional fire protection to the top wall 44 and tank components 35, which are especially vulnerable during fire tests where the tank top is especially vulnerable in a fire (Fig. 5);
9. The cover 36 acts as an additional barrier to prevent fuel leaks from damaged tank components as a result of an accident, thereby increasing the motor vehicle safety; and 10. The cover 36 creates a double wall for the top portion 42 of the fuel 5 tank 30, which provides additional dampening of noise (illustrated by the arrows) created by the fuel pump 48 in the fuel tank 30 (Fig. 6).
Also provided in this invention is a method of making a multilayered fuel tank 30 for preventing the escape of hydrocarbon fuel vapour to the environment. The method generally comprises the steps o~
10 (a) providing a fuel tank body 32 for holding liquid fuel 33 and vapour comprising a top wall 44 and a number of fuel tank components 35 and seams 37 located on the top wall 44; and (b) connecting the cover 36 to the fuel tank body 32. The cover 36 defines the vapour collection chamber 34 and encapsulates the top wall 44 and the fuel tank components 35 and seams 37 thereby trapping any hydrocarbon vapours that may escape from the tank body 32, the fuel tank components 35 and the seams 37 when in use.
Further, there is also provided a method of preventing fuel hydrocarbon vapour from escaping from a fuel tank 30 to the environment. The method includes:
(a) providing a fuel tank body 32 for holding liquid fuel 33 and vapour comprising a top wall 44, and a number of fuel tank components 35 and seams 37 located on the top wall 44;
(b) connecting the cover 36 to the fuel tank body 32, the cover 36 defining a vapour collection chamber 34 and encapsulating the top wall 44 and the fuel tank components 35 and seams 37. Fuel hydrocarbon vapours are thereby trapped rather than escaping from the tank body 32, the fuel tank components 35 and the seams 37 to the environment; and (c) directing the trapped fuel hydrocarbon vapours through the charcoal cannister filter 39 to the motor vehicle engine for combustion.
Although the present invention has been shown and described with respect to its preferred embodiments, it will be understood by those skilled in the art that other changes, modifications, additions and omissions may be made without departing from the substance and the scope of the present invention as defined by the attached claims.
Claims (11)
1. A multilayered fuel tank for a motor vehicle, comprising:
(a) a fuel tank body for holding liquid and vapour fuel comprising a bottom wall, side walls and a top wall;
(b) a plurality of fuel tank components located on the top wall and seams located on the side walls; and (c) a tank cover connected to the fuel tank body and defining a vapour collection chamber, the tank cover protecting and encapsulating the top wall and the fact tank components and seams thereby trapping any fuel vapours that escape from the tank body, the fuel tank components and the seams.
(a) a fuel tank body for holding liquid and vapour fuel comprising a bottom wall, side walls and a top wall;
(b) a plurality of fuel tank components located on the top wall and seams located on the side walls; and (c) a tank cover connected to the fuel tank body and defining a vapour collection chamber, the tank cover protecting and encapsulating the top wall and the fact tank components and seams thereby trapping any fuel vapours that escape from the tank body, the fuel tank components and the seams.
2. The multilayered fuel tank of claim 1, wherein the tank cover and tank body are made of plastic material and the tank cover is bonded to the fuel tank using a bonding method selected from the group convicting of infrared contact free welding, ultrasonic welding and emabond.
3. The multilayered fuel tank of claim 1, further comprising a charcoal cannister filter in operative connection with the vapour collection chamber wherein any fuel vapour in the collection chamber is directed to and captured in the charcoal cannister filter.
4. The multilayered fuel tank of claim 3, wherein the charcoal cannister filter is also operatively connected to the motor vehicle engine such that the fuel vapour captured by the charcoal filter is then directed to the engine for combustion.
5. The multilayered fuel tank of claim 1, wherein the fuel tank components and seams comprise one or more of valves, hoses, connectors, tank body seams, and cables.
6. The multilayered fuel tank of claim 5, wherein the tank cover further provides mechanical protection for the tank components and seams during installation of the fuel tank or during a motor vehicle accident.
7. An accessory for a motor vehicle fuel tank comprising a bottom wall, side walls, a top wall, seams and a plurality of gel tank components located on the top wall, the accessory comprising:
a tank cover for connection to the fuel tank so define a vapour collection chamber, the tank cover protecting and encapsulating the top wall, the fool tank components and the seams thereby trapping any fuel vapours that may escape from the tank body, the fuel tank components and the scams during use of the fuel tank.
a tank cover for connection to the fuel tank so define a vapour collection chamber, the tank cover protecting and encapsulating the top wall, the fool tank components and the seams thereby trapping any fuel vapours that may escape from the tank body, the fuel tank components and the scams during use of the fuel tank.
8. The accessory of claim 7, wherein the fuel tank further comprises a charcoal cannister filter is operative connection with the vapour collection chamber and the motor vehicle engine wherein any fuel vapour in the collection chamber is directed to and captured in the charcoal cannister filter and then directed to the engine for combustion during operation of the motor vehicle.
9. A method of making a multilayered fuel tank far preventing the escape of fuel vapour to the environment, the method comprising:
(a) providing a fuel tank body for holding liquid fuel and vapour comprising a bottom wall, side walls and a top wall and a plurality of fuel tank components located on the top wall and seams located on the aide walls; and (b) connecting a rank cover to the fuel tank body, the tank covet defining a vapour collection chamber and protecting and encapsulating the top wall and the fuel tank components and seams thereby trapping any fuel vapours that may escape from the tank body, the fuel tank components and the seams when in use.
(a) providing a fuel tank body for holding liquid fuel and vapour comprising a bottom wall, side walls and a top wall and a plurality of fuel tank components located on the top wall and seams located on the aide walls; and (b) connecting a rank cover to the fuel tank body, the tank covet defining a vapour collection chamber and protecting and encapsulating the top wall and the fuel tank components and seams thereby trapping any fuel vapours that may escape from the tank body, the fuel tank components and the seams when in use.
10. The method of claim 9, further comprising the step of:
(a) operatively connecting a charcoal cannister filter with the vapour collection chamber and the motor vehicle engine wherein in use any fuel vapour in the collection chamber is directed to and captured in the charcoal cannister filter and then directed to the engine for combustion.
(a) operatively connecting a charcoal cannister filter with the vapour collection chamber and the motor vehicle engine wherein in use any fuel vapour in the collection chamber is directed to and captured in the charcoal cannister filter and then directed to the engine for combustion.
11. A method of preventing fuel vapour from escaping from a fuel tank for motor vehicles to the environment, comprising:
(a) providing a fuel tank body for holding liquid fuel and vapour comprising a bottom wall, side walls and a top wall, and a plurality of fuel teak components located on the top wall and seams located on the side walls;
(b) connecting a tank cover to the fuel tank body, the tank cover defining a vapour collection chamber and protecting and encapsulating the top wall and the fuel tank components and seams thereby trapping any duel vapours that may escape from the tank body, the fuel tank components and the seams; and (c) directing the trapped fuel vapours through a charcoal cannister filter to the motor vehicle engine for combustion.
(a) providing a fuel tank body for holding liquid fuel and vapour comprising a bottom wall, side walls and a top wall, and a plurality of fuel teak components located on the top wall and seams located on the side walls;
(b) connecting a tank cover to the fuel tank body, the tank cover defining a vapour collection chamber and protecting and encapsulating the top wall and the fuel tank components and seams thereby trapping any duel vapours that may escape from the tank body, the fuel tank components and the seams; and (c) directing the trapped fuel vapours through a charcoal cannister filter to the motor vehicle engine for combustion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002362821A CA2362821A1 (en) | 1999-02-18 | 2000-02-18 | Multilayer fuel tank with cover and fuel vapour collection chamber |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002262295A CA2262295A1 (en) | 1999-02-18 | 1999-02-18 | Multilayer fuel tank with integrated hydrocarbon collection chamber |
| CA2,262,295 | 1999-02-18 | ||
| CA002362821A CA2362821A1 (en) | 1999-02-18 | 2000-02-18 | Multilayer fuel tank with cover and fuel vapour collection chamber |
| PCT/CA2000/000167 WO2000048859A1 (en) | 1999-02-18 | 2000-02-18 | Multilayer fuel tank with cover and fuel vapour collection chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2362821A1 true CA2362821A1 (en) | 2000-08-24 |
Family
ID=25680823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002362821A Abandoned CA2362821A1 (en) | 1999-02-18 | 2000-02-18 | Multilayer fuel tank with cover and fuel vapour collection chamber |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2362821A1 (en) |
-
2000
- 2000-02-18 CA CA002362821A patent/CA2362821A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |