EP1456525A1 - Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine - Google Patents
Kraftstoffeinspritzeinrichtung für eine brennkraftmaschineInfo
- Publication number
- EP1456525A1 EP1456525A1 EP02805245A EP02805245A EP1456525A1 EP 1456525 A1 EP1456525 A1 EP 1456525A1 EP 02805245 A EP02805245 A EP 02805245A EP 02805245 A EP02805245 A EP 02805245A EP 1456525 A1 EP1456525 A1 EP 1456525A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- injection valve
- chamber
- fuel
- fuel injection
- 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.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims abstract description 106
- 239000007924 injection Substances 0.000 title claims abstract description 106
- 239000000446 fuel Substances 0.000 title claims abstract description 81
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/28—Details of throttles in fuel-injection apparatus
Definitions
- the invention is based on one
- Fuel injection device for an internal combustion engine according to the preamble of claim 1.
- Such a fuel injection device is known from EP 0 987 431 A2.
- This fuel injection device has a high-pressure fuel pump and a fuel injection valve connected to it for each cylinder of the internal combustion engine.
- the high-pressure fuel pump has a pump piston which is driven by the internal combustion engine in a stroke movement and delimits a pump working space.
- the fuel injection valve has a pressure chamber connected to the pump working chamber and an injection valve member, through which at least one injection opening is controlled and which, when acted upon by the pressure in the pressure chamber, can be moved in the opening direction to release the at least one injection opening, against a closing force.
- a first electrically operated control valve is provided, by means of which a connection of the pump work space to a relief space is controlled.
- a second electrically actuated control valve is also provided, by means of which a connection of a control pressure chamber to a relief chamber is controlled.
- the control pressure chamber is connected to the pump work chamber via a throttling point.
- the control pressure chamber is delimited by a control piston, which is supported on the injection valve member in its closing direction and by the one prevailing in the control pressure chamber Pressure is applied in the closing direction of the injection valve member.
- the first control valve is closed and the second control valve is opened, so that no high pressure can build up in the control pressure chamber and the fuel injection valve can open.
- the second control valve is open, however, fuel flows out of the pump work chamber via the control pressure chamber, so that the quantity of fuel available for injection is reduced from the quantity of fuel delivered by the pump piston, and the pressure available for injection is also reduced. It follows that the efficiency of the
- Fuel injection device is not optimal and the course of the fuel injection can not be set in the desired manner.
- the fuel injection device according to the invention with the features according to claim 1 has the advantage that only a small flow cross-section is released from the control pressure chamber to the relief chamber when the second control valve is open for fuel injection and thus open and thus only a small amount of fuel flows out, so that the fuel is available for injection standing pressure and the efficiency of the fuel injector is increased.
- a rapid opening or closing of the fuel injection valve is also achieved, which is made possible by a rapid pressure reduction or pressure build-up in the control pressure chamber that occurs as a result of the variable flow cross section controlled by the control piston when the second control valve is opened or closed.
- Advantageous refinements and developments of the fuel injection device according to the invention are specified in the dependent claims.
- the embodiment according to claim 2 enables the flow cross-section to be controlled in a simple manner.
- FIG. 2 shows a detail designated II in FIG. 1 in an enlarged representation with a control piston in a first stroke position
- FIG. 3 shows detail II with the control piston in a second stroke position.
- the internal combustion engine is preferably a self-igniting internal combustion engine.
- the fuel injection device is preferably designed as a so-called pump-nozzle unit and has for each cylinder of the internal combustion engine a high-pressure fuel pump 10 and a fuel injection valve 12 connected to it, which form a common structural unit.
- the fuel injection device is preferably designed as a so-called pump-nozzle unit and has for each cylinder of the internal combustion engine a high-pressure fuel pump 10 and a fuel injection valve 12 connected to it, which form a common structural unit.
- Fuel injection device can also be designed as a so-called pump-line-nozzle system, in which the high-pressure fuel pump and the fuel injection valve of each cylinder are arranged separately from one another and are connected to one another via a line.
- the high-pressure fuel pump 10 has a pump body 14 a cylinder bore 16, in which a pump piston 18 is tightly guided, which is driven at least indirectly by a cam 20 of a camshaft of the internal combustion engine against the force of a return spring 19 in a lifting movement.
- the pump piston 18 delimits a pump working chamber 22 in the cylinder bore 16, in which fuel is compressed under high pressure during the delivery stroke of the pump piston 18.
- the pump working chamber 22 is supplied with fuel from a fuel tank 24 of the motor vehicle.
- the fuel injection valve 12 has a valve body 26 which is connected to the pump body 14 and which can be constructed in several parts and in which an injection valve member 28 is guided so as to be longitudinally displaceable in a bore 30.
- the valve body 26 has at least one, preferably a plurality of injection openings 32 at its end region facing the combustion chamber of the cylinder of the internal combustion engine.
- the injection valve member 28 has at its end region facing the combustion chamber an, for example, approximately conical sealing surface 34 which interacts with a valve seat 36 formed in the valve body 26 in its end region facing the combustion chamber, from or after which the injection openings 32 lead away.
- valve body 26 there is an annular space 38 between the injection valve member 28 and the bore 30 towards the valve seat 36, which in its end region facing away from the valve seat 36 merges into a pressure space 40 surrounding the injection valve member 28 by a radial expansion of the bore 30.
- the injection valve member 28 has a pressure shoulder 42 at the level of the pressure chamber 40 by reducing the cross section.
- a prestressed closing spring 44 engages, for example via a sleeve 48 which the injection valve member 28 is pressed in its closing direction towards the valve seat 36.
- the closing spring 44 is arranged in a spring chamber 46 of a housing part 50 which adjoins the valve body 26.
- the spring chamber 46 is formed by a bore in the housing part 50 which is coaxial with the bore 30 in the valve body 26.
- a shim 49 can be arranged within the sleeve 48, which enables an exact adjustment of the length of the composite consisting of the injection valve member 28 and the control piston 60 by using a disk 49 with the required thickness.
- the closing spring 44 surrounds the piston rod 61 and is supported on the one hand on the sleeve 48, and thus indirectly on the injection valve member 28, and on the other hand on a spring plate 64 resting on the annular shoulder formed at the transition from the spring chamber bore 46 to the smaller control pressure chamber bore 62.
- An intermediate disk 54 is arranged between the housing part 50 and the pump body 14.
- a channel 70 leads from the pump work chamber 22 through the pump body 14, the intermediate disk 54, the housing part 50 and the valve body 26 to the pressure chamber 40 of the fuel injector 12.
- a channel 72 leads through the intermediate disk 54 and the housing part 50 to the control pressure chamber 62
- Channel 72 has a first throttle point in the form of a throttle bore 73 in the housing part 50.
- a channel 74 also opens into the control pressure chamber 62, which forms a connection to a relief chamber, which can serve at least indirectly as the fuel reservoir 24 or another area in which a low pressure prevails.
- a connection 76 leads from the pump work chamber 22 or from the channel 70 to a relief chamber 24, which is controlled by a first electrically operated control valve 78.
- the control valve 78 can, as shown in FIG. 1, be designed as a 2/2-way valve.
- the connection 74 of the control pressure chamber 62 to the relief chamber 24 is controlled by a second electrically operated control valve 80, which can be designed as a 2/2-way valve.
- the control valves 78, 80 can have an electromagnetic actuator or a piezo actuator and are controlled by an electronic control device 82.
- the bore 52 has a radial widening in its end region to form the control pressure chamber 62.
- the channel 72 opens into the control pressure chamber 62 in an edge region offset to the longitudinal axis 59 of the control piston 60.
- the channel 74 preferably opens into the control pressure chamber 62 coaxially with the longitudinal axis 59 of the control piston 60 and in the channel 74 a second throttle point in the form of a throttle bore 75 is arranged.
- the throttle bore 75 is arranged at a distance from the mouth of the channel 74 into the control pressure chamber 62 in the housing part 50.
- the mouth 56 of the channel 74 in the control pressure chamber 62 is designed in such a way that the cross section of the channel 74 increases towards the control pressure chamber 62, it being possible for the mouth 56 to be conically widening, for example.
- the control piston 60 has at its end facing away from the injection valve member 28 a pin 66 which is arranged coaxially with its longitudinal axis 59 and protrudes towards the channel 74 and which is adapted in cross-section to the mouth 56, for example smaller than the area of the control piston 60 guided in the bore 52 ,
- the pin 66 is designed in such a way that it tapers towards the channel 74, the pin 66, for example, being conically tapered.
- the control piston 60 interacts with its pin 66 with the mouth 56 of the channel 74 for controlling a flow cross-section from the control pressure chamber 62 into the channel 74 and through this with the second control valve 80 open to the relief chamber 24. If the control piston 60 is in a stroke position according to FIG. 2, in which it is arranged with its pin 66 at a large distance from the mouth 56 of the channel 74, then a large flow cross-section becomes from the control pressure chamber 62 between the pin 66 and the mouth 56 released into channel 74.
- the smallest flow cross-section for the outflow of fuel from the control pressure chamber 62 is the throttle bore 75 in the housing part 50, which has a defined fixed flow cross-section.
- the control piston 60 is in this stroke position when the fuel injection valve 12 is closed and its injection valve member 28 bears with its sealing surface 34 on the valve seat 36.
- the control piston 60 moves with its pin 66 towards the mouth 56 of the channel 74 in a lifting movement, the released flow cross section becomes smaller. If the control piston 60 according to Figure 3 with its pin 66 only a short distance is arranged to the mouth 56 of the channel 74, only a flow cross-section is released, which is less than the flow cross-section of the throttle point 75, so that the flow cross-section between the pin 66 and the mouth 56 represents the actual Drossseistelle for fuel flowing out of the control pressure chamber 62.
- the control piston 60 is in this stroke position when the fuel injection valve 12 is open and the injection valve member 28 of its sealing surface 34 is lifted off the valve seat 36.
- Fuel injector explained. During the suction stroke of the pump piston 18, fuel is supplied to it from the fuel reservoir 24. During the delivery stroke of the pump piston 18, the fuel injection begins with a pre-injection, the first control valve 78 being closed by the control device 82, so that the pump working chamber 22 is separated from the relief chamber 24.
- the second control valve 80 can initially be closed, so that the control pressure chamber 62 is separated from the relief chamber 24 and the same pressure prevails in the pump work chamber 22, so that no fuel injection can take place.
- the control device 72 then opens the second control valve 80, so that the control pressure chamber 62 is connected to the relief chamber 24. In this case, no high pressure can build up in the control pressure chamber 62, since this is relieved towards the relief chamber 24.
- the control device closes the second control valve 80, so that the control pressure chamber 62 is separated from the relief chamber 24.
- the first control valve 78 remains in its closed position. High pressure builds up in the control pressure chamber 62 as in the pump work chamber 22, so that a large pressure force acts on the control piston 60 in the closing direction and the injection valve member 28 is moved into its closed position.
- the control piston 60 then assumes its stroke position according to FIG. 3.
- the second control valve 80 is opened by the control device 82.
- the fuel injection valve 12 then opens due to the reduced pressure force on the control piston 60 and the injection valve member 28 moves over its maximum opening stroke into its opening position.
- the injection valve member 28 opens, the flow cross-section of the throttle bore 75 is effective as the smallest flow cross-section, since a large flow cross-section is released between the pin 66 of the control piston 60 and the mouth 56 of the channel 74.
- the fuel injection valve 12 opens quickly enables because the throttle bore 75 can be formed with a relatively large flow cross-section.
- the pin 66 of the control piston 60 is arranged at a short distance from the mouth 56 of the channel 74, so that only a small flow cross-section is released, which is smaller than the flow cross-section of the throttle bore 75.
- the control piston 60 remains in a state of equilibrium with its pin 66 at a distance from the mouth 56 of the channel 74, since the pin 66 coming into contact with the mouth 56 would completely separate the control pressure chamber 62 from the relief chamber 24, so that the pressure in the control pressure chamber 62 would increase, which in turn would have the consequence that the injection valve member 28 would move in the closing direction and the control piston 60 with its pin 66 would move away from the mouth 56.
- the second control valve 80 is brought into its closed switching position by the control device 82, so that the control pressure chamber 62 is separated from the relief chamber 24 and builds up in this high pressure and the fuel injection valve 12 is closed via the force acting on the control piston 60.
- the control piston 60 releases a large flow cross-section between its pin 66 and the mouth 56, so that the pressure in the control pressure chamber 62 rises quickly and onto the control piston 60 a high pressure force acts, so that the fuel injection valve 12 closes quickly.
- the second control valve 80 is opened again by the control device 82, so that the fuel injection valve 12 opens as a result of the reduced pressure in the control pressure chamber 62.
- the second control valve 80 is closed and / or the first control valve 78 is opened.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10160264 | 2001-12-07 | ||
DE10160264A DE10160264A1 (de) | 2001-12-07 | 2001-12-07 | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
PCT/DE2002/004139 WO2003054375A1 (de) | 2001-12-07 | 2002-11-12 | Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1456525A1 true EP1456525A1 (de) | 2004-09-15 |
EP1456525B1 EP1456525B1 (de) | 2005-11-16 |
Family
ID=7708453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02805245A Expired - Lifetime EP1456525B1 (de) | 2001-12-07 | 2002-11-12 | Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US6953157B2 (de) |
EP (1) | EP1456525B1 (de) |
JP (1) | JP2005513332A (de) |
DE (2) | DE10160264A1 (de) |
PL (1) | PL367446A1 (de) |
WO (1) | WO2003054375A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10259950A1 (de) * | 2002-12-20 | 2004-07-01 | Robert Bosch Gmbh | Steuerventil für Injektoren, insbesondere Common-Rail-Injektoren von Brennkraftmaschinen |
DE10352504A1 (de) * | 2003-11-11 | 2005-06-02 | Robert Bosch Gmbh | Einspritzdüse |
DE102004010759A1 (de) * | 2004-03-05 | 2005-09-22 | Robert Bosch Gmbh | Common-Rail Injektor |
DE102005014180A1 (de) * | 2005-03-29 | 2006-10-05 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
FI122557B (fi) * | 2009-04-02 | 2012-03-30 | Waertsilae Finland Oy | Mäntämoottorin polttoaineenruiskutusjärjestely |
JP6015398B2 (ja) * | 2012-12-05 | 2016-10-26 | 株式会社日本自動車部品総合研究所 | 燃料噴射弁 |
DE102014225412A1 (de) * | 2014-12-10 | 2016-06-16 | Robert Bosch Gmbh | Kolbenpumpe mit einem Kolben mit profilierter Kolbenvorderseite |
US11028810B2 (en) | 2016-11-22 | 2021-06-08 | Cummins, Inc. | Injector method of switching between injection state and drain state |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3900762A1 (de) * | 1989-01-12 | 1990-07-19 | Voest Alpine Automotive | Kraftstoffeinspritzduese mit hohlem ausweichkolben |
DE19624001A1 (de) * | 1996-06-15 | 1997-12-18 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19743669A1 (de) * | 1997-10-02 | 1999-04-08 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
GB9820237D0 (en) | 1998-09-18 | 1998-11-11 | Lucas Ind Plc | Fuel injector |
DE19939445A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Injektor |
DE10006111A1 (de) * | 2000-02-11 | 2001-08-30 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
-
2001
- 2001-12-07 DE DE10160264A patent/DE10160264A1/de not_active Withdrawn
-
2002
- 2002-11-12 PL PL02367446A patent/PL367446A1/xx unknown
- 2002-11-12 WO PCT/DE2002/004139 patent/WO2003054375A1/de active IP Right Grant
- 2002-11-12 JP JP2003555061A patent/JP2005513332A/ja active Pending
- 2002-11-12 EP EP02805245A patent/EP1456525B1/de not_active Expired - Lifetime
- 2002-11-12 US US10/470,350 patent/US6953157B2/en not_active Expired - Fee Related
- 2002-11-12 DE DE50204980T patent/DE50204980D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03054375A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10160264A1 (de) | 2003-06-18 |
WO2003054375A1 (de) | 2003-07-03 |
JP2005513332A (ja) | 2005-05-12 |
US6953157B2 (en) | 2005-10-11 |
US20040065751A1 (en) | 2004-04-08 |
DE50204980D1 (de) | 2005-12-22 |
EP1456525B1 (de) | 2005-11-16 |
PL367446A1 (en) | 2005-02-21 |
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