CA1109338A - Railroad tank car - Google Patents
Railroad tank carInfo
- Publication number
- CA1109338A CA1109338A CA365,449A CA365449A CA1109338A CA 1109338 A CA1109338 A CA 1109338A CA 365449 A CA365449 A CA 365449A CA 1109338 A CA1109338 A CA 1109338A
- Authority
- CA
- Canada
- Prior art keywords
- tank
- diaphragm
- ring
- lid
- man
- 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.)
- Expired
Links
Landscapes
- Pressure Vessels And Lids Thereof (AREA)
Abstract
RAILROAD TANK CAR
ABSTRACT
A flexible diaphragm can be moved to line opposite surfaces of a tank vehicle so that incompatible fluids alternately can be transported in the vehicle without the need for cleaning it. The diaphragm is prevented from entering a manway on the vehicle, and an outage gauge is confined entirely within the manway to prevent damage to the diaphragm.
ABSTRACT
A flexible diaphragm can be moved to line opposite surfaces of a tank vehicle so that incompatible fluids alternately can be transported in the vehicle without the need for cleaning it. The diaphragm is prevented from entering a manway on the vehicle, and an outage gauge is confined entirely within the manway to prevent damage to the diaphragm.
Description
,`" -- 1 E~II~R~)AD TANK CAR
This application is a division o~ Canadian patent application Serial No. 332,66~ filed July 27 r 1979, BACKG~OUND OF THE INVENTIQN
This invention relates to wheeled vehicles, and more par-ticularly to railroad -tank cars for t:ransporting differenk liquids in a given container.
When a tank truck or a railroad tank car transporting a particular gas or liquid is to be used to transport a different non-compatible fluid, it is necessary to clean the container of the vehicle. This is usually expensive and inconvenient, and the required specialized cleaning facilities frequently are not available. To solve this problem, it has been proposed that vehicles for transporting fluids be provided with a pair of separate inlets and outlets and a flexible diaphragm that alternately lines opposed sides of the vehicle's container. Movement of the diaphragm to line one side of the container provides a chamber for one fluid, and movement of the diaphragm to the opposite side of the container provides a chamber for a different non-compatible fluid. Thus, the container does not have to be cleaned to enable the vehicle to transport either of such fluids. However, there has not been any significant use of such vehicles having a diaphragm that enables them to alternately carry non~compatible fluids without being cleaned in between. One reason such vehicles have not been used has been the extensive modification of standard vehicles believed necessary to prevent damage to the diaphragm or to the vehicle container or components. For example, it is necessary that liquid transport vehicles have a specified minimum empty space or outage in their upper end. A visible gauge that projects into the vehicle tank has been used to identify the uppermost permissible liquid level in the tank. Such a gauge could not be used in a diaphragm vehicle because it could damage, or be damaged by, -the diaphragm.
.. ~ , ~,;?
This application is a division o~ Canadian patent application Serial No. 332,66~ filed July 27 r 1979, BACKG~OUND OF THE INVENTIQN
This invention relates to wheeled vehicles, and more par-ticularly to railroad -tank cars for t:ransporting differenk liquids in a given container.
When a tank truck or a railroad tank car transporting a particular gas or liquid is to be used to transport a different non-compatible fluid, it is necessary to clean the container of the vehicle. This is usually expensive and inconvenient, and the required specialized cleaning facilities frequently are not available. To solve this problem, it has been proposed that vehicles for transporting fluids be provided with a pair of separate inlets and outlets and a flexible diaphragm that alternately lines opposed sides of the vehicle's container. Movement of the diaphragm to line one side of the container provides a chamber for one fluid, and movement of the diaphragm to the opposite side of the container provides a chamber for a different non-compatible fluid. Thus, the container does not have to be cleaned to enable the vehicle to transport either of such fluids. However, there has not been any significant use of such vehicles having a diaphragm that enables them to alternately carry non~compatible fluids without being cleaned in between. One reason such vehicles have not been used has been the extensive modification of standard vehicles believed necessary to prevent damage to the diaphragm or to the vehicle container or components. For example, it is necessary that liquid transport vehicles have a specified minimum empty space or outage in their upper end. A visible gauge that projects into the vehicle tank has been used to identify the uppermost permissible liquid level in the tank. Such a gauge could not be used in a diaphragm vehicle because it could damage, or be damaged by, -the diaphragm.
.. ~ , ~,;?
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0 EC yEs OF THE I _ENTI~N
Accordingly it is an object of this invention to provide improved means for transporting non-compatible fluids.
The inven-tion comprehends in one aspect a wheeled vehicle for transporting a plurality of non-compatible liquids, which vehicle includes a container for such liquids comprisiny a generally cylindrical tank having a generally horizonkal longitudinal axis. A flexible diaphragm is in the tank and the periphery of the diaphragm contacts the wall oE the tank in a generally verkical plane which generally bisects the tank, the diaphragm alternately lying against opposite portions of the tank so as to define different chambers for such non-compatible liquids. Means are provided Eor sealing the diaphragm ayainst the wall and a separate manway is provided for each of the chamber,s. Each manway includes a generally circular open-ended ring a-ttached to the tank around a man-sized hole through the wall, the ring being located entirely outside of the vertical plane noted before. A movable lid closes the open end of the ring, the lid being pivotally attached at one end to the ring. Baffle means are attached to and movable with the pivoted lid and extends through the ring into the man-sized hole for supporting the diaphragm and thereby preventing the diaphragm from being forced through the man-sized hole by pressure in the tank.
Other aspect~ and advantages wil:L be found in the speci~ica~ions and claims, and the scope of khe invention will be polnted out in the claims.
DESCRIPTION OF l~E DRAWING
Fig. 1 is a schematic, partially br~ken-~way side view of a railroad tank car im accord with this invention.
Fig. 2 is an enlarged partial top view o the car shown in Fig. 1.
Fig. 3 is a cross sectional view taken along the line 3-3 in Fig. 2.
The drawing shows a railroad tank car 1 including a metal tank 2 for containing and transporting alternately two diferent non-compatible liquids, such as lube oil and diesel oil. Container tank 2 is generally cylindrical, and has a generally horizontal longitudinal axis; its ends are closed by dished heads 4. Tank 2 encloses a disphragm 5 made from a flexible ma~erial having its terminal edge clamped at 6 or o~herwise sealed against the inside surace of tank 2 around its entire periphery in a generally vertic~l plane which generally bisects tank 2 Iongitudinally, A pair of manways 7 and 8 are located adjacent the upper surface of tank 2 on opposite sides of its longitudinal center, and a palr of conven-tional liquid outlets 9 and 10 are located adjacent the lower surface of tank 2 on opposi~e sides o its longitudinal center. A pair of quick-flll nozzles 14 and 15 are also located ad~acen~ the upper surface of tank 2 on opposite side~ of its longitudinal center.
Nozzles 14 and 15 and manway~ 7 and 8 provide pair~ of upwardly extending liquld inle~ condu~t~, each such palr providing an inlet conduit on each side of the plane of the edge of diaphrag~ 5. Car 1 should be provided with ~ 3 other necessary conventional components and accessories, such as trucks, draft gear, ladders and platforms, which do not form part of the present invention.
When tank 2 ls filled with a speci~ic liquid through nozzle 14 or manway 7, diaphragm 5 will lie against the inside wall surface of tank 2 and define a chamber for 6uch liquid; such liquid would be drained through outlet 9. When ~ank 2 is filled wi~h a non-compatible liquid through nozzle lS or manway 8, diaphragm 5 will be against the inside wall surface of tank 2 and define a different chamber ~or the non-compatible liquid; th~s liquid would ~e drained through outlet 10. The separa~e chambers for non-compatible liquids are hermetically isolated, so it is not necessary to clean tank 2 whenever car 1 carries either of such liquids.
Each manwa~ 7 and 8 is made from an upstanding open-ended cyllndrical ring 17 welded to the upper portion of tank 2 around a man-sized hole 18 through the tank. The rings 17 are located outside of and on opposite sides of the plane of the terminal edge of diaphragm 5.
A manway couer or lid 20 is pivotally attached to each ring 17 by a hinge 21 f~r closlng the upper open end of the ring. Each lid 20 includes a vacuum relief valve 22 and an air connection 23 of conventional design. Lids 2s 20 may be sealed against the top of rings 17 by nuts 25 threaded on to six bolts 26 attached to hinges 27 on rings 17 and pivotable in conventional manner into slots 28 in lids 20. Coventional pressure relief valves 29 are u~ted on tank 2 adjacent the ~erminal edges 30 of diaphragm 5.
Man-sized hole 18 def~nes a relatively large area (e.g. two sq. ft.) in which the inside wall o~ tank 2 cannot support diaphragm 5. Substantial gas or 1iquid pressures may occur in ~cank 2 which could force diaphragm ~J ~
5 ~ D~3?3~
5 through hole 18; this could force diaphragm 5 against components in one of the manways or against the edge of a hole 18 with sufficient force to cut or tear the diaphragm. Baf1e means such as plate 30 is shaped to conform to the urvature of the wall of tank 2. When lid 20 is closed, baffle plate 30 is located in hole 18 so as to define essentiall.y a continuation of the inside surface of the tank wall that provides means for supporting diaphragm 5 and thereby prevPnting the diaphragm from being forced through hole 18 by pressure ln the tank. A cylindrical tubular member 31 extends through rlng 17 and ha~ its upper end 32 attached to the under-side of lid 20. The lower end 33 of tubular member 31 is attached to the center portion of baffle 30. One or more vent holes 35 are provided in tube 31 at end 33 to permit drainage of liquid or condensation. The annular space 36 separating the edge of ba1e 30 rom the edge of hole 18 is sufficient to permit lid 20 to swing open without ba~fle 30 binding against ring 17 but is insufficient to permit diaphragm 5 to enter hole 18.
The vertically lowermost portion or edge 37 of each ring 17 is spaced below the top surface o t~nk 2 a predetermined vertical dis~ance (e.g. four inches) sufficient to define adequate outage space in the top of the chamber on each side of diaphragm 5 for the liquid tank 2. An outage sight gauge 38 is located entirely within each ring 17 adjacent edge 37. Gauge 38 may be a brightly colored metal bar or other object that is visible in a manway when in contact with a liquid, and no part o gauge 38 need project below hole 18. Baffle 30 prevents diaphragm 5 from en~ering hole 18, so the diaphragm cannot contact gauge 38.
When the chamber defined by one side of diaphragm 5 is filled with liquid, it is necessary that the chamber defined by the other side of the diaphragm be vented to , f the atmosphere. This permits escape of air or vapor - 6 ~ 3 from the vented chamber as diaphragm 5 moves agains~
the inside wall surace o~ tank 2 that had previously deined such ven~ed chamber. Each of manways 7 and 8 may have a vent line 39 connecting a vent port 40 on the inside o~ its rin~ 17 to a vertical vent pipe at 41.
Thus, the ch~mbers on both sides of diaphragm 5 may be vented to the atmosphere whenever either chamber is filled through a manway.
I~ has thus been shown that by the prac~ice of this invention extensive modificatLon o a rallroad tank car 1 is not necessary to permdt use of a flexible diaphragm 5 for providing separate chambers for non-compatible ~luids. A baffle plate 30 in each of manways 7 and 8 prevents excess pressure or pressure surges from orcing the diaphragm through hole 18, and the location of the lower edge 37 of eacb manway far enough below ~he top surface of tank 2 permits the ou~age sight gauge 38 to be confined entirely within each ring 17 where the diaphragm cannot ~ouch them.
While the present invention has been described with reference to a particular embodiment, it is not intended to illustrate or describe herein all of the equivalent forms or ramifications thereof. Also, the words used are words of description rather than limitation, and various changes may be made without departing from the spirit or scope of the invention disclosed herein. It is intended that the appended claims cover all such changes as all within the true spirit and scope o the invention.
~, ~
0 EC yEs OF THE I _ENTI~N
Accordingly it is an object of this invention to provide improved means for transporting non-compatible fluids.
The inven-tion comprehends in one aspect a wheeled vehicle for transporting a plurality of non-compatible liquids, which vehicle includes a container for such liquids comprisiny a generally cylindrical tank having a generally horizonkal longitudinal axis. A flexible diaphragm is in the tank and the periphery of the diaphragm contacts the wall oE the tank in a generally verkical plane which generally bisects the tank, the diaphragm alternately lying against opposite portions of the tank so as to define different chambers for such non-compatible liquids. Means are provided Eor sealing the diaphragm ayainst the wall and a separate manway is provided for each of the chamber,s. Each manway includes a generally circular open-ended ring a-ttached to the tank around a man-sized hole through the wall, the ring being located entirely outside of the vertical plane noted before. A movable lid closes the open end of the ring, the lid being pivotally attached at one end to the ring. Baffle means are attached to and movable with the pivoted lid and extends through the ring into the man-sized hole for supporting the diaphragm and thereby preventing the diaphragm from being forced through the man-sized hole by pressure in the tank.
Other aspect~ and advantages wil:L be found in the speci~ica~ions and claims, and the scope of khe invention will be polnted out in the claims.
DESCRIPTION OF l~E DRAWING
Fig. 1 is a schematic, partially br~ken-~way side view of a railroad tank car im accord with this invention.
Fig. 2 is an enlarged partial top view o the car shown in Fig. 1.
Fig. 3 is a cross sectional view taken along the line 3-3 in Fig. 2.
The drawing shows a railroad tank car 1 including a metal tank 2 for containing and transporting alternately two diferent non-compatible liquids, such as lube oil and diesel oil. Container tank 2 is generally cylindrical, and has a generally horizontal longitudinal axis; its ends are closed by dished heads 4. Tank 2 encloses a disphragm 5 made from a flexible ma~erial having its terminal edge clamped at 6 or o~herwise sealed against the inside surace of tank 2 around its entire periphery in a generally vertic~l plane which generally bisects tank 2 Iongitudinally, A pair of manways 7 and 8 are located adjacent the upper surface of tank 2 on opposite sides of its longitudinal center, and a palr of conven-tional liquid outlets 9 and 10 are located adjacent the lower surface of tank 2 on opposi~e sides o its longitudinal center. A pair of quick-flll nozzles 14 and 15 are also located ad~acen~ the upper surface of tank 2 on opposite side~ of its longitudinal center.
Nozzles 14 and 15 and manway~ 7 and 8 provide pair~ of upwardly extending liquld inle~ condu~t~, each such palr providing an inlet conduit on each side of the plane of the edge of diaphrag~ 5. Car 1 should be provided with ~ 3 other necessary conventional components and accessories, such as trucks, draft gear, ladders and platforms, which do not form part of the present invention.
When tank 2 ls filled with a speci~ic liquid through nozzle 14 or manway 7, diaphragm 5 will lie against the inside wall surface of tank 2 and define a chamber for 6uch liquid; such liquid would be drained through outlet 9. When ~ank 2 is filled wi~h a non-compatible liquid through nozzle lS or manway 8, diaphragm 5 will be against the inside wall surface of tank 2 and define a different chamber ~or the non-compatible liquid; th~s liquid would ~e drained through outlet 10. The separa~e chambers for non-compatible liquids are hermetically isolated, so it is not necessary to clean tank 2 whenever car 1 carries either of such liquids.
Each manwa~ 7 and 8 is made from an upstanding open-ended cyllndrical ring 17 welded to the upper portion of tank 2 around a man-sized hole 18 through the tank. The rings 17 are located outside of and on opposite sides of the plane of the terminal edge of diaphragm 5.
A manway couer or lid 20 is pivotally attached to each ring 17 by a hinge 21 f~r closlng the upper open end of the ring. Each lid 20 includes a vacuum relief valve 22 and an air connection 23 of conventional design. Lids 2s 20 may be sealed against the top of rings 17 by nuts 25 threaded on to six bolts 26 attached to hinges 27 on rings 17 and pivotable in conventional manner into slots 28 in lids 20. Coventional pressure relief valves 29 are u~ted on tank 2 adjacent the ~erminal edges 30 of diaphragm 5.
Man-sized hole 18 def~nes a relatively large area (e.g. two sq. ft.) in which the inside wall o~ tank 2 cannot support diaphragm 5. Substantial gas or 1iquid pressures may occur in ~cank 2 which could force diaphragm ~J ~
5 ~ D~3?3~
5 through hole 18; this could force diaphragm 5 against components in one of the manways or against the edge of a hole 18 with sufficient force to cut or tear the diaphragm. Baf1e means such as plate 30 is shaped to conform to the urvature of the wall of tank 2. When lid 20 is closed, baffle plate 30 is located in hole 18 so as to define essentiall.y a continuation of the inside surface of the tank wall that provides means for supporting diaphragm 5 and thereby prevPnting the diaphragm from being forced through hole 18 by pressure ln the tank. A cylindrical tubular member 31 extends through rlng 17 and ha~ its upper end 32 attached to the under-side of lid 20. The lower end 33 of tubular member 31 is attached to the center portion of baffle 30. One or more vent holes 35 are provided in tube 31 at end 33 to permit drainage of liquid or condensation. The annular space 36 separating the edge of ba1e 30 rom the edge of hole 18 is sufficient to permit lid 20 to swing open without ba~fle 30 binding against ring 17 but is insufficient to permit diaphragm 5 to enter hole 18.
The vertically lowermost portion or edge 37 of each ring 17 is spaced below the top surface o t~nk 2 a predetermined vertical dis~ance (e.g. four inches) sufficient to define adequate outage space in the top of the chamber on each side of diaphragm 5 for the liquid tank 2. An outage sight gauge 38 is located entirely within each ring 17 adjacent edge 37. Gauge 38 may be a brightly colored metal bar or other object that is visible in a manway when in contact with a liquid, and no part o gauge 38 need project below hole 18. Baffle 30 prevents diaphragm 5 from en~ering hole 18, so the diaphragm cannot contact gauge 38.
When the chamber defined by one side of diaphragm 5 is filled with liquid, it is necessary that the chamber defined by the other side of the diaphragm be vented to , f the atmosphere. This permits escape of air or vapor - 6 ~ 3 from the vented chamber as diaphragm 5 moves agains~
the inside wall surace o~ tank 2 that had previously deined such ven~ed chamber. Each of manways 7 and 8 may have a vent line 39 connecting a vent port 40 on the inside o~ its rin~ 17 to a vertical vent pipe at 41.
Thus, the ch~mbers on both sides of diaphragm 5 may be vented to the atmosphere whenever either chamber is filled through a manway.
I~ has thus been shown that by the prac~ice of this invention extensive modificatLon o a rallroad tank car 1 is not necessary to permdt use of a flexible diaphragm 5 for providing separate chambers for non-compatible ~luids. A baffle plate 30 in each of manways 7 and 8 prevents excess pressure or pressure surges from orcing the diaphragm through hole 18, and the location of the lower edge 37 of eacb manway far enough below ~he top surface of tank 2 permits the ou~age sight gauge 38 to be confined entirely within each ring 17 where the diaphragm cannot ~ouch them.
While the present invention has been described with reference to a particular embodiment, it is not intended to illustrate or describe herein all of the equivalent forms or ramifications thereof. Also, the words used are words of description rather than limitation, and various changes may be made without departing from the spirit or scope of the invention disclosed herein. It is intended that the appended claims cover all such changes as all within the true spirit and scope o the invention.
~, ~
Claims (9)
1. A wheeled vehicle for transporting a plurality of non-compatible liquids, comprising:
A. a container for such liquids comprising a generally cylindrical tank having a generally horizontal longitudinal axis;
B. a flexible diaphragm in said tank, the periphery of said diaphragm contacting the wall of said tank in a generally vertical plane which generally bisects said tank, said diaphragm alternately lying against opposite portions of said tank so as to define different chambers for such non-compatible liquids;
C. means for sealing said diaphragm against said wall; and D. a separate manway for each of said chambers, each manwy comprising:
1. a generally circular open-ended ring attached to said tank around a man-sized hole through said wall, salt ring being located entirely outside of said plane, 2. a movable lid closing said open end of said ring, said lid being pivotally attached at one end to said ring; and 3. baffle means attached to and movable with said pivoted lid and extending through said ring into said man-sized hole for supporting said diaphragm and thereby preventing said diaphragm from being forced through said man-sized hole by pressure in said tank.
2. The invention defined in claim 1, wherein said baffle means is located in said man-sized hole and has its edge separated from the edge of said man-sized hole by an annular space sufficient to permit said lid to pivot open without causing said baffle means to bind against said ring, and said annular space being insufficient to permit said diaphragm to enter said man-sized hole.
3. The invention defined in claim 2, wherein said baffle means comprises a plate shaped to conform to the curvature of said tank wall, said baffle plate being located in said hole to define essentially a continuation of the inside surface of said tank wall when said lid is closed.
4. The invention defined in claim 2, wherein said baffle means is attached to said lid by a tubular member extending through said ring.
5. The invention defined in claim 4, wherein the upper end of said tubular member is attached to the under-side of said lid, and the lower end of said tubular member is attached to the center portion of said baffle means.
6. The invention defined in claim 5, wherein said tubular member has a vent hole adjacent its lower most edge for drainage of liquid and condensation from the inside of said tubular member into said container.
7. The invention defined in claim 6, further comprising an outage gauge located entirely within said ring adjacent the lowest portion of said ring, said gauge being visible from said manway when in contact with said liquid without ever being contacted by said diaphragm.
8. A railroad tank car for transporting a plurality of non-compatible liquids, comprising:
A. a container for such liquids comprising a generally cylindrical tank having a generally horizontal longitudinal axis;
B. a flexible diaphragm in said tank, the periphery of said diaphragm contacting the wall of said tank in a generally vertical plane which generally bisects said tank, said diaphragm alternately lying against opposite portions of said tank so as to define different chambers for such non-compatible liquids;
C. means for sealing said diaphragm against said wall; and D a separate manway for each of said chambers, each manway comprising:
1. a cylindrical open-ended ring attached to said tank around a man-sized hole through said wall, said ring being located entirely outside of said plane;
2. a lid pivotably attached to said ring for closing said open end of said ring;
and 3. means in said man-sized hole for supporting said diaphragm and thereby preventing said diaphragm from being forced through said man-sized hole by pressure in said tank comprising:
a. a cylindrical tube extending through said ring and having one end attached to the center portion of the under-side of said lid;
b. a baffle plate attached to the other end of said tube and occupying said hole when said lid is closed, said baffle plate being shaped to conform to the curvature of said tank wall and defining essentially a contin-uation of the inside surface of said tank wall, there being an annular space separating the edge of said baffle plate from the edge of said man-sized hole, said annular space being sufficient to permit said lid to pivot open without causing said baffle plate to bind against said ring, and said annular space being insufficient to permit said diaphragm to enter said man-sized hole.
A. a container for such liquids comprising a generally cylindrical tank having a generally horizontal longitudinal axis;
B. a flexible diaphragm in said tank, the periphery of said diaphragm contacting the wall of said tank in a generally vertical plane which generally bisects said tank, said diaphragm alternately lying against opposite portions of said tank so as to define different chambers for such non-compatible liquids;
C. means for sealing said diaphragm against said wall; and D a separate manway for each of said chambers, each manway comprising:
1. a cylindrical open-ended ring attached to said tank around a man-sized hole through said wall, said ring being located entirely outside of said plane;
2. a lid pivotably attached to said ring for closing said open end of said ring;
and 3. means in said man-sized hole for supporting said diaphragm and thereby preventing said diaphragm from being forced through said man-sized hole by pressure in said tank comprising:
a. a cylindrical tube extending through said ring and having one end attached to the center portion of the under-side of said lid;
b. a baffle plate attached to the other end of said tube and occupying said hole when said lid is closed, said baffle plate being shaped to conform to the curvature of said tank wall and defining essentially a contin-uation of the inside surface of said tank wall, there being an annular space separating the edge of said baffle plate from the edge of said man-sized hole, said annular space being sufficient to permit said lid to pivot open without causing said baffle plate to bind against said ring, and said annular space being insufficient to permit said diaphragm to enter said man-sized hole.
9. The invention defined in claim 8, further comprising an outage gauge located in said annular space between said baffle plate and the lowest portion of said ring entirely within said ring, said gauge being visible from said manway when in contact with said liquid without ever being contacted by said diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA365,449A CA1109338A (en) | 1978-08-10 | 1980-11-25 | Railroad tank car |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US932,817 | 1978-08-10 | ||
| US05/932,817 US4210254A (en) | 1978-08-10 | 1978-08-10 | Railroad tank car |
| CA332,664A CA1109337A (en) | 1978-08-10 | 1979-07-27 | Railroad tank car |
| US06/116,337 US4318348A (en) | 1978-08-10 | 1980-01-28 | Railroad tank car |
| US116,337 | 1980-01-28 | ||
| CA365,449A CA1109338A (en) | 1978-08-10 | 1980-11-25 | Railroad tank car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1109338A true CA1109338A (en) | 1981-09-22 |
Family
ID=27426171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA365,449A Expired CA1109338A (en) | 1978-08-10 | 1980-11-25 | Railroad tank car |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1109338A (en) |
-
1980
- 1980-11-25 CA CA365,449A patent/CA1109338A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |