CA1315175C - Automatic fluid flow shut-off device - Google Patents
Automatic fluid flow shut-off deviceInfo
- Publication number
- CA1315175C CA1315175C CA000608922A CA608922A CA1315175C CA 1315175 C CA1315175 C CA 1315175C CA 000608922 A CA000608922 A CA 000608922A CA 608922 A CA608922 A CA 608922A CA 1315175 C CA1315175 C CA 1315175C
- Authority
- CA
- Canada
- Prior art keywords
- outlet
- fluid flow
- chamber
- ball
- flow shut
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
- F16K17/366—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position the closure member being a movable ball
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
- F17C13/123—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for gas bottles, cylinders or reservoirs for tank vehicles or for railway tank wagons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
- F17C2205/0326—Valves electrically actuated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
- F17C2205/0332—Safety valves or pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0338—Pressure regulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0382—Constructional details of valves, regulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0388—Arrangement of valves, regulators, filters
- F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/043—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/06—Controlling or regulating of parameters as output values
- F17C2250/0605—Parameters
- F17C2250/0636—Flow or movement of content
Abstract
ABSTRACT
A gas shut-off device 10 for a gas cylinder, to stop gas flow from the cylinder if the gas flow becomes excessively high, or the device is tilted from its normal orientation. The device 10 includes a cylindrical chamber 21 having a gas inlet 20 and a gas outlet 25, with a ball 22 located within the chamber 21 to close the outlet 25 if the gas flow becomes excessively high or the device 10 becomes tilted.
A gas shut-off device 10 for a gas cylinder, to stop gas flow from the cylinder if the gas flow becomes excessively high, or the device is tilted from its normal orientation. The device 10 includes a cylindrical chamber 21 having a gas inlet 20 and a gas outlet 25, with a ball 22 located within the chamber 21 to close the outlet 25 if the gas flow becomes excessively high or the device 10 becomes tilted.
Description
1 3 ~
Background of the Inven~ion The present invention relates to fluid flow shut-off devices and in particular to an emergency, automatic shut-off device for gas cylinder operation.
Discussion of Prior Art An automatic fluid flow shut-off device is known in which a ball moves into engagement with a seat to prevent gas flow in emergencies. However, it can not be guaranteed that the device will operate in all circumstances, particularly if the device is incorrectly oriented relative to the horizontal.
German Specification 2249598 describes a ball valve which is operated if the gas flow becomes excessive. The valve is intended to be operated so that the valve is accelerated upwardly against the force of gravity when the gas flow becomes excessive.
There is no consideration given to providing this valve with a shut-off function if it becomes incorrectly oriented. Still further, the various embodiments of this particular device shown and dlscussed, do not lend themselves to actuation if the device is merely tilted.
Objects and Summary of the Invention It is the object of the present invention to overcome or substantially ameliorate the above disadvantage.
There is disclosed herein a fluid flow shut-off device comprising:
a hollow body having an inlet connection portion to be connected to a supply of fluid under pressure, and an outlet connection portion to be connected to an apparatus to receive said fluid, said body providing a chamber through which the fluid passes from a chamber inlet to a chamber outlet, said inlet and outlet being positioned so that fluid entering said chamber enters in a direction having a direction component normal to the , 1 ~ 3~ ~7 ~ ~
direction of the fluid entering said outlet, w~th said outlet being positioned at an upper portion of said chamber whell said device is in its norma7 operating orientation having said inlet generally horizontally fac~ng;
a movable valve ball captively located within said chamber to selectively engage said outlet to prevent fluid flow therethrough, wherein said ball will engage said outlet when either the fluid flow rate becomes excessively high through said device or said device is tilted through a predetermined angle from its normal operating orientation.
Brief Description of the Drawing A preferred form of the present invention will now be described by way of example with reference to the accompanying drawing, which schematically depicts in sectioned side elevation a fluid flow shut-off device.
Description of the Preferred Embodiment In the accompanying drawing there is schematically depicted a fluid flow shut-off device 10. The device 10 is connectable to a gas cylinder (not shown) at the inlet end 11. The connection being any convenient means such as snap-on, push-on or screw threaded, connection. At its other end, outlet end 12 is adapted to be connected to a regulator (not shown).
The device 10 has a shaft 13 located in a body 15 adapted to abut a needle valve of the gas cylinder.
The body 15 has a further passage 16 sealingly engaged by O-rings 17 mounted on the shaft 13. The shaft 13 extends to a leading portion 18.
When connected to the regulator, the leading portion 18 is engaged and the shaft 13 moved to operate the needle valve of the gas cylinder. The O-rings 17 divide the passage 16 into an upstream and a downstream position.
The passage 15 communicates with a chamber 19 having an inlet chamber portion 20 and an outlet chamber portion 21. Located in the outlet chamber ~ ~ 3 5 ~ 7 ~
portion 21 is a ball 22. The chamber portion 21 is of a cylindrical configuration, having its axis normal to the axis of the passage 16.
The chamber portion 21 is provided with an 0-ring 23 against which a washer 24 bears. The 0-ring 23 and washer 24 provide an outlet passage 25.
The outlet passage 25 is of a smaller cross sectional area than the ball 22, so that upon the ball 22 seating against the 0-ring 23, fluid flow is prevented.
Fluid leaving the passage 24 passes through the washer 24 via the passage 25 to an outlet passage 26 to be delivered to the outlet end 12.
It should be appreciated that fluid entering the chamber 21, from the chamber 20, has a direction of travel at least partly normal to the direction of travel of fluid entering the passage 25. By providing this configuration, the device 10, if inadvertently tilted or moved, independent of the starting orientation, will act to stop gas flow by engagement of the ball 22 with the 0-ring 23. This will also occur when there is excessively high gas speeds.
Also mounted in the body 15 is a hollow shaft 27 having a central passage 28 extending to the passage 25. The passage 28 communicates with a pressure gauge 29. Still further, the shaft 27 is movable in the direction of the arrow 39 so that movement of the shaft 27 can move the ball 22 from engagement with the 0-ring 23 in order to reset the devlce 10.
~ here a steel ball 22 is employed, it has been found that the ratio of the ball diameter to the diameter of the chamber 21 is.approximately .7.
It has also been found that the ball 22 if provided with a weight of about 4.3 gm (about 4.8 mm diameter) co-operates with a chamber 21 diameter of 6.60 mm. As a further alternative, a ball 22 having a weight of 4.871 gm (5.40 mm diameter) co-operates with a chamber 21 diameter of 7.50 mm.
~s
Background of the Inven~ion The present invention relates to fluid flow shut-off devices and in particular to an emergency, automatic shut-off device for gas cylinder operation.
Discussion of Prior Art An automatic fluid flow shut-off device is known in which a ball moves into engagement with a seat to prevent gas flow in emergencies. However, it can not be guaranteed that the device will operate in all circumstances, particularly if the device is incorrectly oriented relative to the horizontal.
German Specification 2249598 describes a ball valve which is operated if the gas flow becomes excessive. The valve is intended to be operated so that the valve is accelerated upwardly against the force of gravity when the gas flow becomes excessive.
There is no consideration given to providing this valve with a shut-off function if it becomes incorrectly oriented. Still further, the various embodiments of this particular device shown and dlscussed, do not lend themselves to actuation if the device is merely tilted.
Objects and Summary of the Invention It is the object of the present invention to overcome or substantially ameliorate the above disadvantage.
There is disclosed herein a fluid flow shut-off device comprising:
a hollow body having an inlet connection portion to be connected to a supply of fluid under pressure, and an outlet connection portion to be connected to an apparatus to receive said fluid, said body providing a chamber through which the fluid passes from a chamber inlet to a chamber outlet, said inlet and outlet being positioned so that fluid entering said chamber enters in a direction having a direction component normal to the , 1 ~ 3~ ~7 ~ ~
direction of the fluid entering said outlet, w~th said outlet being positioned at an upper portion of said chamber whell said device is in its norma7 operating orientation having said inlet generally horizontally fac~ng;
a movable valve ball captively located within said chamber to selectively engage said outlet to prevent fluid flow therethrough, wherein said ball will engage said outlet when either the fluid flow rate becomes excessively high through said device or said device is tilted through a predetermined angle from its normal operating orientation.
Brief Description of the Drawing A preferred form of the present invention will now be described by way of example with reference to the accompanying drawing, which schematically depicts in sectioned side elevation a fluid flow shut-off device.
Description of the Preferred Embodiment In the accompanying drawing there is schematically depicted a fluid flow shut-off device 10. The device 10 is connectable to a gas cylinder (not shown) at the inlet end 11. The connection being any convenient means such as snap-on, push-on or screw threaded, connection. At its other end, outlet end 12 is adapted to be connected to a regulator (not shown).
The device 10 has a shaft 13 located in a body 15 adapted to abut a needle valve of the gas cylinder.
The body 15 has a further passage 16 sealingly engaged by O-rings 17 mounted on the shaft 13. The shaft 13 extends to a leading portion 18.
When connected to the regulator, the leading portion 18 is engaged and the shaft 13 moved to operate the needle valve of the gas cylinder. The O-rings 17 divide the passage 16 into an upstream and a downstream position.
The passage 15 communicates with a chamber 19 having an inlet chamber portion 20 and an outlet chamber portion 21. Located in the outlet chamber ~ ~ 3 5 ~ 7 ~
portion 21 is a ball 22. The chamber portion 21 is of a cylindrical configuration, having its axis normal to the axis of the passage 16.
The chamber portion 21 is provided with an 0-ring 23 against which a washer 24 bears. The 0-ring 23 and washer 24 provide an outlet passage 25.
The outlet passage 25 is of a smaller cross sectional area than the ball 22, so that upon the ball 22 seating against the 0-ring 23, fluid flow is prevented.
Fluid leaving the passage 24 passes through the washer 24 via the passage 25 to an outlet passage 26 to be delivered to the outlet end 12.
It should be appreciated that fluid entering the chamber 21, from the chamber 20, has a direction of travel at least partly normal to the direction of travel of fluid entering the passage 25. By providing this configuration, the device 10, if inadvertently tilted or moved, independent of the starting orientation, will act to stop gas flow by engagement of the ball 22 with the 0-ring 23. This will also occur when there is excessively high gas speeds.
Also mounted in the body 15 is a hollow shaft 27 having a central passage 28 extending to the passage 25. The passage 28 communicates with a pressure gauge 29. Still further, the shaft 27 is movable in the direction of the arrow 39 so that movement of the shaft 27 can move the ball 22 from engagement with the 0-ring 23 in order to reset the devlce 10.
~ here a steel ball 22 is employed, it has been found that the ratio of the ball diameter to the diameter of the chamber 21 is.approximately .7.
It has also been found that the ball 22 if provided with a weight of about 4.3 gm (about 4.8 mm diameter) co-operates with a chamber 21 diameter of 6.60 mm. As a further alternative, a ball 22 having a weight of 4.871 gm (5.40 mm diameter) co-operates with a chamber 21 diameter of 7.50 mm.
~s
Claims (11)
1. A fluid flow shut-off device comprising:
a hollow body having an inlet connection portion to be connected to a supply of fluid under pressure, and an outlet connection portion to be connected to an apparatus to receive said fluid, said body providing a chamber through which the fluid passes from a chamber inlet to a chamber outlet, said inlet and outlet being positioned so that fluid entering said chamber enters in a direction having a direction component normal to the direction of the fluid entering said outlet, with said outlet being positioned at an upper portion of said chamber when said device is in its normal operating orientation having said inlet generally horizontally facing;
a movable valve ball captively located within said chamber to selectively engage said outlet to prevent fluid flow therethrough, wherein said ball will engage said outlet when either the fluid flow rate becomes excessively high through said device or said device is tilted through a predetermined angle from its normal operating orientation.
a hollow body having an inlet connection portion to be connected to a supply of fluid under pressure, and an outlet connection portion to be connected to an apparatus to receive said fluid, said body providing a chamber through which the fluid passes from a chamber inlet to a chamber outlet, said inlet and outlet being positioned so that fluid entering said chamber enters in a direction having a direction component normal to the direction of the fluid entering said outlet, with said outlet being positioned at an upper portion of said chamber when said device is in its normal operating orientation having said inlet generally horizontally facing;
a movable valve ball captively located within said chamber to selectively engage said outlet to prevent fluid flow therethrough, wherein said ball will engage said outlet when either the fluid flow rate becomes excessively high through said device or said device is tilted through a predetermined angle from its normal operating orientation.
2. The fluid flow shut-off device of claim 1, wherein said outlet is generally downwardly facing and said chamber is of a cylindrical configuration, with the longitudinal axis thereof vertically oriented during normal operation.
3. The fluid flow shut-off device of claim 2, wherein said outlet is provided with a resilient ring against which said ball engages.
4. The fluid flow shut-off device of claim 3, wherein said inlet connection portion and said outlet connection portion are horizontally aligned along a common axis, and the longitudinal axis of said chamber extends generally radially from said common axis.
5. The fluid flow shut-off device of claim 4, further including a valve actuator extending from said outlet connection portion to said inlet connection portion to operate a valve of said supply upon said outlet connection portion being connected to said apparatus.
6. The fluid flow shut-off device of claim 5, further including a hollow shaft slided mounted within said body for connection to a pressure measuring gauge which hollow shaft is movable from a retracted position clear of said outlet, and a reset position protruding through said outlet to dislodge said ball.
7. The fluid flow shut-off device of claim 6, wherein said body has a passage extending along said common axis, which passage receives said valve actuator, which passage is sealingly divided between a downstream portion located in said inlet connection portion, and an upstream portion located in said outlet connection portion.
8. The fluid flow shut-off device of claim 7, wherein said outlet communicates with said upstream portion, and said downstream portion communicates with said inlet.
9. The fluid flow shut-off device of claim 2, wherein the ratio of the ball diameter to the chamber diameter is about .7, and said ball is formed of steel.
10. The fluid flow shut-off device of claim 2, wherein said ball has a weight of about 4.3gm and a diameter of about 4.8mm, and said chamber has a diameter of about 6.6mm.
11. The fluid flow shut-off device of claim 2, wherein said ball has a weight of about 4.9gm and a diameter of about 5.4mm, and said chamber has a diameter of about 7.5mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPI996888 | 1988-08-19 | ||
| AUPI9968 | 1988-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1315175C true CA1315175C (en) | 1993-03-30 |
Family
ID=3773301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000608922A Expired - Lifetime CA1315175C (en) | 1988-08-19 | 1989-08-21 | Automatic fluid flow shut-off device |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1315175C (en) |
| WO (1) | WO1990002281A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2243668A (en) * | 1990-05-04 | 1991-11-06 | Hsiao Cheng Sheng | Gas valve unit |
| ES2148031B1 (en) * | 1997-05-06 | 2001-05-01 | Bsh Fabricacion Sa | SECURITY DEVICE FOR GAS DEVICES. |
| WO2008047288A2 (en) * | 2006-10-19 | 2008-04-24 | Gary Kenneth Diamond | A valve |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3610263A (en) * | 1968-05-31 | 1971-10-05 | Gary Alan Walters | Fuel tank safety valve assembly |
| GB1534672A (en) * | 1977-01-11 | 1978-12-06 | Leung Wing Kwong | Flow cut-off device for insertion in a gas duct |
| JPS55119264A (en) * | 1979-03-07 | 1980-09-12 | Atsuji Ogawa | Gas stopcock |
| JPS56141473A (en) * | 1980-04-07 | 1981-11-05 | Nissan Motor Co Ltd | Pressure controller equipped with liquid effluence preventing mechanism |
| JPS587879B2 (en) * | 1980-09-02 | 1983-02-12 | 岐阜富士工器株式会社 | LP gas container valve |
| JPS57210221A (en) * | 1981-06-20 | 1982-12-23 | Osaka Gas Co Ltd | Emergency intercepting valve |
| GB8426573D0 (en) * | 1984-10-19 | 1984-11-28 | Gkn Technology Ltd | Valve |
| NZ211199A (en) * | 1985-02-22 | 1987-03-31 | Raymond Quested | Valve,actuated automatically by excess flow |
| JP2615111B2 (en) * | 1986-01-24 | 1997-05-28 | プリミアー・フオスターズ・（オーストラリア）・リミテッド | Automatic fluid flow cutoff device |
-
1989
- 1989-08-21 CA CA000608922A patent/CA1315175C/en not_active Expired - Lifetime
- 1989-08-21 WO PCT/AU1989/000355 patent/WO1990002281A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990002281A1 (en) | 1990-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |