CA1255898A - Sliding gate valve for the outlet of a metallurgical vessel - Google Patents
Sliding gate valve for the outlet of a metallurgical vesselInfo
- Publication number
- CA1255898A CA1255898A CA000483734A CA483734A CA1255898A CA 1255898 A CA1255898 A CA 1255898A CA 000483734 A CA000483734 A CA 000483734A CA 483734 A CA483734 A CA 483734A CA 1255898 A CA1255898 A CA 1255898A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- outlet
- flow
- sliding gate
- flow opening
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/24—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Furnace Charging Or Discharging (AREA)
- Sliding Valves (AREA)
Abstract
ABSTRACT
A sliding gate valve for the horizontal outlet of a metall-urgical vessel includes two valve members which are relatively slidable whilst substantially maintaining a seal between them. Each valve member has a substantially rectangular, elongate flow opening, respectively, whose longitudinal axes extend parallel to one another but transverse to the sliding direction.
A sliding gate valve for the horizontal outlet of a metall-urgical vessel includes two valve members which are relatively slidable whilst substantially maintaining a seal between them. Each valve member has a substantially rectangular, elongate flow opening, respectively, whose longitudinal axes extend parallel to one another but transverse to the sliding direction.
Description
23843~
The present invention relates to sliding gate valves for the outlet, in particular the horizontal outlet, of a metall-urgical vessel and is particularly concerned with such valves for vessels having a horizontal outlet.
The provision of metallurgical vessels, e.g. pouring furnaces or pouring distributors, with a horizontal, or at least approaching horizontal, outlet which is controlled by a sliding gate valve mounted on the side wall of the furnace has proved to be very satisfactory, particularly in the nonferrous metal casting industry.
When the sliding gate valve is open the melt flows out in a horizontal direction and is subsequently passedS for instance, directly into a casting~mould. The refractory valve plates commonly have round flow opentngs~which produce a tight stream of melt which is strongly turbulent at the outlet of the sliding gate-valve and which on impingement, e.g. with the side o the pouring gate of a . .
casting mould, can cause an undesirable spraying or splashing and waves on the melt in the pour mg openlng. The formation of oxides is also promoted~in the melt, which can produce a reduction in quality of the metal in lts solidified state.
~20 Furthermore, it lS desirable to be able to pour precisely dosed ~uantities of melt in rapid sequence with such sliding gate valves. However, if the valve plates have round flow openings a relatively large distance must be travelled by the sliding plate in ; order to close the valve. Delays in the interruption of the outflow of the melt thus occur which render the precise dosing~of the melt more difficult.
., ~d~
s~
lt is an object of the present ;nvention to provide a sliding gate valve, particularly for the horizontal outlet o a metallurgical vessel~ which causes the metal melt to 10w out ~.
uniformly and substantially in a laminar manner from the sliding gate valve and which enables the melt to be rapidly and precisely dosed.
According to the present invention a sliding gate valve for the outlet of a metallurgical vessel includes at least two valve members which are relatively slidable in a sliding direction whilst substantially maintaining a seal between them, each valve member having at least one elongate flow opening, the longitudinal axes o the 10w openings extending parallel to one another and trans- : -verse to the sliding direction. The 10w openings which are elonga*e or generally slot-shaped are preferably o substantially rectangular section and the length of the rectangle may be three or our times its breadth.
The use of elongate flow openings which extend parallel to one another produces a flow o the melt:which Is uniormly dist- : ~;
ributed over the~entire cross-section of the flow openings and a relatively flat flow o small depth. The fact that the sliding direction~ that is to say the direction ln which the sliding member or plate moves relative to the fixed member or plate, extends trans-verse tc the longitudinal~axes of the flow openings means that a rapid and precise dosing of the melt may be acllieved in a simple manner. The valve may include an inlet sleeve and/or an outlet sleeve , : situated adjacent a respective valve member and, in this event, the . .-inlet and/or outlet~sleeve preferably has an elongate flow opening :~ ''`_,' ~ ' ' ~ : :
:; : , ~255R~5 in it whose longitudinal axis is in registry with that of the flow opening in the respective valve member. It is preferred that the corners of the flow openings are rounded, since this not only sub-stantially prevents the flow openings from becoming clogged at the corners but also substantially reduces the danger of cracks forming in the valve members and in the inlet and outlet sleeves.
The invention also embraces a metallurgical vessel whose outlet is controlled by such a valve and in this event it is pre-ferred that the outlet is substantially horizontal and that the longitudinal axes of the flow openings extend substantially horizon-tally also.
Further features ancl details of the invention will be apparent from the following description of certain exemplary embodi-ments which is given with reference to the accompanying drawings, in ; which:
Figure 1 is a perspecitve schematic view of a sliding gate valve in accordance with the invention, in ~situ in a metallurgical vessel;
Figure 2 is a perspective schematic, partly sectioned view ~20 of a sliding gate valve with an outlet sl~eeve;
Figure 3 is a perspective sehematic, partly sectioned view of a sliding gate valve without an outlet sleeve; and Figure 4 is a schematic elevation of the valve plates of a sliding gate valve.
~;~ The slidlng gate~valve 10 illustrated in Figure 1 is mounted on the side wall 14 of a metallurgical vessel 12. The valve is of l mear type and comprises substantially a slideT housing 20, a ~ . , ::::::: : :
:
~3~
. . :~:, :, . , :
~2558~3~3 linear dr:ive unit 22, a protective hood 28, sliding and fixed refractory valve plates 25 and 26 respectively, a refractory inlet sleeve 27 and a refractory tapping spout 30. The sliding plate 25 is connected to a slider carrier (not shown) which is connected to be moved m the vertical directlon by the drive unit 22.
~:
~: :
:~L25589~3 Not all the features o~ the sliding gate valve 10 are referred to but onl those which are o signific~nce to the present invention-The drive unit 22, which is e.~, a h~draullc piSton/
5. cylinder unit, enables the open:in~ and closing of thevalve by moving the valve plate 25 together with the tapping - spout 30 to be controlled either manuall~ or automatically.
The sliding valve plate 25 is in sealing and sliding contact on one side with the fixed valve plate 26 and is connected 10. on the other side to the tapping spoUt 30 which thus moves with it. The inlet sleeve 27 which constitutes a nozzle brick is in sealing engagement with the fixed PIate 26 and is also firmly built ;in to the wall of~the vessel 12.
An intermediate sleeve 15 enables the sleeve 27 to be 15. secured in position and removed again. In accordance with the invention both the vaLve pIates 25~and~26 and also the inlet sleeve 27 are each provided with an~elongate or~slot-shaped flow~opening 25~',26'~and 27'~respectively and the tapping spo;ut 30 includes a bed 30' whose~ shape corresponds 20. to that of the~lower portion of the~flow opening 25'.~ The flow openings~25',26' and 27' are~so~oriented that thelr longitudlnal~dlrection or~axis A ~extends;~in the~horizontal direction. ~In the open position of the~sliding gate valve lO,;illustrated in Figure l, the flow openings are in 5- ~registry with one~another. ~The~flow opening 27~' in the lnlet sleeve 27 is~coni~cally flared at 27" towards the interior of ; the vessel 12 at its;upstream end which provides~a smooth flow of the melt into the outlet~l6.~
When the sliding gaté~valve 10 is opened, the melt, 30- which may be~aluminium, within~the vessel 12, which may be constructed~as~a~smelting furnace,flows~into the outlet 16 which is situa-ted;directly~above the Dase~13 of~the vessel 12 ;89~3 and is distributed uniformly oVer the entiXe breadth of the flow openings 27', 26' and 25~ and the bed 3Q' of the tapping spout 30. There is thus a flat, unifonn stream of the outflowing melt at the outlet point 30" ~f the S. sliding gate valve which is distributed oVer the entire breadth of the tapping spout 30.
Due to the fact that the valve plate 25 is movable transverse to the longitudinal axis o~ the flow o~enings, the flow openings 25' and 26' of the two valve plates 25 10. and 26 define a flow cross-section which produces a stream of melt when they are in the throttled position with a geometrical shape similar to that in thé fully open position.
Thus a further advantage of the construction of the present invention is that a uniform and substantially turbulence-15. free outflow of the metal melt is produced both in the fullyopen and in the throttled positions of the sliding gate valve.
, In the sliding gate valve 10 shown~in Figure 2, a tubular outlet sleeve 24 of~the type which i5 commonly used 20. with sliding gate valves is provlded~instea~d~of ~a tapplng spout. The outlet sleeve 24 is, in this case, maintained in sealing abutment with the~valve plate 25~by means of a~
mechanical connection~with~t~he~slider carrier (not shown).
;; The outlet sleeve 24~ is, in accordanCe with the invention, 25. constructed wlth a ~slot-shaped or elongate flow opening 24' which in the open position of the valve is in registry with the flow openin~ 25'. ;
The sliding gate~valve 10 of~Figure 3 has neither an inlet nor an outlet sleeve. In o~rder to~minimise the~heat 30-~ and quality losses of the;outflowing~melt~it is desirable that the melt flows from the vessel 12 by the most direct :
~ 5-;
: ~ : . -' , . : ' -: :~ : . .
,. .
: ' , : -5i5~
route possible into, for instance, a not illustrated casting mould or a fixed collecting gulley ~not shown). This is achievcd in the construction of Figure 3 in which a sleeve 34 is provided on the inlet side with a significantly larger flow opening 34' than that of the in~et sleeve 27 of Figure 1. On the outlet side no sleeve or spout is provided and the melt flows directly into e.g. the casting mould after leaving the flow opening 25'.
In Figure 4 th,e valve plates 25 and 26 are shown iJI
the closed position. ~ne can clearly see the slot-shaped construction io of the flow openings 25' and 26' and that their longitudinal axes A and A' are parallel ana that these are~ are horiz ntal.
: ~ :
~ : :
: ~ :: -:
' ~ -6-
The present invention relates to sliding gate valves for the outlet, in particular the horizontal outlet, of a metall-urgical vessel and is particularly concerned with such valves for vessels having a horizontal outlet.
The provision of metallurgical vessels, e.g. pouring furnaces or pouring distributors, with a horizontal, or at least approaching horizontal, outlet which is controlled by a sliding gate valve mounted on the side wall of the furnace has proved to be very satisfactory, particularly in the nonferrous metal casting industry.
When the sliding gate valve is open the melt flows out in a horizontal direction and is subsequently passedS for instance, directly into a casting~mould. The refractory valve plates commonly have round flow opentngs~which produce a tight stream of melt which is strongly turbulent at the outlet of the sliding gate-valve and which on impingement, e.g. with the side o the pouring gate of a . .
casting mould, can cause an undesirable spraying or splashing and waves on the melt in the pour mg openlng. The formation of oxides is also promoted~in the melt, which can produce a reduction in quality of the metal in lts solidified state.
~20 Furthermore, it lS desirable to be able to pour precisely dosed ~uantities of melt in rapid sequence with such sliding gate valves. However, if the valve plates have round flow openings a relatively large distance must be travelled by the sliding plate in ; order to close the valve. Delays in the interruption of the outflow of the melt thus occur which render the precise dosing~of the melt more difficult.
., ~d~
s~
lt is an object of the present ;nvention to provide a sliding gate valve, particularly for the horizontal outlet o a metallurgical vessel~ which causes the metal melt to 10w out ~.
uniformly and substantially in a laminar manner from the sliding gate valve and which enables the melt to be rapidly and precisely dosed.
According to the present invention a sliding gate valve for the outlet of a metallurgical vessel includes at least two valve members which are relatively slidable in a sliding direction whilst substantially maintaining a seal between them, each valve member having at least one elongate flow opening, the longitudinal axes o the 10w openings extending parallel to one another and trans- : -verse to the sliding direction. The 10w openings which are elonga*e or generally slot-shaped are preferably o substantially rectangular section and the length of the rectangle may be three or our times its breadth.
The use of elongate flow openings which extend parallel to one another produces a flow o the melt:which Is uniormly dist- : ~;
ributed over the~entire cross-section of the flow openings and a relatively flat flow o small depth. The fact that the sliding direction~ that is to say the direction ln which the sliding member or plate moves relative to the fixed member or plate, extends trans-verse tc the longitudinal~axes of the flow openings means that a rapid and precise dosing of the melt may be acllieved in a simple manner. The valve may include an inlet sleeve and/or an outlet sleeve , : situated adjacent a respective valve member and, in this event, the . .-inlet and/or outlet~sleeve preferably has an elongate flow opening :~ ''`_,' ~ ' ' ~ : :
:; : , ~255R~5 in it whose longitudinal axis is in registry with that of the flow opening in the respective valve member. It is preferred that the corners of the flow openings are rounded, since this not only sub-stantially prevents the flow openings from becoming clogged at the corners but also substantially reduces the danger of cracks forming in the valve members and in the inlet and outlet sleeves.
The invention also embraces a metallurgical vessel whose outlet is controlled by such a valve and in this event it is pre-ferred that the outlet is substantially horizontal and that the longitudinal axes of the flow openings extend substantially horizon-tally also.
Further features ancl details of the invention will be apparent from the following description of certain exemplary embodi-ments which is given with reference to the accompanying drawings, in ; which:
Figure 1 is a perspecitve schematic view of a sliding gate valve in accordance with the invention, in ~situ in a metallurgical vessel;
Figure 2 is a perspective schematic, partly sectioned view ~20 of a sliding gate valve with an outlet sl~eeve;
Figure 3 is a perspective sehematic, partly sectioned view of a sliding gate valve without an outlet sleeve; and Figure 4 is a schematic elevation of the valve plates of a sliding gate valve.
~;~ The slidlng gate~valve 10 illustrated in Figure 1 is mounted on the side wall 14 of a metallurgical vessel 12. The valve is of l mear type and comprises substantially a slideT housing 20, a ~ . , ::::::: : :
:
~3~
. . :~:, :, . , :
~2558~3~3 linear dr:ive unit 22, a protective hood 28, sliding and fixed refractory valve plates 25 and 26 respectively, a refractory inlet sleeve 27 and a refractory tapping spout 30. The sliding plate 25 is connected to a slider carrier (not shown) which is connected to be moved m the vertical directlon by the drive unit 22.
~:
~: :
:~L25589~3 Not all the features o~ the sliding gate valve 10 are referred to but onl those which are o signific~nce to the present invention-The drive unit 22, which is e.~, a h~draullc piSton/
5. cylinder unit, enables the open:in~ and closing of thevalve by moving the valve plate 25 together with the tapping - spout 30 to be controlled either manuall~ or automatically.
The sliding valve plate 25 is in sealing and sliding contact on one side with the fixed valve plate 26 and is connected 10. on the other side to the tapping spoUt 30 which thus moves with it. The inlet sleeve 27 which constitutes a nozzle brick is in sealing engagement with the fixed PIate 26 and is also firmly built ;in to the wall of~the vessel 12.
An intermediate sleeve 15 enables the sleeve 27 to be 15. secured in position and removed again. In accordance with the invention both the vaLve pIates 25~and~26 and also the inlet sleeve 27 are each provided with an~elongate or~slot-shaped flow~opening 25~',26'~and 27'~respectively and the tapping spo;ut 30 includes a bed 30' whose~ shape corresponds 20. to that of the~lower portion of the~flow opening 25'.~ The flow openings~25',26' and 27' are~so~oriented that thelr longitudlnal~dlrection or~axis A ~extends;~in the~horizontal direction. ~In the open position of the~sliding gate valve lO,;illustrated in Figure l, the flow openings are in 5- ~registry with one~another. ~The~flow opening 27~' in the lnlet sleeve 27 is~coni~cally flared at 27" towards the interior of ; the vessel 12 at its;upstream end which provides~a smooth flow of the melt into the outlet~l6.~
When the sliding gaté~valve 10 is opened, the melt, 30- which may be~aluminium, within~the vessel 12, which may be constructed~as~a~smelting furnace,flows~into the outlet 16 which is situa-ted;directly~above the Dase~13 of~the vessel 12 ;89~3 and is distributed uniformly oVer the entiXe breadth of the flow openings 27', 26' and 25~ and the bed 3Q' of the tapping spout 30. There is thus a flat, unifonn stream of the outflowing melt at the outlet point 30" ~f the S. sliding gate valve which is distributed oVer the entire breadth of the tapping spout 30.
Due to the fact that the valve plate 25 is movable transverse to the longitudinal axis o~ the flow o~enings, the flow openings 25' and 26' of the two valve plates 25 10. and 26 define a flow cross-section which produces a stream of melt when they are in the throttled position with a geometrical shape similar to that in thé fully open position.
Thus a further advantage of the construction of the present invention is that a uniform and substantially turbulence-15. free outflow of the metal melt is produced both in the fullyopen and in the throttled positions of the sliding gate valve.
, In the sliding gate valve 10 shown~in Figure 2, a tubular outlet sleeve 24 of~the type which i5 commonly used 20. with sliding gate valves is provlded~instea~d~of ~a tapplng spout. The outlet sleeve 24 is, in this case, maintained in sealing abutment with the~valve plate 25~by means of a~
mechanical connection~with~t~he~slider carrier (not shown).
;; The outlet sleeve 24~ is, in accordanCe with the invention, 25. constructed wlth a ~slot-shaped or elongate flow opening 24' which in the open position of the valve is in registry with the flow openin~ 25'. ;
The sliding gate~valve 10 of~Figure 3 has neither an inlet nor an outlet sleeve. In o~rder to~minimise the~heat 30-~ and quality losses of the;outflowing~melt~it is desirable that the melt flows from the vessel 12 by the most direct :
~ 5-;
: ~ : . -' , . : ' -: :~ : . .
,. .
: ' , : -5i5~
route possible into, for instance, a not illustrated casting mould or a fixed collecting gulley ~not shown). This is achievcd in the construction of Figure 3 in which a sleeve 34 is provided on the inlet side with a significantly larger flow opening 34' than that of the in~et sleeve 27 of Figure 1. On the outlet side no sleeve or spout is provided and the melt flows directly into e.g. the casting mould after leaving the flow opening 25'.
In Figure 4 th,e valve plates 25 and 26 are shown iJI
the closed position. ~ne can clearly see the slot-shaped construction io of the flow openings 25' and 26' and that their longitudinal axes A and A' are parallel ana that these are~ are horiz ntal.
: ~ :
~ : :
: ~ :: -:
' ~ -6-
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A sliding gate valve for the outlet of a metallurgical vessel including at least two valve members which are relatively slidable in a sliding direction whilst substantially maintaining a seal between them, each valve member having at least one elongate flow opening, the longitudinal axes of the flow openings extending parallel to one another and transverse to the sliding direction.
2. A valve as claimed in claim 1, including at least one of an inlet sleeve and an outlet sleeve which is situated adjacent a respective valve member and has an elongate flow opening in it whose longitudinal axis is in registry with that of the flow opening in the respective valve member.
3. A valve as claimed in claim 1, including a tapping spout on the outlet side having a bed defining a flow passage whose shape and size are substantially the same as those of part of the flow opening in the adjoining valve member.
4. A valve as claimed in claim 1, 2 or 3, in which the flow openings are of substantially rectangular shape with rounded corners.
5. A metallurgical vessel having a horizontal outlet controlled by a valve as claimed in claim 1, 2 or 3, in which the longituninal axes of the flow openings extend substantially horizontally.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH298584A CH663368A5 (en) | 1984-06-20 | 1984-06-20 | SLIDING SEAL FOR THE SPOUT, IN PARTICULAR HORIZONTAL SPOUT, MILLED FROM METAL MELT. |
| CH2985/84-3 | 1984-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1255898A true CA1255898A (en) | 1989-06-20 |
Family
ID=4246069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000483734A Expired CA1255898A (en) | 1984-06-20 | 1985-06-12 | Sliding gate valve for the outlet of a metallurgical vessel |
Country Status (6)
| Country | Link |
|---|---|
| JP (2) | JPS6114071A (en) |
| CA (1) | CA1255898A (en) |
| CH (1) | CH663368A5 (en) |
| DE (1) | DE3426107A1 (en) |
| FR (1) | FR2566302B1 (en) |
| GB (1) | GB2160803B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19857257B4 (en) * | 1998-12-11 | 2006-12-07 | OCé PRINTING SYSTEMS GMBH | Developing device with Tonersprüheinrichtung whose mixture flow obliquely impinges on a job area |
| US20040239016A1 (en) * | 2001-11-13 | 2004-12-02 | King Patrick Dana | Multi-hole, multi-edge control phate for linear sliding gate |
| EP2319640A1 (en) * | 2009-10-21 | 2011-05-11 | Vesuvius Group S.A | Casting nozzle and assembly of such a nozzle with an inner nozzle |
| CN102328071A (en) * | 2011-10-08 | 2012-01-25 | 维苏威高级陶瓷(苏州)有限公司 | Sliding plate for flow control of ladle |
| CN110394441B (en) * | 2019-06-26 | 2021-04-13 | 太原科技大学 | Gate type magnesium alloy casting and rolling machine front box flow control device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1859007U (en) * | 1958-07-16 | 1962-09-27 | Edgar Dr Hagenburger | SPOUT FOR CASTING PANS. |
| DE1910247A1 (en) * | 1969-02-28 | 1970-09-10 | Neitzel Dipl Ing Martin | Device and method for pouring metallurgical melts and similar products |
| IE36369B1 (en) * | 1971-06-07 | 1976-10-13 | Uss Eng & Consult | Ladle gate valve |
| CA1103921A (en) * | 1976-10-15 | 1981-06-30 | Earl P. Shapland | Throttling molten metal teeming valve |
| CH649610A5 (en) * | 1980-09-24 | 1985-05-31 | Stopinc Ag | LOCKING PLATE PAIR FOR A SLIDING LOCK. |
| JPS57160570A (en) * | 1981-03-30 | 1982-10-02 | Kurosaki Refract Co Ltd | Sliding nozzle device having gas blowing part in anticipated negative pressure or vortex generating zone |
| JPS57168762A (en) * | 1981-04-09 | 1982-10-18 | Kurosaki Refract Co Ltd | Composite structure of sliding nozzle plate |
| JPS5886957A (en) * | 1981-11-18 | 1983-05-24 | Kawasaki Heavy Ind Ltd | Sliding gate for horizontal continuous casting installation |
-
1984
- 1984-06-20 CH CH298584A patent/CH663368A5/en not_active IP Right Cessation
- 1984-07-16 DE DE19843426107 patent/DE3426107A1/en active Granted
-
1985
- 1985-06-12 CA CA000483734A patent/CA1255898A/en not_active Expired
- 1985-06-18 JP JP13097985A patent/JPS6114071A/en active Pending
- 1985-06-19 GB GB08515554A patent/GB2160803B/en not_active Expired
- 1985-06-19 FR FR8509347A patent/FR2566302B1/en not_active Expired
-
1988
- 1988-05-24 JP JP6759088U patent/JPS63196352U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2566302B1 (en) | 1987-01-09 |
| DE3426107A1 (en) | 1986-01-02 |
| CH663368A5 (en) | 1987-12-15 |
| JPS63196352U (en) | 1988-12-16 |
| DE3426107C2 (en) | 1987-01-22 |
| FR2566302A1 (en) | 1985-12-27 |
| GB2160803B (en) | 1987-06-24 |
| GB8515554D0 (en) | 1985-07-24 |
| JPS6114071A (en) | 1986-01-22 |
| GB2160803A (en) | 1986-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |