CA2074911A1 - Strip casting machine - Google Patents
Strip casting machineInfo
- Publication number
- CA2074911A1 CA2074911A1 CA 2074911 CA2074911A CA2074911A1 CA 2074911 A1 CA2074911 A1 CA 2074911A1 CA 2074911 CA2074911 CA 2074911 CA 2074911 A CA2074911 A CA 2074911A CA 2074911 A1 CA2074911 A1 CA 2074911A1
- Authority
- CA
- Canada
- Prior art keywords
- rolls
- casting machine
- strip casting
- pool
- machine according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
TITLE: Strip casting machine ABSTRACT OF THE DISCLOSURE
A strip casting machine including means for feeding molten material from a pool of material through a gap between a pair of contra-rotating rolls, the machine including means for cooling said rolls and for controlling their rotational speed.
A strip casting machine including means for feeding molten material from a pool of material through a gap between a pair of contra-rotating rolls, the machine including means for cooling said rolls and for controlling their rotational speed.
Description
~V7493.::L
FIELD OF THE INVENTION
The invention relates to a strip casting machina primarily intend~d for the casting of lead ~trip although it will be undarstood that other metals, metal alloys, mixtures of metals and non~metallic fillers, and also such materials as polycarbonates and acrylics, may be able to be cast in the form of strip by a machine embodying the invention.
S~MMARY OF THE INVENTION
Accoxding to the invention, there i9 provided a strip casting machine including a pair of rolls, means for supplying molten material to a spaca between the rolls, the spacing o~ which defines a gap through which the ma~erial is to bo fed, means for cooling said rolls whereby to cool the molten material carried into the gap, and means for driving said rolls in contra-rotation to control the feed of the material through said gap. The means for cooling the pair of rolls may be interior spaces within said rolls for the circulation of a cooling fluid. The means for driving the rolls may include means for monitoring the power consumption of a drive motor, and means for increasing the driven speed of the rolls in response to an lncrease of power consumption. Alternatively, 2a7~
means for driving the rolls may include means for sensing the force tending to separate the rolls during the operation o the machine, and for increasing the drivan speed of the rolls in response to an increase in the force tending to separate said rolls.
The machine may include a containing space for holding the molten material above and between the rolls, said space being enclosed at opposite ends by respective plates urged into sliding engagement with end surfaces of said rolls. The plates at the opposite ends of the rolls may be urged into sliding engagement with the end surfaces of tha roll~ by spring means.
The machine may include ad~ustment means whereby the distance between the two rolls is ad~ustable.
Means may be provided for maintaining a pool of molten material above and between the two rolls at a substantially constant level, conveniently a dip-probe and a solenoid operated valve actuated bysaid probe. The means for maintaining the level of said pool of molten material may comprise means for feeding the molten material to the pool at a rate greater than that at which the material is fed between the rolls, and overflo~ means for returning excess material from the pool. A holding tank may 2~7~911 be provided for feeding the molten material to the pool of material, and there may be provided means for maintaining the depth of molten material in said holding tank comprising means for feeding the material to said tank at a rate greater than that at which the material is fed between the rolls, and ovsrflow means in said tank for retu:rnlng excess material therefrom.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a semi-diagrammatic view of a metal strip casting machine embodying the invention, Figure 2 is a diagrammatic view illustrating a control means for the machine, Figure 3 is a circuit diagram, Figu~a 4 is a view slmilar to Figure 1 and illustrating a possible modification, and Figure 5 is a view of a further possible modification.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to Figure 1 of the drawings, the metal strip casting machine there illustrated includes a pair of water cooled rolls 10,10 spaced apart side by side, as shown, and capable of being driven, by means not shown, in contra-rotation as indicated by the arrows. A space, generally indicated 12, which is to contain molten metal 2~7~91~
above and between the rolls is enclosed at its opposite ends by respective graphite plates 14 which are acted upon by spring means (not shown) to urge them into sliding engagement with the and surfaces of the rolls.
The arrangement is such that the molten metal contacting the water cooled rolls is chilled and as the rolls rotate as indicated by the arrows, a metal strip is formed in the "nip" between the two rolls and is carried downwards as shown by the chain-dotted lines.
The spacing of the two rolls, that is to say the width of the gap between them, is ad~ustable (by means not shown) between zero and some desired maximum, for example up to 2.5 mm. In this way the thickness o the mstal strip being carried downwards by the two rolls is ad~ustable. ~he metal strip being carried downwards by the rolls is guided towards a pair of rollers 16,16 which in turn guide the strip towards a slitting head (not shown).
Means are provided for maintaining the level of the pool of molten metal between the two rolls 10,10. As shown, these means are constituted by a dip-probe 18 and a solenoid op~rated valve 20 which can be opened to allow the gravity flow of molten 2~ ~19:~
metal from a holding tank 22. The holding tank is itself replenished from time to time from a melting pot 24. A dip-probe 26 and a solenoid operated valve 2~ are provided to monitor the level of molten metal in the holding tank ancl to control the flow of molten metal from the melting pot, respectively.
The cooling flow through the rolls 10,10 takes place through rotatable connectors (not shown) mounted on the roll spindles. Means are provided for controlling the rate of flow of water through the rolls to suit the temperature o~ the molten metal in the space 12 above and between the rolls and the thickne3s and the rate of ~ravel o metal strip being carried downwards between the rolls.
Referring now to Figure 2, this illustrates the way in which, dux.ing the operation of the machine, the molten metal carried into the gap between the rolls is chilled by contact with the roll~.
Ideally, as shown in full lines, the molten metal will have solidified throughout the thickness of the strip being produced as it reaches the planP
containing the axes of the two rolls.
If the molten metal has solidified at some distance above the plane containing the axes of the two rolls, for example in the region indicated .
2 ~ ~1 4 9 ~
by ~he chain-dotted lines in Figure 2, the rolls will re~uire to act in the manner of the rolls of a rolling mill and the powar consumption of the electric motor (not shown in Figures 1 and 2) driving said rolls will increase. Ther~ are therefore provided means or monitoring the force tending to separate the two rolls and for increasing the driven speed of the rolls in response to a significant increase of said force.
The means for monitoring the force tending to separate the two rolls are constituted by a ~train gauge 11. In Figure 3 there is illustrated the means whereby the driven speed of the rolls is automatically increased ~n response to a slgnificant increase of the force tending to separate the two rolls. The motor unit 13 for driving the rolls is provided with a tacho-generator 15 the outpu~ from which is fed to a comparator circuit 17 in opposition to a signal ; 20 from the strain gauge 11. The diference, or error, between the two signals controls the output stage of a triac 19 which is provided for automatically adjusting the coil excitation level of the unit connecting the motor and roll drive.
In operation of the machine, a significant increase of the force tending to separate the two 2 0 7 ~ 9 :L ~
rolls results in an increased speed damand reference signal from the strain gauge. This immediately results in an error signal being produced so that the motor speed is corraspondingly ~ncreased. The solidlflcation point is thus brought down towards the position shown in full lines in Figure 2, the signal $rom the strain gauge is automatically reduced, and the rotational speed of the rolls is thus allowed to fall. By fine tuning of the speed of response of the system, the solidification of the strip being producad i9 automatically maintained substantially at the position shown in ull lines in Figure 2.
Referring now to Figure 4, in a modi1cation of the machine ~ust described, the meltlng pot 2~ is located at a lower level than the holding tank, and indeed lower than the space 12 above and between the rolls. A pump 30 is provided for feeding the molten metal from the melting pot 24 to the holding tank 22 through pipe 32.
Means which in this case are provided for maintaining the depth of molten material in the holding tank are constituted by an overflow pipe 34 opening from the side of said tank and leading back to the melting pot. Means which are provided for maintaining the depth of the pool of molten ~074911 ma~erial in the space 12 above and between the rolls are constituted by an overflow or weir 36 ormed in one of the graphite plates 14, exc~ss material being returned ~o the melting pot through a down pipe 38 with which said over:Low or weir communicates.
Referring now to Figure 5, this view illustrates a further possible modification in which the pool of molten metal is not held in a space defined by the surfaaas of the two rolls but in a chamber generally indicated ~0 mounted above the rolls.
The chamber has an overflow aperture 42 in an e~nd wall which determines the static head o molten metal. In thls case the molten metal i~ fed to the gap between the rolls through an elongate feed channel 44 extending the full length of the rolls.
A wear rssistant skirt 46 extends below the lower end of the feed channel and bears against the surfaces of the two rolls. (The graphite and plates 14 of Figures 1 and 4 are not shown in Figure 5. They may or may not be required).
POSSIBLE MODIFICATIONS
Various other modifications may be made. For example, the respective plates which in the Figure 1 and Figure 4 constructions enclose the containing space for holding the molten material above and 2~7~19~.1 between the rolls need not necessarily be acted upon, or directly acted upon, by sprin~ means. A
system of levers could be arranged to apply the required forces to said plates, sa:ld levers being 5acted on either by respective springs or by weights acting through respective bell crank leverQ to apply the required lateral forces.
Other means may be provided for automatically maintaining the solidification o the strip 10substantially at the po ition shown in full lines in Figure 2. For example, there could be provided means for monitoring the power consumption of the roll drive motor and means for increasing the driven speed o the rolls in response to a 15significant increase of electria power consumption.
Provision may be made for 'after cooling' of the strip, that i9 to say for the cooling of the strip by a water or other f luid bath or by spray a*ter the strip has exited from the rolls.
20The rolls could conceivably be cooled by a liqu:Ld other than water, or even by vapour, pumped through the hollow interior of each roll.
Although the machine has been described as being for the production of metal strip, it will be 25understood that with suitable adjustments of the temperature controls and drive controls it could be d .~ t used for the production of thermoplas~ics strip, for axample polycarbonates and acryllcs.
FIELD OF THE INVENTION
The invention relates to a strip casting machina primarily intend~d for the casting of lead ~trip although it will be undarstood that other metals, metal alloys, mixtures of metals and non~metallic fillers, and also such materials as polycarbonates and acrylics, may be able to be cast in the form of strip by a machine embodying the invention.
S~MMARY OF THE INVENTION
Accoxding to the invention, there i9 provided a strip casting machine including a pair of rolls, means for supplying molten material to a spaca between the rolls, the spacing o~ which defines a gap through which the ma~erial is to bo fed, means for cooling said rolls whereby to cool the molten material carried into the gap, and means for driving said rolls in contra-rotation to control the feed of the material through said gap. The means for cooling the pair of rolls may be interior spaces within said rolls for the circulation of a cooling fluid. The means for driving the rolls may include means for monitoring the power consumption of a drive motor, and means for increasing the driven speed of the rolls in response to an lncrease of power consumption. Alternatively, 2a7~
means for driving the rolls may include means for sensing the force tending to separate the rolls during the operation o the machine, and for increasing the drivan speed of the rolls in response to an increase in the force tending to separate said rolls.
The machine may include a containing space for holding the molten material above and between the rolls, said space being enclosed at opposite ends by respective plates urged into sliding engagement with end surfaces of said rolls. The plates at the opposite ends of the rolls may be urged into sliding engagement with the end surfaces of tha roll~ by spring means.
The machine may include ad~ustment means whereby the distance between the two rolls is ad~ustable.
Means may be provided for maintaining a pool of molten material above and between the two rolls at a substantially constant level, conveniently a dip-probe and a solenoid operated valve actuated bysaid probe. The means for maintaining the level of said pool of molten material may comprise means for feeding the molten material to the pool at a rate greater than that at which the material is fed between the rolls, and overflo~ means for returning excess material from the pool. A holding tank may 2~7~911 be provided for feeding the molten material to the pool of material, and there may be provided means for maintaining the depth of molten material in said holding tank comprising means for feeding the material to said tank at a rate greater than that at which the material is fed between the rolls, and ovsrflow means in said tank for retu:rnlng excess material therefrom.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a semi-diagrammatic view of a metal strip casting machine embodying the invention, Figure 2 is a diagrammatic view illustrating a control means for the machine, Figure 3 is a circuit diagram, Figu~a 4 is a view slmilar to Figure 1 and illustrating a possible modification, and Figure 5 is a view of a further possible modification.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to Figure 1 of the drawings, the metal strip casting machine there illustrated includes a pair of water cooled rolls 10,10 spaced apart side by side, as shown, and capable of being driven, by means not shown, in contra-rotation as indicated by the arrows. A space, generally indicated 12, which is to contain molten metal 2~7~91~
above and between the rolls is enclosed at its opposite ends by respective graphite plates 14 which are acted upon by spring means (not shown) to urge them into sliding engagement with the and surfaces of the rolls.
The arrangement is such that the molten metal contacting the water cooled rolls is chilled and as the rolls rotate as indicated by the arrows, a metal strip is formed in the "nip" between the two rolls and is carried downwards as shown by the chain-dotted lines.
The spacing of the two rolls, that is to say the width of the gap between them, is ad~ustable (by means not shown) between zero and some desired maximum, for example up to 2.5 mm. In this way the thickness o the mstal strip being carried downwards by the two rolls is ad~ustable. ~he metal strip being carried downwards by the rolls is guided towards a pair of rollers 16,16 which in turn guide the strip towards a slitting head (not shown).
Means are provided for maintaining the level of the pool of molten metal between the two rolls 10,10. As shown, these means are constituted by a dip-probe 18 and a solenoid op~rated valve 20 which can be opened to allow the gravity flow of molten 2~ ~19:~
metal from a holding tank 22. The holding tank is itself replenished from time to time from a melting pot 24. A dip-probe 26 and a solenoid operated valve 2~ are provided to monitor the level of molten metal in the holding tank ancl to control the flow of molten metal from the melting pot, respectively.
The cooling flow through the rolls 10,10 takes place through rotatable connectors (not shown) mounted on the roll spindles. Means are provided for controlling the rate of flow of water through the rolls to suit the temperature o~ the molten metal in the space 12 above and between the rolls and the thickne3s and the rate of ~ravel o metal strip being carried downwards between the rolls.
Referring now to Figure 2, this illustrates the way in which, dux.ing the operation of the machine, the molten metal carried into the gap between the rolls is chilled by contact with the roll~.
Ideally, as shown in full lines, the molten metal will have solidified throughout the thickness of the strip being produced as it reaches the planP
containing the axes of the two rolls.
If the molten metal has solidified at some distance above the plane containing the axes of the two rolls, for example in the region indicated .
2 ~ ~1 4 9 ~
by ~he chain-dotted lines in Figure 2, the rolls will re~uire to act in the manner of the rolls of a rolling mill and the powar consumption of the electric motor (not shown in Figures 1 and 2) driving said rolls will increase. Ther~ are therefore provided means or monitoring the force tending to separate the two rolls and for increasing the driven speed of the rolls in response to a significant increase of said force.
The means for monitoring the force tending to separate the two rolls are constituted by a ~train gauge 11. In Figure 3 there is illustrated the means whereby the driven speed of the rolls is automatically increased ~n response to a slgnificant increase of the force tending to separate the two rolls. The motor unit 13 for driving the rolls is provided with a tacho-generator 15 the outpu~ from which is fed to a comparator circuit 17 in opposition to a signal ; 20 from the strain gauge 11. The diference, or error, between the two signals controls the output stage of a triac 19 which is provided for automatically adjusting the coil excitation level of the unit connecting the motor and roll drive.
In operation of the machine, a significant increase of the force tending to separate the two 2 0 7 ~ 9 :L ~
rolls results in an increased speed damand reference signal from the strain gauge. This immediately results in an error signal being produced so that the motor speed is corraspondingly ~ncreased. The solidlflcation point is thus brought down towards the position shown in full lines in Figure 2, the signal $rom the strain gauge is automatically reduced, and the rotational speed of the rolls is thus allowed to fall. By fine tuning of the speed of response of the system, the solidification of the strip being producad i9 automatically maintained substantially at the position shown in ull lines in Figure 2.
Referring now to Figure 4, in a modi1cation of the machine ~ust described, the meltlng pot 2~ is located at a lower level than the holding tank, and indeed lower than the space 12 above and between the rolls. A pump 30 is provided for feeding the molten metal from the melting pot 24 to the holding tank 22 through pipe 32.
Means which in this case are provided for maintaining the depth of molten material in the holding tank are constituted by an overflow pipe 34 opening from the side of said tank and leading back to the melting pot. Means which are provided for maintaining the depth of the pool of molten ~074911 ma~erial in the space 12 above and between the rolls are constituted by an overflow or weir 36 ormed in one of the graphite plates 14, exc~ss material being returned ~o the melting pot through a down pipe 38 with which said over:Low or weir communicates.
Referring now to Figure 5, this view illustrates a further possible modification in which the pool of molten metal is not held in a space defined by the surfaaas of the two rolls but in a chamber generally indicated ~0 mounted above the rolls.
The chamber has an overflow aperture 42 in an e~nd wall which determines the static head o molten metal. In thls case the molten metal i~ fed to the gap between the rolls through an elongate feed channel 44 extending the full length of the rolls.
A wear rssistant skirt 46 extends below the lower end of the feed channel and bears against the surfaces of the two rolls. (The graphite and plates 14 of Figures 1 and 4 are not shown in Figure 5. They may or may not be required).
POSSIBLE MODIFICATIONS
Various other modifications may be made. For example, the respective plates which in the Figure 1 and Figure 4 constructions enclose the containing space for holding the molten material above and 2~7~19~.1 between the rolls need not necessarily be acted upon, or directly acted upon, by sprin~ means. A
system of levers could be arranged to apply the required forces to said plates, sa:ld levers being 5acted on either by respective springs or by weights acting through respective bell crank leverQ to apply the required lateral forces.
Other means may be provided for automatically maintaining the solidification o the strip 10substantially at the po ition shown in full lines in Figure 2. For example, there could be provided means for monitoring the power consumption of the roll drive motor and means for increasing the driven speed o the rolls in response to a 15significant increase of electria power consumption.
Provision may be made for 'after cooling' of the strip, that i9 to say for the cooling of the strip by a water or other f luid bath or by spray a*ter the strip has exited from the rolls.
20The rolls could conceivably be cooled by a liqu:Ld other than water, or even by vapour, pumped through the hollow interior of each roll.
Although the machine has been described as being for the production of metal strip, it will be 25understood that with suitable adjustments of the temperature controls and drive controls it could be d .~ t used for the production of thermoplas~ics strip, for axample polycarbonates and acryllcs.
Claims (11)
1. A strip casting machine including a pair of rolls, means for supplying molten material to a space between the rolls, the spacing of which defines a gap through which the material is to be fed, means for cooling said rolls whereby to cool the molten material carried into the gap, and means for driving said rolls in contra-rotation to control the feed of the material through said gap.
2. A strip casting machine according to claim 1, in which the means for cooling the pair of rolls are interior spaces within said rolls for the circulation of a cooling fluid.
3. A strip casting machine according to claim 1, in which the means for driving the rolls includes means for monitoring the power consumption of a drive motor, and means for increasing the driven speed of the rolls in response to an increase of power consumption.
4. A strip casting machine according to claim 1, in which means are provided for sensing the force tending to separate the rolls during the operation of the machine, and for increasing the driven speed of the rolls in response to an increase in the force tending to separate said rolls.
5. A strip casting machine according to claim 1, including a containing space for holding the molten material above and between the rolls, said space being enclosed at opposite ends by respective plates urged into sliding engagement with end surfaces of said rolls.
6. A strip casting machine according to claim 5, in which the plates at the opposite ends of the rolls are urged into sliding engagement with the end surfaces of the rolls by spring means.
7. A strip casting machine according to claim 1, in which adjustment means are provided whereby the distance between the two rolls is adjustable.
8. A strip casting machine according to claim 1, in which means are provided for maintaining a pool of molten material above and between the two rolls at a substantially constant level.
9. A strip casting machine according to claim 8, in which the means for maintaining the level of said pool of molten material comprise a dip-probe and a solenoid operated valve actuated by said probe.
10. A strip casting machine according to claim 8, in which the means for maintaining the level of said pool of molten material comprise means for feeding the molten material to the pool at a rate greater than that at which the material is fed between the rolls, and overflow means for returning excess material from the pool.
11. A strip casting machine according to claim 8, in which the means for maintaining the level of the pool of molten material above and between the two rolls comprise means for feeding the molten material to the pool at a rate greater than that at which the material is fed between the rolls, and overflow means for returning excess material from said pool, and in which a holding tank is provided for feeding the molten material to the pool of material, there being means for maintaining the depth of molten material in said holding tank comprising means for feeding the material to said tank at a rate greater than that at which the material is fed between the rolls, and overflow means in said tank for returning excess material therefrom.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919116657A GB9116657D0 (en) | 1991-08-01 | 1991-08-01 | Strip casting machine |
| GB9116657.9 | 1991-08-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2074911A1 true CA2074911A1 (en) | 1993-02-02 |
Family
ID=10699378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2074911 Abandoned CA2074911A1 (en) | 1991-08-01 | 1992-07-29 | Strip casting machine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0526169A1 (en) |
| AU (1) | AU2075292A (en) |
| CA (1) | CA2074911A1 (en) |
| GB (1) | GB9116657D0 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2783895A (en) * | 1994-07-08 | 1996-02-09 | Ipsco Inc. | Dual tundishes for use with twin-roll caster |
| CN106424615A (en) * | 2016-07-13 | 2017-02-22 | 江苏东顺新能源科技有限公司 | Cooling device of lead plate roller |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3323749A1 (en) * | 1983-07-01 | 1985-01-03 | Norddeutsche Affinerie AG, 2000 Hamburg | METHOD FOR REGULATING THE BATH MIRROR LEVEL OF A METAL MELT |
| JP2697908B2 (en) * | 1989-08-03 | 1998-01-19 | 新日本製鐵株式会社 | Control device of twin roll continuous casting machine |
| FR2656550A1 (en) * | 1989-12-29 | 1991-07-05 | Siderurgie Fse Inst Rech | DEVICE FOR CONTINUOUS CASTING OF LIQUID METAL INTO THIN STRIPS BETWEEN TWO CYLINDERS. |
-
1991
- 1991-08-01 GB GB919116657A patent/GB9116657D0/en active Pending
-
1992
- 1992-07-28 EP EP92306892A patent/EP0526169A1/en not_active Withdrawn
- 1992-07-29 CA CA 2074911 patent/CA2074911A1/en not_active Abandoned
- 1992-07-31 AU AU20752/92A patent/AU2075292A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU2075292A (en) | 1993-02-04 |
| GB9116657D0 (en) | 1991-09-18 |
| EP0526169A1 (en) | 1993-02-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |