EP0080997B1 - Dispositif pour la coulée continue de métaux - Google Patents

Dispositif pour la coulée continue de métaux Download PDF

Info

Publication number
EP0080997B1
EP0080997B1 EP82890174A EP82890174A EP0080997B1 EP 0080997 B1 EP0080997 B1 EP 0080997B1 EP 82890174 A EP82890174 A EP 82890174A EP 82890174 A EP82890174 A EP 82890174A EP 0080997 B1 EP0080997 B1 EP 0080997B1
Authority
EP
European Patent Office
Prior art keywords
region
nozzles
openings
slider plate
plate
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
Application number
EP82890174A
Other languages
German (de)
English (en)
Other versions
EP0080997A1 (fr
Inventor
Manfred Dipl.-Ing. Haissig
Josef Lothmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Haissig Manfred Dipl-Ing
Zimmermann and Jansen GmbH
Original Assignee
Zimmermann and Jansen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3572069&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0080997(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Zimmermann and Jansen GmbH filed Critical Zimmermann and Jansen GmbH
Publication of EP0080997A1 publication Critical patent/EP0080997A1/fr
Application granted granted Critical
Publication of EP0080997B1 publication Critical patent/EP0080997B1/fr
Expired legal-status Critical Current

Links

Images

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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
    • B22D11/047—Means for joining tundish to mould
    • 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
    • B22D41/42—Features relating to gas injection

Definitions

  • the present invention relates to a device for the horizontal continuous casting of metals, in particular steels.
  • Such devices usually comprise a container holding the molten metal, which has in the lower region of its wall an outflow nozzle through which the metal flows into a substantially horizontally arranged mold, from which the metal strand is generally drawn off by mechanical means.
  • An outflow channel is used to transfer the liquid metal from the container into the mold. in the form of a mouthpiece made in one piece with the container and made of refractory material which extends into the mold.
  • such a device is described in FR-A-1 181 408, in which a container for the molten metal is connected via a vertical outflow opening to a horizontally arranged pouring channel with a subsequent horizontal mold.
  • the heatable pouring channel located below the outflow opening has an opening on the side facing away from the casting mold and is for receiving a horizontally displaceable sealing plug which passes through this opening and which releases or closes the vertical outflow opening of the melt container and the pouring channel in the desired manner educated.
  • the closure When the closure is open, the molten metal flows out of the melt container vertically and, with a sharp change in direction, flows into the horizontally arranged pouring channel and the subsequent continuous casting mold.
  • the sealing plug which is adapted to the inner shape of the pouring channel, is inserted horizontally into the pouring channel and closes the opening between the melt container and the pouring channel and the pouring channel itself.
  • shut-off device designed as a slide and having a horizontal slide plate as a closure element and also arranged in the vertical outflow channel.
  • a porous part which essentially corresponds to the dimension of the discharge nozzle between the melt container and the mold and which, when the slide plate is in the closed position, is aligned with and fed by the discharge nozzle a gas can be supplied via a line.
  • the gas is finely distributed in the porous part of the slide plate, keeps the molten metal constantly in motion in the form of rising bubbles and prevents it from penetrating into easily addable areas and parts of the slide. If the molten metal is hot and thin enough, an inert gas, such as Argon supplied, which ensures the desired displacement of the metal from sensitive areas of the slide.
  • the system switches to the supply of oxygen or oxygen-containing gas, as a result of which the metal heats up in this area as a result of the oxidation of a small proportion of the metal and solidifies there is avoided by parts of the metal in the area of the movable slide plate.
  • the supply of the gases does not cause any problems since, due to the horizontal arrangement of the slide plate and the surface of its porous gas supply part, the ferrostatic pressure of the metal located above the slide in the container is the same in all parts of the cross section of the outflow nozzle.
  • the invention has for its object to provide a device for horizontal continuous casting, which comprises a closure member for interrupting the flow of cast metal, which is formed by a substantially vertically arranged slide, and in which to avoid disturbances in the region of the closure member Means for supplying inert or oxygen (containing) gas is provided.
  • the invention relates to a device for the continuous casting of metals, in particular steels, which has a container for the molten metal to be cast, at least one outflow channel in the region of the bottom of the container in connection with at least one horizontal continuous casting mold and at least one outflow channel arranged in the channel
  • Closure member comprises, and is characterized in that on the slide plate of an essentially horizontally guided outflow channel inclined to, essentially vertically, arranged slide on its side facing the melt container, in the region of the edge zone of the in the closed position of the slide plate the metal area to be cast in contact with the surface area and / or in the area of the opening tion, preferably bore, the head plate of the slide at least one opening or nozzle for supplying a gaseous medium, preferably oxygen and / or argon, is arranged with a tangential outflow direction.
  • a gaseous medium preferably oxygen and / or argon
  • a plurality of such openings or nozzles having such a tangential outflow direction are advantageously arranged at the specified positions of the slide plate and the top plate.
  • These gas feeds can also be formed by capillaries, channels, nozzle openings or the like.
  • tangential means that the gases on the one hand leave the respective surface of one of the parts of the closure element mentioned tangentially or at a flat or acute angle, and on the other hand that their outflow direction is essentially parallel to the corresponding part of the boundary line of the area to be flushed by the gas runs.
  • the outflow direction although essentially tangential, can advantageously be directed outwards, ie against the periphery of the arrangement.
  • the surface of the slide plate is preferably circular and has an edge boundary that is essentially parallel and tangential.
  • the slide plate are arranged in pointed, preferably 3 to 45 degree, in particular 10 to 30 degree, angle penetrating openings or nozzles.
  • this wall tangentially penetrating openings or nozzles with an obliquely directed towards the surface of the slide plate, preferably an angle of 3 to 75 ° , in particular from 10 to 60 °, including the outflow direction.
  • the penetration of melt between the displaceable and firmly arranged parts of the closure member and the solidification of metal at these points are reliably switched off, even if the melt should have cooled too much.
  • all openings or nozzles on the top plate and / or slide plate have outflow directions in the same direction. This causes a kind of spiral circular movement of the melt with a tendency away from the area of the slide.
  • the openings or nozzles of the slide plate can all have the same direction of outflow and the openings of the nozzles in the top plate can also each have the same direction, but the flow direction of the gases on the slide plate is opposite.
  • Another variant provides that adjacent openings or nozzles on the top plate and / or slide plate have outflow directions facing each other.
  • An embodiment which has proven to be favorable for the uniformity of the gas supply over the cross-section to be purged and thus the metal movement in the entire area of the slide is that in the lower area, preferably in the lower half, of the surface area in contact with the molten metal Slider plate and / or in the lower region of the opening in the head plate are preferably arranged by 10 to 100% more openings or nozzles than in the upper region, preferably in the upper half, of the opening and / or of the surface region.
  • a porous stopper which can be flowed through by at least one line and can flow through gaseous medium and is optionally only partially surrounded by the tangential outflow direction, is arranged.
  • An embodiment has proven to be advantageous in which the openings or nozzles with the tangential outflow direction are arranged only in the edge zone of the lower region.
  • the porous stopper can be arranged in an opening penetrating the slide plate, preferably a bore, or in a recess of the slide plate facing the molten metal.
  • An embodiment variant is preferred in which a preferably cylindrically shaped recess extending into the region of the edge zone is arranged on the slide plate in its surface area in contact with the molten metal in the closed position, the boundary wall of openings or nozzles for feeding in gaseous media is penetrated with an essentially tangential and preferably directed against the molten metal outflow direction.
  • the container 1 shown only partially in FIG. 1 for the molten metal 1 a to be cast has in its lower region a substantially horizontal outlet channel 2 connecting this container 1 to the horizontal, also only partially shown, continuous casting mold 4.
  • a pressure cylinder plate slide 3 of which the top plate 10 and the divided slide plate 20 are shown enlarged.
  • the fixed head plate 10 which is made of highly refractory material, is arranged facing the melt container and has a flow opening 11, the wall 12 of which is penetrated by the gas supply nozzles 13 having a tangential outflow direction.
  • relatively more nozzles 13 were arranged than in the upper area 11 a. The gas emerging from these nozzles 13 continuously displaces the melt from the area of the slide plate 20.
  • the displaceable slide plate 20 also made of refractory material, in the embodiment shown divided, is arranged, one part of which has a flow opening 20a which, when the slide 3 is in the open position, with the connecting channel 2 or the outflow nozzle and aligned with the bore 11 of the head plate 10.
  • the tangentially opening nozzles 23 are arranged in its peripheral or edge zone area are supplied with the pressurized flushing or oxidizing gas via an annular channel 28. The gas flowing out tangentially keeps the melt in the area of the slide plate 10 in motion and continuously displaces it from the area thereof.
  • the front view shown in FIG. 2 of a part of the slide plate 20 shows the region 22 which is delimited by an interrupted circular line 22b and which is in contact with the molten metal 1a when the slide plate 20 is in the closed position or from its corresponding part.
  • the outflow openings of the nozzle 23 for the tangential supply of the gases are arranged in the edge zone 22a of this region 22.
  • more tangential nozzles are arranged in the lower region 22c than in the upper region 22d. This results in a particularly good compensation for the differences in the ferrostatic pressure occurring over the cross section of the horizontal outflow channel 2 (FIG. 1) and thus a uniform flushing of the sensitive area of the slide.
  • a porous stopper 25 (shown in dash-dot lines) seated in a recess of the slide plate 20 can be provided, from the center of the area 22 and surrounded by the nozzle openings 23, from which, also fed by Broken lines indicated supply line 27, the gases are introduced into the molten metal 1 over a large area and very finely distributed.
  • the porous stopper 25 is also arranged in the upper partial region 22d of the slide 20, but there are no gas supply nozzles with an essentially tangential outflow direction arranged in this upper part; the porous stopper 25, for example made of zirconium oxide, takes on their task.
  • the gas supply nozzles 23, which are essential to the invention and have a tangential outflow direction, are arranged in the lower region 22c, so that even with this embodiment variant, uniform flushing of the overall cross section is ensured despite the vertical arrangement of the slide plate.
  • FIG 5 shows the section 22 of the slide plate 20 of another preferred embodiment of the device according to the invention, which is in contact with the melt 1 a in the closed position, in section.
  • the gaseous medium is supplied via the ring channel 28 and the nozzles 23 penetrating tangentially through the cylindrical boundary wall 24a of the recess 24 in the slide plate 20.
  • the boundary wall 24a of the recess 24 is located in the area of the edge zone 22a of the area 22 which is in contact with the molten metal 1 when the slide plate 20 is in the closed position, so that in this embodiment as well, the effect according to the invention of flushing the sensitive zones of the slide with gas is achieved.
  • the slide plate 20 can be provided in a completely analogous manner.

Claims (10)

1. Dispositif de coulée continue de métaux, en particulier d'aciers, qui comprend un récipient (1) pour le métal liquide fondu (1 a) à couler, au moins un canal de sortie (2) communiquant, au voisinage du fond du récipient, avec au moins une lingotière horizontale de coulée continue (4) et au moins un organe de fermeture (3) disposé dans le canal (2), caractérisé en ce que sur le registre (20) d'une vanne coulissante (3) disposée sensiblement verticalement dans un canal de sortie (2) s'étendant sensiblement horizontalement, en étant inclinée sur celui-ci et sur la face du registre orientée vers le récipient à bain fondu (1) et au voisinage de la zone marginale (22a) de la portion de surface (22) en contact avec le métal à couler (la) en position d'obturation du registre (20) et/ou au voisinage de l'orifice (11 ) formant de préférence perçage de la plaque de tête (10) de la vanne coulissante (3), il est prévu au moins un orifice ou une busette (23, 13) pour l'amenée d'un fluide gazeux, de préférence de l'oxygène et/ou de l'argon, à direction d'écoulement tangentielle.
2. Dispositif selon la revendication 1, caractérisé en ce qu'au voisinage de la zone marginale (22a) de la portion de surface (22) du registre (20), se trouvant en contact avec le bain fondu de métal ( 1 a) sont disposés des orifices ou busettes (23) présentant des directions sensiblement parallèles et tangentielles à sa limite de bord (22b) de préférence circulaire et traversant la surface (21 ) du registre (20) suivant un angle aigu, de préférence de 3 degrés à 45 degrés et en particulier de 10 degrés à 30 degrés.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que dans la paroi ( 12) de l'orifice ( 11 ), de préférence perçage, traversant la plaque de tête (10) et dans sa région orientée vers le registre adjacent (20), sont disposés des orifices ou busettes (13) traversant tangentiellement cette paroi (12) et à direction d'écoulement de sortie orientée obliquement par rapport à la surface (21 ) du registre (20) et formant de préférence un angle de 3° à 75° et en particulier de 10° à 60°.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que tous les orifices ou busettes (13, 23) sur la plaque de tête (10) et/ou le registre (20) présentent des directions d'écoulement de sortie de même sens.
5. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que respectivement des orifices ou busettes (13, 23), juxtaposés sur la plaque de tête (10) et/ou le registre (20), présentent des directions d'écoulement de sortie orientées respectivement l'une vers l'autre.
6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que dans la région inférieure (22c), de préférence dans la moitié inférieure de la portion de surface (22) du registre (20) se trouvant en contact avec le bain fondu de métal (1a) et/ou dans la région inférieure (11 b) de l'orifice (11) dans la plaque de tête (10) sont prévus de 10% à 100% plus d'orifices ou de busettes (13,23) que respectivement dans la région supérieure (22d, 11a), de préférence dans la moitié supérieure de l'orifice (11) et/ou de la portion de surface (22).
7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce que dans le registre (20) à l'intérieur de la portion de surface (22) se trouvant en contact avec le métal liquide (1a) en position de fermeture, est disposé, en étan préférence décalé depuis le centre de la portion de surface vers la région supérieure (22d), un tampon poreux (25) pouvant être traversé par un fluide gazeux amené par l'intermédiaire d'au moins une conduite (27) et entouré éventuellement seulement partiellement par les orifices ou busettes (23) présentant des directions d'écoulement de sortie tangentielles.
8. Dispositif selon la revendication 7, caractérisé en ce que les orifices ou busettes (23), présentant des directions d'écoulement de sortie tangentielles, sont disposés seulement dans la zone marginale (22a) de la région inférieure (22c).
9. Dispositif selon la revendication 7 ou 8, caractérisé en ce que le tampon (25) est disposé dans un évidement du registre (20) orienté vers le bain fondu de métal (1a).
10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que dans le registre (20), dans sa portion de surface (22) se trouvant en contact avec le bain fondu de métal (1a) en position d'obturation, est disposé un évidement (24) de préférence conformé cylindriquement et s'étendant jusqu'au voisinage de la zone marginale (22a) et dont la paroi de limitation (24a) est traversée par des orifices ou busettes (23) pour l'amenée de fluides gazeux, avec des directions d'écoulement de sortie sensiblement tangentielles et orientées de préférence en direction du bain fondu de métal (1a).
EP82890174A 1981-11-27 1982-11-23 Dispositif pour la coulée continue de métaux Expired EP0080997B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT5112/81 1981-11-27
AT511281A ATA511281A (de) 1981-11-27 1981-11-27 Vorrichtung zum stranggiessen von metallen

Publications (2)

Publication Number Publication Date
EP0080997A1 EP0080997A1 (fr) 1983-06-08
EP0080997B1 true EP0080997B1 (fr) 1985-11-27

Family

ID=3572069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82890174A Expired EP0080997B1 (fr) 1981-11-27 1982-11-23 Dispositif pour la coulée continue de métaux

Country Status (4)

Country Link
EP (1) EP0080997B1 (fr)
JP (1) JPS5893543A (fr)
AT (1) ATA511281A (fr)
DE (1) DE3267714D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT383529B (de) * 1985-10-24 1987-07-10 Voest Alpine Ag Einrichtung zum vergiessen von schmelzen
DE68927834T2 (de) * 1989-06-01 1997-10-02 Shinagawa Refractories Co Plattenförmiger stein oder verteilerstein zum einblasen von gas für geschmolzenes metall
US5613545A (en) * 1991-11-12 1997-03-25 Shinagawa Refractories Co. Ltd. Inert gas injecting plate brick or insert nozzle brick for use in a sliding gate valve apparatus of molten metal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6918019U (de) 1968-05-09 1970-05-06 Asieries Reunies De Burbach Ei Vorrichtung zum giessen von metallen, insbesondere von stahl, in kokillen
DE2462292A1 (de) 1973-03-01 1977-02-17 Uss Eng & Consult Gasdurchlaessiger sperrschieber eines bodenauslassventils an einem giessgefaess
DE2811546A1 (de) 1977-03-18 1978-09-21 Sumitomo Metal Ind Verfahren und vorrichtung zum kontinuierlichen giessen von stahl

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB801819A (en) * 1956-03-22 1958-09-24 Bram Joel Franklin Improvements in the continuous forming of molten materials
CH478613A (de) * 1968-07-12 1969-09-30 Interstop Ag Schiebeverschluss für mit einer Bodenausgussöffnung versehene Behälter zum Giessen von flüssigen Metallen, insbesondere Stahl
US3809146A (en) * 1972-02-18 1974-05-07 Steel Corp Method of opening an intermediate vessel nozzle for continuous casting
DE2836409C2 (de) * 1978-08-19 1982-07-22 Stopinc AG, Zug Vorrichtung zum Einführen von Behandlungsstoffen in die in einem metallurgischen Gefäß enthaltene Schmelze

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6918019U (de) 1968-05-09 1970-05-06 Asieries Reunies De Burbach Ei Vorrichtung zum giessen von metallen, insbesondere von stahl, in kokillen
DE2462292A1 (de) 1973-03-01 1977-02-17 Uss Eng & Consult Gasdurchlaessiger sperrschieber eines bodenauslassventils an einem giessgefaess
DE2811546A1 (de) 1977-03-18 1978-09-21 Sumitomo Metal Ind Verfahren und vorrichtung zum kontinuierlichen giessen von stahl

Also Published As

Publication number Publication date
JPS5893543A (ja) 1983-06-03
DE3267714D1 (en) 1986-01-09
EP0080997A1 (fr) 1983-06-08
ATA511281A (de) 1987-03-15

Similar Documents

Publication Publication Date Title
DE2709727C3 (de) Einrichtung zum Auswechseln von Gießrohren an Gießgefäßen beim Stranggießen
DE4023484C2 (fr)
DE2455181A1 (de) Verfahren und vorrichtung zum vergiessen von metallen aus giessgefaessen, deren bodenauslassoeffnung durch einen gleitschieber einstellbar ist
EP0254909A1 (fr) Busette de coulée réfractaire
DE2902096C2 (fr)
DE1951447C3 (de) Ausflußschieberverschluß für Gefäße zum Vergießen von Metallen
DE3512907A1 (de) Ausgusshuelse fuer einen metalschmelze enthaltenden behaelter
DE2355015A1 (de) Giessvorrichtung mit horizontaler gleitkokille
DE1483667A1 (de) Verfahren und Vorrichtung zum Stranggiessen von Stahl
DE3924001A1 (de) Doppelrollen-stranggiessmaschine
DE4138655C2 (de) Ausflußregler für Zwischengefäß
EP0080997B1 (fr) Dispositif pour la coulée continue de métaux
DE3331483C2 (de) Einrichtung für feuerfeste Platten von Schieberverschlüssen
DE1471914B2 (de) Vorrichtung zur herstellung von tafelglas
DE2738587C2 (de) Verstellvorrichtung für eine Abschirmvorrichtung zum Gießstrahlschutz
DE2261296C3 (de) Gießbehalter fur Metall
DE3342071C2 (de) Vorrichtung zum Abschirmen eines metallischen Gießstrahls
DE1213965B (de) Vorrichtung zum kontinuierlichen Giessen von Baendern aus Metall oder anderen schmelzbaren Werkstoffen
DE2607379B2 (de) Vorrichtung zum spuelen von stahl
DE2613363A1 (de) Stranggussmaschine
DE2319004A1 (de) Stopfenbetaetigungseinrichtung fuer giesspfanne
DE4032787A1 (de) Vorrichtung zum anschliessen eines giessrohres an den ausguss eines metallschmelze enthaltenden gefaesses
DE2361344A1 (de) Verfahren und vorrichtung zum eingiessen von metall in eine stranggiesskokille
DE102008005727B3 (de) Zuführeinrichtung für eine Metallschmelze und eine mit einer solchen Vorrichtung ausgestattete Bandgießeinrichtung
AT349666B (de) Vorrichtung zum auswechseln von giessrohren

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI SE

17P Request for examination filed

Effective date: 19830712

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ZIMMERMANN & JANSEN GMBH

Owner name: HAISSIG, MANFRED, DIPL.-ING.

ITF It: translation for a ep patent filed

Owner name: DE DOMINICIS & MAYER S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI SE

REF Corresponds to:

Ref document number: 3267714

Country of ref document: DE

Date of ref document: 19860109

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: DIDIER-WERKE AG

Effective date: 19860825

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19871113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19871124

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

BERE Be: lapsed

Owner name: ZIMMERMANN & JANSEN G.M.B.H.

Effective date: 19871130

Owner name: HAISSIG MANFRED

Effective date: 19871130

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state
27W Patent revoked

Effective date: 19880124

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 82890174.4

Effective date: 19880913