[go: up one dir, main page]

EP0058999A1 - Récipient basculant pour le traitement de bains de fonte de moulage - Google Patents

Récipient basculant pour le traitement de bains de fonte de moulage Download PDF

Info

Publication number
EP0058999A1
EP0058999A1 EP82200084A EP82200084A EP0058999A1 EP 0058999 A1 EP0058999 A1 EP 0058999A1 EP 82200084 A EP82200084 A EP 82200084A EP 82200084 A EP82200084 A EP 82200084A EP 0058999 A1 EP0058999 A1 EP 0058999A1
Authority
EP
European Patent Office
Prior art keywords
vessel
treatment
cast iron
opening
chamber
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.)
Granted
Application number
EP82200084A
Other languages
German (de)
English (en)
Other versions
EP0058999B1 (fr
Inventor
Hubertus A. J. M. Bisschop
Hendrikus Meijers
Jozef J. M. Van Der Randen
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.)
GEA Group AG
Evonik Operations GmbH
Original Assignee
SKW Trostberg AG
Metallgesellschaft AG
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
Application filed by SKW Trostberg AG, Metallgesellschaft AG filed Critical SKW Trostberg AG
Priority to AT82200084T priority Critical patent/ATE15076T1/de
Publication of EP0058999A1 publication Critical patent/EP0058999A1/fr
Application granted granted Critical
Publication of EP0058999B1 publication Critical patent/EP0058999B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron

Definitions

  • the invention relates to a tiltable vessel for treating cast iron melts with substances inducing spheroidal graphite formation.
  • Spheroidal graphite-inducing substances are known in the prior art.
  • a vessel of the type mentioned known from DE-AS 22 16 796 and designed as a converter which can be tilted about a transverse axis, a chamber is attached to the bottom surface. This chamber is used to hold treatment additives and is loaded and closed from the outside.
  • the chamber walls have openings for the passage of the molten metal and the evaporating additives.
  • the converter opening which serves as a filling and tapping opening, can be closed with a lid. When the converter is in the horizontal position, the melt is filled in, but does not come into contact with the chamber contents.
  • the converter is pivoted into the vertical position.
  • the workload for loading, care and maintenance of the chamber has turned out to be disadvantageous.
  • the treated melt has to be poured into an intermediate transport vessel and poured from it into the molds.
  • a cylindrical vessel for treating metal melts which can be rotated horizontally about the cylinder axis, has a filling and tap opening, and an interior which is separated by a grate and can be closed and treated from the outside with treatment agents having.
  • treatment vessels have not been sufficient in all cases, since suitable intermediate vessels which are to be arranged under the drum ladle are additionally required as pouring ladles.
  • the work involved in material and maintenance of the grate and lock is uneconomical.
  • the present invention has for its object to avoid the aforementioned and other disadvantages of previously known methods and devices of the type described.
  • the invention is based on a refractory-lined, tiltable vessel for treating cast iron melts with substances inducing spheroidal graphite formation, with a chamber arranged in the interior on the bottom of the vessel for receiving the treatment agent and a vessel opening which can be closed with a lid for charging and emptying.
  • the invention is characterized by an essentially cylindrical vessel with a partition wall arranged in the interior on a cylinder bottom and forming a partition with the vessel wall, which is open towards the top of the vessel opening, the vessel being horizontally rotatable about a longitudinal axis and about one The transverse axis can be tilted in the vertical or horizontal position.
  • the treatment vessel according to the invention is generally cylindrical in shape.
  • a steel cylinder jacket is closed on both sides with riveted bottoms and thus forms a drum.
  • the longitudinal axis of the cylindrical treatment vessel according to the present invention can run in the middle.
  • the cylinder axis is the axis of rotation.
  • the axis expediently runs off-center.
  • the transverse axis of the cylindrical vessel according to the invention runs in the bisecting plane of the vessel.
  • the axial direction is preferably radial.
  • the transverse axis can also run in the direction of a secant.
  • axial pins or pivots are attached to the cylinder jacket or the cylinder bottoms.
  • the longitudinal axis can also extend outside the cylindrical vessel.
  • a bearing block carrying the pivot is attached to the two cylinder bases, the pivot lying outside the projection of the surface line.
  • the treatment vessel can be hung horizontally in a suitable crane hook frame or transport device and rotated about this longitudinal axis.
  • the rotation in a simple manner, for. B. with a chain hoist, which preferably engages the lower surface line in the middle.
  • the treatment vessel according to the invention has an opening in the cylinder jacket in the region of the upper cylinder base in relation to the vertical position. This serves to fill the treatment agent into the chamber and to fill the cast iron melt. If this opening can also serve as a tap opening for the cast iron melt treated, it is nevertheless more advantageous for the vessel to be in the region equip the opening with a pouring siphon.
  • the pouring siphon enables easy and slag-free pouring of the treated cast iron melt directly into the molds.
  • the siphon also serves to compensate for the z.
  • B. Magnesium treatment resulting overpressure with the lid closed. The vessel lid is kept closed by means known per se, such as swivel closures.
  • the vessel opening has a slag weir in the region of the upper cylinder base in the vertical position in its edge zone. With this slag weir, the cast iron melt treated can be easily removed by slightly tilting or tilting the vessel around the transverse axis below the horizontal line when the lid is open or removed.
  • a partition is drawn off-center at the bottom of the vessel, based on the vertical position.
  • the partition wall like the lining of the vessel, is made of refractory material.
  • This partition is expediently a flat or curved plate.
  • the plate advantageously has a slight inclination towards the vessel wall and forms an angle of 45 to 90, preferably 60 to 85 degrees with the vessel bottom in the chamber. This slight inclination prevents the treatment agent from slipping out during the pivoting-in process from the vertical filling position into the horizontal position, in which the melt is filled.
  • cylindrical treatment vessel according to the invention is explained in more detail and by way of example with reference to the drawings and a cast iron treatment with a magnesium carrier is described.
  • FIG. 1 shows a perspective view of a cylindrical vessel 1 with a steel jacket 2.
  • the bottoms 3 and 4 close the steel cylinder 2, the lower cylinder bottom 4 being widened beyond the steel jacket in order to ensure better stability when the vessel is set down.
  • “L” denotes a longitudinal axis of the vessel, which coincides with the cylinder axis in the case shown.
  • the transverse axis is labeled "Q”.
  • Suitable drive devices are attached to the axes.
  • the journal of the longitudinal axis "L” can be provided with a gear and the vessel can be rotated horizontally via a motor gear.
  • semicircular ring gears can also be provided on the vessel jacket.
  • journal of the transverse axis "Q" can be equipped with suitably dimensioned gears.
  • a particularly expedient drive device consists in that the axle journals of the transverse axis "Q" are mounted in the ends of a toothed ring which are formed in a semicircular manner and surround the vessel jacket.
  • the sprocket rotates around the horizontal longitudinal axis, while the tilting process of the vessel into the horizontal or vertical position is effected via a gear drive.
  • a pouring siphon is attached to the vessel opening 7.
  • 6 denotes a slag weir, which is recessed in the edge zone of the upper cylinder base 3.
  • the vessel opening 7 can be closed by a suitably designed lid, not shown in the figure.
  • the plate-shaped partition 9 forms with the vessel wall an open chamber 10 which is filled with treatment agent 11.
  • the vessel For the treatment of a cast iron melt with substances inducing spheroidal graphite formation, such as magnesium carriers, the vessel is generally brought into the vertical position with the lid removed.
  • the magnesium carrier is then filled into the chamber 9 located below the opening, which is open at the top, via the vessel opening 7.
  • a funnel-like device is expediently used in order to ensure safe placement of the treatment agent in the chamber.
  • the vessel is then pivoted from the vertical position into the horizontal position. This brings the chamber into a position approximately in the upper third of the horizontal cylinder.
  • the treatment agent can be introduced into the open chamber by means of a lance-shaped injector, for example, the vessel not having to be changed in its horizontal position. With this filling process, a movement process of the treatment vessel can be saved.
  • the cast iron melt is then introduced via the opening 7 and the vessel is filled to approximately two thirds of its volume.
  • the bath level does not come into direct contact with the magnesium carrier.
  • the lid closed the vessel is now swiveled rapidly into the vertical position within approximately 2 to 5 seconds and the magnesium carrier is brought into contact with the entire melting volume. The reaction is complete within a few minutes.
  • the vessel is then pivoted into the horizontal position, the lid is removed and, when the vessel is inclined slightly below the horizontal, the melt is slagged off over the weir 6.
  • the treated and detoxified cast iron melt if necessary after prior inoculation, is then transferred from the vessel, which has then been brought back into the horizontal, directly into casting molds to give cast materials made of spheroidal graphite cast iron poured.
  • the emptied vessel is then immediately available for a new treatment process.
  • FIG. 2 the vessel according to the invention is shown in simplified longitudinal section.
  • a partition 9 is drawn into the lining 8 of the vessel bottom with a slight inclination to the vessel wall.
  • the chamber 10 thus open on one side is filled with treatment agent 11.
  • the bath level 12 of the cast iron melt has no direct contact with the treatment agent.
  • the vessel has hollow profiles attached to the cylinder jacket to enable the tilting movement into the horizontal / vertical position, e.g. Pipes or U profiles 13 on.
  • the gripper arms of a rotating device can engage in these profiles and rotate the cylinder about the transverse axis.
  • two profiles on the one lateral surface facing away from the vessel opening are sufficient for holding the cylinder.
  • greater gripping safety is achieved with two or four profiles, each lying opposite one another on the lateral surfaces.
  • the cylindrical treatment vessel of FIG. 3 has an axis of rotation extending outside the cylinder.
  • axle blocks 14 are attached to the cylinder bottoms, on which the axial pins 15 are seated, with which the vessel can be suspended in a transport device, such as a crane train.
  • a transport device such as a crane train.
  • the fastening device such as eyelet, a z. B. chain hoist, represented by chain 16.
  • a method of treating cast iron melts with spheroidal graphite induction has also been found Fabrics found using the treatment vessel according to the invention.
  • Suitable spheroidal graphite formers are, for example, magnesium-containing alloys based on nickel or ferrosilicon with magnesium proportions of between 1 and 50% or else pure magnesium. Furthermore, magnesium-containing pressed bodies or porous bodies impregnated with magnesium.
  • Magnesium master alloys expediently also contain rare earth metals such as cerium or cerium mixed metal. The latter can also be present as such separately from the magnesium master alloy.
  • the advantages of the vessel according to the invention can be seen in the fact that slagging problems in the treatment chamber and thus cleaning treatments with e.g. B. flux can be avoided. Short treatment times with high yields are achieved. Preheating of the vessel is also not necessary. Furthermore, no intermediate vessel between the melting furnace and the treatment vessel and between the treatment vessel and the casting vessel is required for the vessel according to the invention.
  • the vessel according to the invention advantageously enables a melt treatment, which can take place considerably after the filling process and also spatially elsewhere in the company.
  • the invention offers the advantages of a quasi one-pan system for treating, seeding, transporting and pouring the molten iron, a higher Mg yield, no need to cover the Mg carriers, practically smoke and light-free reaction, low temperature loss, no melt ejection, and no accumulation of residual iron.
  • a magnesium alloy with a grain size of 1 to 3 mm and in an amount of 1.5% by weight (based on the amount of cast iron) was introduced into the chamber of the treatment vessel at the bottom of the vessel by means of a funnel-shaped device through the vessel opening.
  • the alloy had the composition
  • the molten iron had the following composition:
  • the treatment vessel was then rotated from the horizontal position to the vertical position within 3 seconds.
  • the reaction was smooth, even, without expectoration, practically smoke and light-free and was completed in 65 seconds.
  • the vessel was then pivoted into the horizontal position and the melt was slagged off after removing the lid and slightly tilting the vessel below the horizontal line. In turn in the
  • Vaccination treatment with 0.2% by weight ferrosilicon (FeSi 75) was carried out in the horizontal position of the vessel.
  • the cast iron melt now had a temperature of 1,405 ° C. and was poured into molds by rotating the vessel about the longitudinal axis from the pouring siphon.
  • the analysis for the magnesium content showed 0.070%.
  • the vessel was then swiveled into the vertical position in just under 3 seconds and melt treatment was carried out quietly and without ejection in about 55 seconds.
  • the swiveling and rotating movement of the vessel for slagging and inoculation (0.1% FeSi 75) and pouring was carried out in accordance with the procedure in Example 1.
  • the pouring temperature when pouring into the molds was 1,395 ° C.
  • the residual magnesium content in the casting was found to be 0.068%, which corresponds to a Mg yield of approximately 70%.
  • the spheroidal graphite formation was 90%.
  • the number of graphite balls was found to be 300 per mm 2 .
  • the structure was 88% ferrite and 12% pearlite and was cementite-free.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Glanulating (AREA)
  • Coating With Molten Metal (AREA)
EP82200084A 1981-02-13 1982-01-26 Récipient basculant pour le traitement de bains de fonte de moulage Expired EP0058999B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82200084T ATE15076T1 (de) 1981-02-13 1982-01-26 Kippbares gefaess zur behandlung von gusseisenschmelzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813105200 DE3105200A1 (de) 1981-02-13 1981-02-13 Kippbares gefaess zur behandlung von gusseisenschmelzen
DE3105200 1981-02-13

Publications (2)

Publication Number Publication Date
EP0058999A1 true EP0058999A1 (fr) 1982-09-01
EP0058999B1 EP0058999B1 (fr) 1985-08-21

Family

ID=6124763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200084A Expired EP0058999B1 (fr) 1981-02-13 1982-01-26 Récipient basculant pour le traitement de bains de fonte de moulage

Country Status (6)

Country Link
US (1) US4396427A (fr)
EP (1) EP0058999B1 (fr)
AT (1) ATE15076T1 (fr)
CA (1) CA1184040A (fr)
DE (2) DE3105200A1 (fr)
ES (2) ES274387Y (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178593A3 (fr) * 1984-10-16 1986-07-30 Asea Ab Dispositif pour la coulée protégée et sans entraínement de scorie d'un bain de fusion à partir d'un récipient dans un four de coulée
FR2592325A1 (fr) * 1985-12-31 1987-07-03 Fischer Ag Georg Recipient pour le traitement d'alliages metalliques liquides.
RU2127320C1 (ru) * 1989-11-28 1999-03-10 Георг Фишер АГ Способ обработки расплава магнием

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016007724A1 (de) 2016-06-23 2017-12-28 Linde Aktiengesellschaft Verfahren und Vorrichtung zum Anbringen eines Messfühlers innerhalb einer Schüttung sowie Rohrreaktor mit einer Schüttung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698749A (en) * 1951-06-06 1955-01-04 John M Fishell Apparatus for introducing solid metal into molten metal
DE1815214A1 (de) * 1968-01-26 1969-12-11 Fischer Ag Georg Verfahren zur Einfuehrung von verdampfbaren Zusaetzen in eine Schmelze und Vorrichtung zur Durchfuehrung des Verfahrens
DE2514490A1 (de) * 1974-04-04 1975-10-23 Foseco Int Herstellung von gusseisen
FR2272776A1 (fr) * 1974-05-28 1975-12-26 Cit Alcatel
DE2530547B1 (de) * 1975-07-09 1976-11-04 Gevelsberger Stahlwerk, Heinrich Dieckerhoff, 5820 Gevelsberg Verfahren und vorrichtung zum herstellen von gusseisen mit kugelgraphit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955974A (en) * 1971-05-18 1976-05-11 Georg Fischer Aktiengesellschaft Apparatus and method for treating a metal melt with a vaporizable substance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698749A (en) * 1951-06-06 1955-01-04 John M Fishell Apparatus for introducing solid metal into molten metal
DE1815214A1 (de) * 1968-01-26 1969-12-11 Fischer Ag Georg Verfahren zur Einfuehrung von verdampfbaren Zusaetzen in eine Schmelze und Vorrichtung zur Durchfuehrung des Verfahrens
DE2514490A1 (de) * 1974-04-04 1975-10-23 Foseco Int Herstellung von gusseisen
FR2272776A1 (fr) * 1974-05-28 1975-12-26 Cit Alcatel
DE2530547B1 (de) * 1975-07-09 1976-11-04 Gevelsberger Stahlwerk, Heinrich Dieckerhoff, 5820 Gevelsberg Verfahren und vorrichtung zum herstellen von gusseisen mit kugelgraphit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178593A3 (fr) * 1984-10-16 1986-07-30 Asea Ab Dispositif pour la coulée protégée et sans entraínement de scorie d'un bain de fusion à partir d'un récipient dans un four de coulée
US4684109A (en) * 1984-10-16 1987-08-04 Asea Aktiebolag Melt-transfer device for the protected tapping of molten metal from one vessel to another
FR2592325A1 (fr) * 1985-12-31 1987-07-03 Fischer Ag Georg Recipient pour le traitement d'alliages metalliques liquides.
GB2185096A (en) * 1985-12-31 1987-07-08 Fischer Ag Georg Treatment vessel for treating molten metal alloys
GB2185096B (en) * 1985-12-31 1990-09-05 Fischer Ag Georg Treatment vessel for treating molten metal alloys
RU2127320C1 (ru) * 1989-11-28 1999-03-10 Георг Фишер АГ Способ обработки расплава магнием

Also Published As

Publication number Publication date
ES8400492A1 (es) 1983-10-16
DE3105200A1 (de) 1983-01-20
ES274387U (es) 1984-01-16
US4396427A (en) 1983-08-02
EP0058999B1 (fr) 1985-08-21
ES519138A0 (es) 1983-10-16
ES274387Y (es) 1984-08-16
ATE15076T1 (de) 1985-09-15
DE3265490D1 (en) 1985-09-26
CA1184040A (fr) 1985-03-19

Similar Documents

Publication Publication Date Title
DE1815214B2 (de) Kippbares Behandlungsgefäß zum Behandeln von Metall-Schmelzen durch Einbringen verdampfbarer Zusätze, insbesondere zum Herstellen von Eisen-Kohlenstoff-Gußwerkstoffen mit Kugelgraphit durch Einbringen von Reinmagnesium in die im Gefäß enthaltene Schmelze
DE2406480A1 (de) Verfahren zum raffinieren von stahl
EP0199714B1 (fr) Procédé pour la production de l'acier à partir de l'éponge de fer et installation pour la mise en oeuvre de ce procédé
EP0058999B1 (fr) Récipient basculant pour le traitement de bains de fonte de moulage
DE813581C (de) Schmelzofen fuer metallene und keramische Werkstoffe
DE8103908U1 (de) Kippbares gefaess zur behandlung von gusseisenschmelzen
DE1433401B1 (de) Vorrichtung zum Entgasen von Metallschmelzen
DE3704116A1 (de) Einrichtung zur manipulation einer impf-pfanne
DE3878507T2 (de) Gefaess und verfahren zum behandeln von metallschmelzen.
DE2514490C2 (de) Vorrichtung zur Behandlung einer Gußeisenschmelze
DE3644471C2 (fr)
DE2522472C3 (de) Kipppfanne zur Verarbeitung und zum Gießen von schmelzflüssigen Metallen
DE2141132C3 (de) Verfahren zur kontinuierlichen Herstellung einer Eisenschmelze für Gußeisen mit Kugelgrafit und Lichtbogenofen zur Durchführung dieses Verfahrens
DE2162100C3 (de) Geformter Impfmittelkörper zum Impfen von Gußeisenschmelzen
DE2633025A1 (de) Verfahren zur zugabe von pulverfoermigem material zu geschmolzenem metall
DE814161C (de) Anordnung zum Entleeren und Entschlacken bei elektrischen Hochfrequenzoefen
DE1433639A1 (de) Anlage und Verfahren zur Herstellung von Gusseisen mit Kugelgraphit
DE2530547B1 (de) Verfahren und vorrichtung zum herstellen von gusseisen mit kugelgraphit
DE609427C (de) Vorrichtung zum Giessen von hochprozentigen Ferrolegierungen
DE1920958A1 (de) Verfahren und Vorrichtung zum Frischen bzw. Feinen von Roheisen- bzw. Eisenlegierungschmelzen
AT217489B (de) Verfahren zur Verlängerung der Gebrauchsdauer der feuerfesten Auskleidung von Vorrichtungen für das Frischen von Roheisen sowie Konverter zur Durchführung des Verfahrens
DE1115466B (de) Verfahren und Vorrichtung zur Wiedergewinnung von Aluminium aus Aluminiumabfaellen
DE8103907U1 (de) Kippbares konvertergefaess fuer die behandlung von gusseisenschmelzen
DE2522472B2 (de) Kipppfanne zur verarbeitung und zum giessen von schmelzfluessigen metallen
DE7141284U (de) Behalter zum Transportieren von flussigem Metall, insbesondere Aluminium und dessen Legierungen

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): AT BE CH DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19830217

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

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

REF Corresponds to:

Ref document number: 15076

Country of ref document: AT

Date of ref document: 19850915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3265490

Country of ref document: DE

Date of ref document: 19850926

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19891215

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19891218

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19891221

Year of fee payment: 9

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19900131

Year of fee payment: 9

Ref country code: NL

Payment date: 19900131

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19900209

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19900215

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19900316

Year of fee payment: 9

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

Ref country code: GB

Effective date: 19910126

Ref country code: AT

Effective date: 19910126

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

Ref country code: SE

Effective date: 19910127

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

Ref country code: BE

Effective date: 19910131

Ref country code: CH

Effective date: 19910131

Ref country code: LI

Effective date: 19910131

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

Ref country code: NL

Effective date: 19910801

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910930

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: DE

Effective date: 19911001

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 82200084.0

Effective date: 19910910