[go: up one dir, main page]

EP0201602A1 - Anneau pour machines a filer - Google Patents

Anneau pour machines a filer Download PDF

Info

Publication number
EP0201602A1
EP0201602A1 EP85904861A EP85904861A EP0201602A1 EP 0201602 A1 EP0201602 A1 EP 0201602A1 EP 85904861 A EP85904861 A EP 85904861A EP 85904861 A EP85904861 A EP 85904861A EP 0201602 A1 EP0201602 A1 EP 0201602A1
Authority
EP
European Patent Office
Prior art keywords
ring
ceramic
flange
spinning
area
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
EP85904861A
Other languages
German (de)
English (en)
Other versions
EP0201602A4 (fr
EP0201602B1 (fr
Inventor
Yuzuru Nakano
Takeshi Yoshikawa
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.)
Kanai Juyo Kogyo Co Ltd
Original Assignee
Kanai Juyo Kogyo Co Ltd
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=15419813&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0201602(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kanai Juyo Kogyo Co Ltd filed Critical Kanai Juyo Kogyo Co Ltd
Publication of EP0201602A1 publication Critical patent/EP0201602A1/fr
Publication of EP0201602A4 publication Critical patent/EP0201602A4/fr
Application granted granted Critical
Publication of EP0201602B1 publication Critical patent/EP0201602B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H1/00Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/02Spinning or twisting machines in which the product is wound-up continuously ring type
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H7/00Spinning or twisting arrangements
    • D01H7/02Spinning or twisting arrangements for imparting permanent twist
    • D01H7/52Ring-and-traveller arrangements
    • D01H7/60Rings or travellers; Manufacture thereof not otherwise provided for ; Cleaning means for rings
    • D01H7/602Rings

Definitions

  • the invention relates to a ring for spinning and twisting machines.
  • the rings for spinning machines are made of carbon steel and subjected to a heat treatment by carboriding and hardening in order to achieve a surface of 800 to 900 Vickers hardness and a hardened depth of 0.4 to 0.5 mm.
  • the lifespan of the rings for spinning machines that were only subjected to the above heat treatment was 3 to 4 years in the area of spinning cotton and 1 to 3 years at most when spinning plastic fibers.
  • the shorter life of such carbon steel rings may be due to the fact that the ring temperature increases and the surface hardness decreases due to the frictional heat generated when the rotor slides on the ring flange, with the result that the sliding abrasion due to the passage of the runner rises.
  • Conventional rings also easily corrode with the result of premature peeling and abrasion, which often results in yarn breakage during spinning.
  • the object of the invention is accordingly to avoid the disadvantages shown, to create a ring for spinning and twisting machines, which has a high surface hardness, in which the surface is smooth, which is characterized by improved abrasion resistance and Heat resistance, with improved corrosion resistance and which is suitable for high-speed spinning, with higher productivity, a longer service life and the spinnability of a high-quality thread.
  • a ring for a spinning machine normally comprises a flange area, a neck area and a shaft area with a ring rail fitting area.
  • At least a partial area of the ring with which the rotor is in sliding contact is made of ceramic, or the surface is covered with ceramic material, this being Al 2 0 3 3 Zr0 2 , SiC, si 3 N 4 or the like, which has a crystal grain diameter of less than 3 / ⁇ m, after the grain wax sintering, a grain diameter of less than 10 / ⁇ m and a surface roughness less than 5 .
  • a ring with such a flange area has a high surface hardness, a smooth surface, better wear resistance, greater heat resistance and great resistance to corrosion.
  • the ring is suitable for high-speed operation of more than 20,000 revolutions per minute, is free of sparks during high-speed running, free of abrasion due to the grinding action of the ceramic material, ensures smooth operation of the rotor, leads to low spinning tension and thus reduced thread breakage, shows less fraying of the thread and has a longer life.
  • Fig. 1 shows a cross section through a preferred embodiment of a ring for a spinning machine according to the invention.
  • the ring 5 comprises a flange part 1, a neck region 2 and a shaft region 4 with a ring rail fitting region 3.
  • At least the part that is in contact with a rotor, that is to say the flange region 1 of the ring, is produced by casting in the desired shape, using ceramic grain material selected from oxide, carbide, nitride, boride or other groups, for example SiC, Si 3 N 49 Al 2 O 3 , Zr02, TiC, TiN, etc.
  • the ceramic flange thus obtained is subjected to fire treatment at a high temperature to have a hardness of 1000 to 3500 Hv and a grain diameter after growth of the crystal grain of less than 10 ⁇ m.
  • the neck region 2 and the shaft region 4, which carries the ring rail fitting region 3, consist of carbon steel, alloy steel, light metal or a high polymer material in the desired shape and are produced by mechanical processing or by casting molds.
  • a smooth surface finish is transferred to the surface of the ceramic flange described above by physical or mechanical finishing methods such as cylinder grinding, lapping or polishing, etc. so that the surface roughness is less than 5 ⁇ m and preferably less than 1 ⁇ m.
  • ceramic materials is not limited to the flange area of the ring, but it can be made entirely from the ceramic material.
  • FIG. 3A and 3B show a ring for a spinning machine, the flange area of which bears a ceramic coating layer.
  • This ring 5 consists of carbon steel, a steel alloy, light metal, plastic, composite materials or the like.
  • a ceramic coating layer 6 has been formed on the surface of the ring where it is in contact with the rotor by a coating method such as CVD (chemical vapor deposition method) including a plasma spraying method and an optical CVD, PVD (physical vapor deposition method) including vacuum plating and spraying, IVD (ion vapor deposition method), flame spraying, firing, etc.
  • CVD chemical vapor deposition method
  • PVD physical vapor deposition method
  • IVD ion vapor deposition method
  • flame spraying firing, etc.
  • a ceramic coating layer 8 was formed by composite plating, or by uniformly dispersing the ceramic Grain, using the ceramic grain 7 as a eutectic substance and a nickel alloy containing nickel and phosphorus as a matrix
  • the ceramic coating layer described above can be applied to the entire surface of a ring, but it is also sufficient to apply it only to the surface area which is in contact with a rotor, which surface area is subjected to a masking treatment before the coating.
  • Ceramic materials that can be used according to the invention alone or in combination with others are A1203, Zr0 2 , Si0 2 , Ti02, In 2 0 3 , ZaO, Cr 2 0 3 , SiO, TiO, MgO, BeO, Th0 2 , etc. as oxide groups, SiC, TiC, TaC, ZrC, WC, HfC, B 4 C, NbC, C (diamond) etc. as carbide group, Si3N4, TiN, TiC, N. TaN, ZrN, AIN, GaN, BN , InN etc. as a nitride group and TiB 2 , ZrB 2 , HfB 2 , etc. as a boride group.
  • Fig. 1 shows a cross section through the main part of a ring for a spinning machine, according to the first embodiment of the present invention.
  • a flange area 1 of the ring was created Formed into the desired shape by a casting process using silicon carbide with an average through-water of the crystal grain of less than 1 / um. It was subjected to a fire treatment at about 1800 ° C and also a surface treatment by cylindrical grinding to obtain a hardness of 2000 Hv, a crystal grain diameter after the grain growth of 10 / ⁇ m or less and a surface roughness of less than 0.5 to 1, 0 / um.
  • the neck region 2 and the shaft region 4 with the ring rail fitting region 3 were produced mechanically, using carbon steel as the material.
  • the flange portion 1 and the other portions have been joined together by soldering, or by means of an adhesive such as an epoxy resin, cyanoacrylate, etc., to manufacture the ring for a spinning machine according to the invention.
  • the ring thus obtained was examined for wear by a wear testing machine under the following conditions.
  • the ring A according to the invention shows a much smaller increase in the amount of wear over time than the conventional ring B.
  • the flange area made of silicon carbide (SiC) has high strength, high heat resistance and large Has abrasion resistance.
  • the silicon carbide flange portion has almost the same thermal conductivity as the metallic rotor, the heat generated by the sliding of the rotor can easily radiate, which contributes to a reduction in burning and wear of the rotor, and accordingly the lifespan of the runner is extended.
  • FIG 3 shows a cross section through a ring according to the second embodiment of the invention. It is a ring with a flange of the horizontal type made of carbon steel or a steel alloy, produced by a cutting process.
  • ring C has a hardness of 2500 to 3400 Hv, which is much higher than that of the conventional ring B which has been carburized and hardened, as shown in Fig. 4, which shows the cross-sectional hardness distribution curves.
  • Fig. 5 shows the running time and the amount of wear during spinning under the following test conditions using the ring C according to the invention.
  • the ring C according to the invention shows only about 1/5 of the amount of wear, while the life is more than 5 times.
  • the conventional ring B experiences an increase in thread tension due to the increase in friction between the ring and the rotor, causing breakage of the thread, "flying" of the rotor and other troubles while it becomes difficult to run continuously.
  • the ring according to the invention shows a reduction in the coefficient of friction, while no running-in is required and high speed running can be carried out right from the start.
  • FIG. 6 shows a cross section through the ring according to embodiment 3 of the invention.
  • the flange 12 ring 12 shown in Fig. 6 was manufactured by a low carbon steel cutting process.
  • the above ring was subjected to carburizing treatment and surface grinding, it was subjected to a chemical vapor deposition process at a temperature of 850 to 1050 ° C in a gas atmosphere with TiCl 4 , H 2 , CH 4 , N 2 as a main component to form a ceramic coating layer 13A of 2 to 20 / ⁇ m thick, containing titanium carbide (TiC) and a ceramic coating layer 13B of 1 / ⁇ m thick, containing titanium nitride (TiN) on the surface which comes into contact with the rotor.
  • TiC titanium carbide
  • TiN titanium nitride
  • the above-described ceramic coating layer with TiC and TiN can be applied to the entire surface of a ring, but it is sufficient to cover only the surface that comes into contact with a rotor, in which case the surface is treated with a mask before coating becomes.
  • the ring D which is obtained in the manner described above, has, at the outermost surface has a hardness from 1900 to 2500 Hv, and a hardness of 3300-3600 Hv in a depth of 1 / um, as is shown in Fig. 7.
  • Fig. 8 is a graph of graphs of the decrease in the amount of wear over time for performing the spinning process under the following test conditions using the ring D according to the invention.
  • Fig. 9 shows a cross section of a ring according to embodiment 4 according to the invention.
  • This ring was made of carbon steel, for example S15CK material, and formed into a simple flange 16 by means of a cutting process. It was subjected to carburization, quenching and surface treatment. A plated nickel layer 17 About 1 / ⁇ m thick was applied to the surface of the ring by an electron-nickel process, as shown in FIG. 10.
  • a ring with the above-described plated nickel layer 17 was immersed in a plating bath having the following composition ratio, the bath temperature being set at 90 ° C. and a pH of 4.5.
  • the non-electrolytic plating process was carried out by adding 2 g / l of silicon carbide as 0.4 / ⁇ m hard fine grain, while stirring the bath and rotating or swiveling the ring.
  • FIG. 12 is a modification of the ring according to FIG. 1, a concave region 9 (FIG. 12A) being formed on the underside of the flange region 1, the flange region and the neck region being connected to one another to form the ring.
  • a concave region 9 FIG. 12A
  • connection and the adhesion of the two parts to each other is stronger.
  • Fig. 13 shows a modification of the ring after the training f ü form guide 2.
  • This is a sintered ring 11 of the vertical type having a ceramic surface layer 6 on the upper surface of the inner shaft surface and the bottom.
  • Fig. 14 shows a modification of the ring according to Embodiment 3. It is a sintered ring 14 of the conical type with a ceramic surface layer 13A containing titanium carbide and another ceramic coating layer 13B containing titanium nitride on the upper surface, the inner one Contains shaft surface and the bottom.
  • the sintered rings described above have a significantly improved abrasion resistance because they carry a single layer of several layers of the ceramic coating on the pore surface of the surface layer area.
  • the spinning belt is drawn off from a drafting system, passes through a thread guide and is fed to the ring spinning machine, a twist being transferred to the belt by the rotor which is held on the ring according to the invention, the thread being placed around the bobbin.
  • the conventional ring made of carbon steel or a steel alloy has an increased frictional resistance, as well as an abnormally high spinning tension, which leads to yarn breakage or "flying" of the rotor, which makes it impossible will spin the thread.
  • the surface of the flange is designed so that the grain diameter after the grain growth of the ceramic material is less than 10 / ⁇ m and the surface roughness is below 5 / ⁇ m, preferably below 1 / ⁇ m, the ring according to the invention does not require any shrinkage at the beginning , while allowing a high running speed and allowing continuous operation to be carried out stably, even at a speed of more than 25000 rpm.
  • the ring has increased heat resistance and high heat radiation ability while being free from burning of the rotor.
  • the ring according to the invention has a high surface hardness, as well as a smooth surface, it can be safely used for high-speed ring spinning machines, twisting machines and the like, and the highest productivity can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

Anneau pour machines à filer, telles qu'un métier à filer et une machine de tordage de fils. L'anneau se compose d'une partie de rebord, d'une partie de col et d'une partie de fût possédant une partie de montage de rail d'anneau. Au moins la partie de l'anneau en contact coulissant avec un curseur à filer est composée d'un matériau céramique, ou sa surface externe est recouverte d'une couche de revêtement céramique. On obtient ainsi un anneau pour machines à filer, la surface externe duquel, tout en étant aussi lisse que la surface d'un miroir, présente une grande résistance mécanique, ainsi qu'une résistance améliorée à l'usure, à la chaleur et à la corrosion. Cet anneau permet de faire fonctionner la machine à filer à une vitesse élevée égale à 20000 tours/minute au moins.
EP85904861A 1984-09-27 1985-09-26 Anneau pour machines a filer Expired - Lifetime EP0201602B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1984146976U JPH0248438Y2 (fr) 1984-09-27 1984-09-27
JP146976/84U 1984-09-27

Publications (3)

Publication Number Publication Date
EP0201602A1 true EP0201602A1 (fr) 1986-11-20
EP0201602A4 EP0201602A4 (fr) 1987-01-20
EP0201602B1 EP0201602B1 (fr) 1990-05-09

Family

ID=15419813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85904861A Expired - Lifetime EP0201602B1 (fr) 1984-09-27 1985-09-26 Anneau pour machines a filer

Country Status (6)

Country Link
US (1) US4698958A (fr)
EP (1) EP0201602B1 (fr)
JP (1) JPH0248438Y2 (fr)
KR (1) KR880700113A (fr)
DE (1) DE3577583D1 (fr)
WO (1) WO1986002113A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839920A1 (de) * 1987-11-27 1989-06-08 Kanai Juyo Kogyo Kk Ring fuer spinnmaschinen
DE4219197A1 (de) * 1992-06-12 1993-12-16 Zinser Textilmaschinen Gmbh Ringe und Läufer von Spinn- und Zwirnmaschinen
EP0657566A1 (fr) * 1993-12-10 1995-06-14 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Système d'anneau-/curseur pour des métiers à filer et à retordre
EP0843034A3 (fr) * 1996-11-14 1999-02-17 Howa Machinery, Ltd. Structure d'un anneau tournant de filage
CH719102A1 (de) * 2021-11-01 2023-05-15 Braecker Ag Spinn- oder Zwirnring sowie zugehöriger Ringläufer.

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0811848B2 (ja) * 1987-12-28 1996-02-07 金井 宏之 紡機用リング
JPH01321925A (ja) * 1988-06-23 1989-12-27 Kanai Jiyuuyou Kogyo Kk 紡機用リング
US5175988A (en) * 1988-06-23 1993-01-05 Kanai Juyo Kogyo Company Ltd. Ring for spinning machinery
US5160318A (en) * 1989-02-23 1992-11-03 Linvatec Corporation Surgical cutting instrument with ceramic coating on an inner tubular member
US5086615A (en) * 1990-02-15 1992-02-11 A. B. Carter, Inc. Coated spinning rings and travelers
US5313773A (en) * 1992-06-24 1994-05-24 A. B. Carter, Inc. Coatings for spinning applications and rings and travelers coated therewith
US5721055A (en) * 1995-01-03 1998-02-24 Surface Technology, Inc. Lubricated textile spinning machinery parts
US5829240A (en) * 1997-03-17 1998-11-03 A. B. Carter, Inc. Spinning ring having improved traveler bearing surface
US6360520B2 (en) 2000-01-14 2002-03-26 Ab Carter, Inc. Spinning ring having amorphous chromium bearing surface
US20090011136A1 (en) * 2005-05-06 2009-01-08 Thomas Steven Lancsek Composite electroless plating
US20060251910A1 (en) * 2005-05-06 2006-11-09 Lancsek Thomas S Composite electroless plating
US20070184271A1 (en) * 2006-02-08 2007-08-09 Feldstein Michael D Coated textile machinery parts

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US273090A (en) * 1883-02-27 Spinning-ring
US1595858A (en) * 1921-11-19 1926-08-10 Crompton Randolph Traveler ring and traveler for spinning or twister frames
US1957041A (en) * 1933-09-06 1934-05-01 U S Ring Traveler Company Ring holder and ring for travelers
US2194930A (en) * 1938-11-26 1940-03-26 Edward F Feen Glass spinning ring
US2798357A (en) * 1951-09-29 1957-07-09 Rieter Joh Jacob & Cie Ag Spinning ring
BE633325A (fr) * 1962-06-08
US3421307A (en) * 1964-12-24 1969-01-14 Dana Corp Bearing member having a composite coating

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839920A1 (de) * 1987-11-27 1989-06-08 Kanai Juyo Kogyo Kk Ring fuer spinnmaschinen
DE4219197A1 (de) * 1992-06-12 1993-12-16 Zinser Textilmaschinen Gmbh Ringe und Läufer von Spinn- und Zwirnmaschinen
EP0657566A1 (fr) * 1993-12-10 1995-06-14 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Système d'anneau-/curseur pour des métiers à filer et à retordre
US5584168A (en) * 1993-12-10 1996-12-17 Cerasiv Gmbh, Innovatives Keramik-Engineering Ring and traveller system for spinning and twisting frames
RU2130518C1 (ru) * 1993-12-10 1999-05-20 Церазив ГмбХ Инновативес Керамик-Инджиниринг Система кольцо-бегунок к прядильным и крутильным машинам и способ обработки поверхности кольца в системе кольцо-бегунок к прядильным и крутильным машинам
EP0843034A3 (fr) * 1996-11-14 1999-02-17 Howa Machinery, Ltd. Structure d'un anneau tournant de filage
US5970698A (en) * 1996-11-14 1999-10-26 Howa Machinery, Ltd. Rotary spinning ring structure
CN1106466C (zh) * 1996-11-14 2003-04-23 日邦产业株式会社 旋转纺纱钢领结构
CH719102A1 (de) * 2021-11-01 2023-05-15 Braecker Ag Spinn- oder Zwirnring sowie zugehöriger Ringläufer.

Also Published As

Publication number Publication date
JPH0248438Y2 (fr) 1990-12-19
EP0201602A4 (fr) 1987-01-20
WO1986002113A1 (fr) 1986-04-10
US4698958A (en) 1987-10-13
KR880700113A (ko) 1988-02-15
DE3577583D1 (de) 1990-06-13
JPS6164169U (fr) 1986-05-01
EP0201602B1 (fr) 1990-05-09

Similar Documents

Publication Publication Date Title
EP0201602B1 (fr) Anneau pour machines a filer
DE3503859C2 (de) Verbundbeschichtete Gleitfläche eines verschiebbaren Bauteils
DE3545484A1 (de) Laeufer fuer eine spinnmaschine
DE69819995T2 (de) Kolbenring
EP2668309B1 (fr) Élément coulissant, notamment segment de piston avec un revêtement et procédé de fabrication d'un élément coulissant
DE3545826A1 (de) Kolbenring
DE1303710B (de) Verfahren zum Herstellen von Fadenführern
CH697753A2 (de) Beschichteter Ringläufer mit Nanopartikeln.
DE3810775C2 (de) Spinnrotor
DE4491289C2 (de) Strick- oder Wirkwerkzeug
EP0657566B1 (fr) Système d'anneau-/curseur pour des métiers à filer et à retordre
CH697754A2 (de) Beschichteter Spinnring mit Nanopartikeln.
EP1598456A1 (fr) Curseur et son procédé de production
DE69815862T2 (de) Spinnring mit lageroberfläche für läuter
DE3836670A1 (de) Ring fuer spinnmaschinen
EP1192303B1 (fr) Curseur et son procede de production
EP1612307B1 (fr) Dispositif défibreur pour métiers à filer
EP1096043A1 (fr) Procédé de realisation d'un fil de garniture pour la filature à bout ouvert
DE68928458T2 (de) Ring für Spinnmaschinen
DE10249905A1 (de) Garniturring für eine Auflösewalze einer Offenend-Spinnvorrichtung
DE60307041T2 (de) Verfahren zum Aufbringen einer dichten Verschleisschutzschicht und Dichtungsystem
EP0861922A1 (fr) Anneau de filage et curseur pour un métier à filer à anneaux
CH668989A5 (de) Verfahren zur herstellung eines laeufers fuer eine ringspinnmaschine oder ringzwirnmaschine.
DE3839920A1 (de) Ring fuer spinnmaschinen
DE69218588T2 (de) Lager

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

Kind code of ref document: A1

Designated state(s): DE IT

17P Request for examination filed

Effective date: 19861006

A4 Supplementary search report drawn up and despatched

Effective date: 19870120

17Q First examination report despatched

Effective date: 19880412

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

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE IT

REF Corresponds to:

Ref document number: 3577583

Country of ref document: DE

Date of ref document: 19900613

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: FELDMUEHLE AKTIENGESELLSCHAFT, DUESSELDORF

Effective date: 19901012

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: MASCHINENFABRIK RIETER AG

Effective date: 19910207

Opponent name: FELDMUEHLE AKTIENGESELLSCHAFT, DUESSELDORF

Effective date: 19901012

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

Ref country code: DE

Payment date: 19910906

Year of fee payment: 7

ITTA It: last paid annual fee
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

27W Patent revoked

Effective date: 19921004

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO