[go: up one dir, main page]

EP0173371B1 - Appareil auditif - Google Patents

Appareil auditif Download PDF

Info

Publication number
EP0173371B1
EP0173371B1 EP85201204A EP85201204A EP0173371B1 EP 0173371 B1 EP0173371 B1 EP 0173371B1 EP 85201204 A EP85201204 A EP 85201204A EP 85201204 A EP85201204 A EP 85201204A EP 0173371 B1 EP0173371 B1 EP 0173371B1
Authority
EP
European Patent Office
Prior art keywords
hearing aid
coupling piece
housing
sealing plug
hearing
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 - Lifetime
Application number
EP85201204A
Other languages
German (de)
English (en)
Other versions
EP0173371A1 (fr
Inventor
Heinz Hardt
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.)
Viennatone GmbH
Original Assignee
Viennatone 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=3536221&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0173371(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Viennatone GmbH filed Critical Viennatone GmbH
Publication of EP0173371A1 publication Critical patent/EP0173371A1/fr
Application granted granted Critical
Publication of EP0173371B1 publication Critical patent/EP0173371B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H04R25/656—Non-customized, universal ear tips, i.e. ear tips which are not specifically adapted to the size or shape of the ear or ear canal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/025—In the ear hearing aids [ITE] hearing aids
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/658—Manufacture of housing parts

Definitions

  • the invention relates to a hearing aid for essentially complete insertion into the external auditory canal (auditory canal device) with a housing on which an outwardly projecting cylindrical coupling element, which carries a sealing plug and has a sound outlet opening on its free end face, is held, amplifier, receiver, Microphone and battery.
  • Such a hearing aid was e.g. known from U.S. Patent No. 3,783,201.
  • the sealing plug is practically machined from a piece of solid material and is provided with a continuous bore serving as a formwork channel, and a front-end recess which widens it and serves to receive the coupling piece.
  • circumferential ribs are attached to the outer surface of the sealing plug.
  • the aim of the invention is to avoid these disadvantages and to propose a hearing aid of the type mentioned at the outset in which, on the one hand, a high degree of wearing comfort is achieved and pressure points in particular are reliably avoided and nevertheless an optimal sealing of the auditory canal is ensured.
  • the sealing plug is formed from a cylindrical inner part seated on the coupling piece and an outer part which is turned back around the inner part in the region of the end remote from the housing, the sealing plug being made of a material with an A-Shore hardness of not is made more than 70 °.
  • the proposed measures also make it very easy to manufacture the sealing plugs, which fit practically every ear. At most, these can be made in different sizes, but they can always be used with the same coupling pieces.
  • the coupling piece is arranged in the central axis of the device or is pivoted from the central axis to form a right or left hearing device, whereby an even better fit and greater wearing comfort of the hearing device can be achieved.
  • a particularly preferred embodiment of a hearing aid according to the invention is characterized in that the shape of the housing corresponds approximately to a circular sector, the boundary lines of which form an angle a of approximately 85 ° to 110 ° to one another.
  • a coupling piece 2 is inserted at the lower end into a thin-walled plastic or metal housing 1 receiving the hearing aid elements.
  • the connection can be made by soldering, riveting, gluing or the like.
  • the coupling piece 2 can also be produced in one piece with the housing.
  • the sound outlet of the receiver 3 installed in the housing 1 is connected to the coupling piece 2 by a hose 4 drawn into it or in another suitable manner.
  • Other internals known per se, such as microphone, amplifier, etc. are not shown for the sake of clarity.
  • the coupling piece 2 can have approximately the conical snap shape shown in FIG. 1 or also be cylindrical, fine grooves causing an increase in friction (FIG. 1a).
  • Another possible embodiment of the coupling piece is shown in Fig.lb in the form of a hollow threaded pin.
  • the housing 1 In order to fit into as many ears as possible, the housing 1 should have a section parallel to its large surface approximately in the shape of a circular sector, the boundaries of which form an angle a with respect to one another, which is advantageously between approximately 85 ° and 110 ° .
  • the housing is covered on its upper side by a closure plate 5, which in turn carries a volume plate 6 and a battery cover 7.
  • a sealing plug 11 according to FIG. 2 is fastened on the coupling piece 2, as shown in FIG is shown.
  • the inner part 8 should be as thick-walled as possible in order to ensure sufficient stability and a good fit on the coupling piece 2.
  • the inner wall 9 must be designed according to the shape of the coupling piece 2 in order to enable a coherent but detachable connection.
  • the outer part 10 of the mushroom-shaped sealing plug 11 should be thin-walled in order to fit tightly against the wall of the ear canal. The necessary different sizes of the sealing plug 11 to adapt to different auditory canals differ essentially only by the outer diameter D.
  • the hearing aid according to the invention is shown in a side view in FIG.
  • the shape of the housing corresponds approximately to a circular sector.
  • the coupling piece 2 will preferably lie in the axis of the hearing aid in order to obtain a symmetrical structure. However, it could also be pivoted slightly to the side (2a). This inevitably leads to a "right” or "left” hearing aid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)

Claims (3)

1. Appareil auditif pour introduction essentiellement en totalité dans le conduit auditif extérieur (appareil pour conduit auditif), ayant une enveloppe sur laquelle est fixée une pièce d'accouplement cylindrique, faisant saillie à l'extérieur, portant un bouchon d'étanchéité et présentant un orifice de sortie sonore sur sa face libre, un amplificateur, un écouteur, un microphone et une pile, caractérisé par le fait que le bouchon d'étanchéité (11) est formé d'une partie intérieure de forme cylindrique (8) posée sur la pièce d'accouplement et d'une partie extérieure (10) retournée autour de la partie intérieure (8) dans la zone de l'extrémité éloignée de l'enveloppe (1), le bouchon d'étanchéité étant fabriqué en un matériau de dureté Shore "A" de 70° au maximum.
2. Appareil auditif selon la revendication 1, caractérisé par le fait que la pièce d'accouplement (2) est disposée sur l'axe médian de l'appareil ou qu'elle est décentrée de l'axe médian pour constituer un appareil auditif droit ou gauche (2a).
3. Appareil auditif selon la revendication 1 ou 2, caractérisé par le fait que la forme de l'enveloppe (1) correspond approximativement à un secteur circulaire dont les lignes de délimitation enferment entre elles un angle alpha d'approximativement 85 à 110°.
EP85201204A 1984-08-06 1985-07-18 Appareil auditif Expired - Lifetime EP0173371B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2547/84 1984-08-06
AT0254784A AT380762B (de) 1984-08-06 1984-08-06 Hoergeraet

Publications (2)

Publication Number Publication Date
EP0173371A1 EP0173371A1 (fr) 1986-03-05
EP0173371B1 true EP0173371B1 (fr) 1990-02-28

Family

ID=3536221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201204A Expired - Lifetime EP0173371B1 (fr) 1984-08-06 1985-07-18 Appareil auditif

Country Status (6)

Country Link
US (1) US4607720A (fr)
EP (1) EP0173371B1 (fr)
JP (1) JPS6157200A (fr)
AT (1) AT380762B (fr)
DE (1) DE3576268D1 (fr)
DK (1) DK355885A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11218819B2 (en) 2018-02-05 2022-01-04 Paul Gregor Junke Universal adapter for hearing aids and earphones

Families Citing this family (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5002151A (en) * 1986-12-05 1991-03-26 Minnesota Mining And Manufacturing Company Ear piece having disposable, compressible polymeric foam sleeve
US4880076A (en) 1986-12-05 1989-11-14 Minnesota Mining And Manufacturing Company Hearing aid ear piece having disposable compressible polymeric foam sleeve
US6671381B1 (en) * 1993-11-23 2003-12-30 Gabriele Lux-Wellenhof Sleeve for hearing aids, and a method and apparatus for testing hearing
US5449865A (en) * 1994-01-28 1995-09-12 Minnesota Mining And Manufacturing Company Ear tips having molded-in recesses for attachment to a stethoscope
EP0959773B1 (fr) * 1996-04-10 2003-12-03 Minnesota Mining And Manufacturing Company Embouts d'oreille presentant une pluralite de surfaces de contact d'oreille
ITFO970022A3 (it) * 1997-09-16 1999-03-16 Otosan Di Gianardi Massimilian Accessorio di sicurezza per i coni di tessuto e cera impiegati nella p ulizia del cavo auricolare
US6022311A (en) * 1997-12-18 2000-02-08 General Hearing Instrument, Inc. Apparatus and method for a custom soft-solid hearing aid
US6254526B1 (en) 1997-12-18 2001-07-03 Softear Technologies, L.L.C. Hearing aid having hard mounting plate and soft body bonded thereto
US6434248B1 (en) 1997-12-18 2002-08-13 Softear Technologies, L.L.C. Soft hearing aid moulding apparatus
US6432247B1 (en) 1997-12-18 2002-08-13 Softear Technologies, L.L.C. Method of manufacturing a soft hearing aid
US6695943B2 (en) 1997-12-18 2004-02-24 Softear Technologies, L.L.C. Method of manufacturing a soft hearing aid
US6228020B1 (en) 1997-12-18 2001-05-08 Softear Technologies, L.L.C. Compliant hearing aid
US6438244B1 (en) 1997-12-18 2002-08-20 Softear Technologies Hearing aid construction with electronic components encapsulated in soft polymeric body
US6473512B1 (en) 1997-12-18 2002-10-29 Softear Technologies, L.L.C. Apparatus and method for a custom soft-solid hearing aid
ATE322139T1 (de) 1997-12-18 2006-04-15 Softear Technologies L L C Vorrichtung und verfahren für passbares weiches festes hörhilfegerät
US6728383B1 (en) 1997-12-18 2004-04-27 Softear Technologies, L.L.C. Method of compensating for hearing loss
US7217335B2 (en) * 1998-05-26 2007-05-15 Softear Technologies, L.L.C. Method of manufacturing a soft hearing aid
US20080063231A1 (en) * 1998-05-26 2008-03-13 Softear Technologies, L.L.C. Method of manufacturing a soft hearing aid
US6940988B1 (en) * 1998-11-25 2005-09-06 Insound Medical, Inc. Semi-permanent canal hearing device
US7664282B2 (en) * 1998-11-25 2010-02-16 Insound Medical, Inc. Sealing retainer for extended wear hearing devices
US6129174A (en) * 1998-12-30 2000-10-10 Decibel Instruments, Inc. Minimal contact replaceable acoustic coupler
GB9907050D0 (en) 1999-03-26 1999-05-19 Sonomax Sft Inc System for fitting a hearing device in the ear
US20070071265A1 (en) * 1999-05-05 2007-03-29 Leedom Marvin A Disposable modular hearing aid
US7113611B2 (en) * 1999-05-05 2006-09-26 Sarnoff Corporation Disposable modular hearing aid
US7403629B1 (en) 1999-05-05 2008-07-22 Sarnoff Corporation Disposable modular hearing aid
EP1254585A4 (fr) * 1999-12-09 2008-10-29 Sonionmicrotronic Nederland Microphone miniature
AU2001245680A1 (en) * 2000-03-13 2001-09-24 Sarnoff Corporation Disposable modular hearing aid
US7136496B2 (en) * 2001-04-18 2006-11-14 Sonion Nederland B.V. Electret assembly for a microphone having a backplate with improved charge stability
US6937735B2 (en) * 2001-04-18 2005-08-30 SonionMicrotronic Néderland B.V. Microphone for a listening device having a reduced humidity coefficient
US7062058B2 (en) * 2001-04-18 2006-06-13 Sonion Nederland B.V. Cylindrical microphone having an electret assembly in the end cover
US7239714B2 (en) 2001-10-09 2007-07-03 Sonion Nederland B.V. Microphone having a flexible printed circuit board for mounting components
US6860362B2 (en) * 2002-03-20 2005-03-01 Siemens Hearing Instruments, Inc. Hearing aid instrument flexible attachment
US8280082B2 (en) * 2002-10-08 2012-10-02 Sonion Nederland B.V. Electret assembly for a microphone having a backplate with improved charge stability
WO2004078064A2 (fr) * 2003-02-28 2004-09-16 Softear Technologies, L.L.C. Prothese auditive souple a fil en acier inoxydable
US8457336B2 (en) * 2004-02-05 2013-06-04 Insound Medical, Inc. Contamination resistant ports for hearing devices
US20070003081A1 (en) * 2005-06-30 2007-01-04 Insound Medical, Inc. Moisture resistant microphone
US20070284182A1 (en) * 2006-06-12 2007-12-13 Chia-Chun Mu Waterproof earplug with sound-transmitting effect
US20080170709A1 (en) * 2007-01-16 2008-07-17 Microsonic, Inc. Sound transmitting device
DE102007037024A1 (de) * 2007-08-06 2009-02-26 Siemens Medical Instruments Pte. Ltd. Hörereinrichtung mit elastisch gelagertem Hörer
WO2009023738A2 (fr) * 2007-08-14 2009-02-19 Insound Medical, Inc. Ensemble microphone et récepteur combiné pour des dispositifs auditifs de canal à port étendu
US7931027B2 (en) * 2007-10-15 2011-04-26 Widex A/S Earplug with engagement means
US8280093B2 (en) 2008-09-05 2012-10-02 Apple Inc. Deformable ear tip for earphone and method therefor
US8348010B2 (en) * 2007-10-19 2013-01-08 Apple Inc. Invertible ear tips for an ear piece
US8538061B2 (en) 2010-07-09 2013-09-17 Shure Acquisition Holdings, Inc. Earphone driver and method of manufacture
US8548186B2 (en) 2010-07-09 2013-10-01 Shure Acquisition Holdings, Inc. Earphone assembly
US8549733B2 (en) 2010-07-09 2013-10-08 Shure Acquisition Holdings, Inc. Method of forming a transducer assembly
US8761423B2 (en) 2011-11-23 2014-06-24 Insound Medical, Inc. Canal hearing devices and batteries for use with same
US8682016B2 (en) 2011-11-23 2014-03-25 Insound Medical, Inc. Canal hearing devices and batteries for use with same
US10129620B2 (en) * 2016-01-25 2018-11-13 Bragi GmbH Multilayer approach to hydrophobic and oleophobic system and method
USD831620S1 (en) * 2017-05-26 2018-10-23 Head-Direct (Kunshan) Company Limited Earphone

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2266788A (en) * 1937-11-19 1941-12-23 John B Nelson Hearing aid device
US3209082A (en) * 1957-05-27 1965-09-28 Beltone Electronics Corp Hearing aid
DE2057611A1 (de) * 1970-11-24 1972-06-08 Wolfgang Dreve Hoergeraet,insbesondere fuer Schwerhoerige
US3783201A (en) * 1970-12-02 1974-01-01 Beltone Electronics Corp Miniature hearing aid structure
US3882848A (en) * 1974-01-24 1975-05-13 American Electromedics Corp Test probe for an impedance audiometer
US4055233A (en) * 1975-12-22 1977-10-25 Electronic Engineering Co. Of California Ear coupler
JPS5330316A (en) * 1976-09-01 1978-03-22 Koken Kk Sealed sound receiver
DE2825233A1 (de) * 1977-06-21 1979-01-04 Georges Ducommun Hoergeraet
US4314553A (en) * 1979-08-08 1982-02-09 Bilsom Ab Earplug and earplug set
IT8030644V0 (it) * 1980-02-13 1980-02-13 Drago Dino Apparecchio o protesi acustica intrauricolare personalizzata e migliorata.
US4375016A (en) * 1980-04-28 1983-02-22 Qualitone Hearing Aids Inc. Vented ear tip for hearing aid and adapter coupler therefore
EP0085032B1 (fr) * 1982-01-27 1989-04-19 COS.EL.GI. S.p.A. Auxiliaires auditif du type à porter dans le conduit auditif extérieur de l'utilisateur
US4471490A (en) * 1983-02-16 1984-09-11 Gaspare Bellafiore Hearing aid
US4532649A (en) * 1983-07-03 1985-07-30 Gaspare Bellafiore Hearing aid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11218819B2 (en) 2018-02-05 2022-01-04 Paul Gregor Junke Universal adapter for hearing aids and earphones

Also Published As

Publication number Publication date
DK355885D0 (da) 1985-08-05
US4607720A (en) 1986-08-26
EP0173371A1 (fr) 1986-03-05
DK355885A (da) 1986-02-07
JPS6157200A (ja) 1986-03-24
ATA254784A (de) 1985-11-15
DE3576268D1 (de) 1990-04-05
AT380762B (de) 1986-07-10

Similar Documents

Publication Publication Date Title
EP0173371B1 (fr) Appareil auditif
DE19829637C2 (de) Medizinisches Implantat
DE68918327T3 (de) Programmierungsschnittstelle für Hörgeräte.
DE4019250C2 (fr)
DE2950331A1 (de) Hinter dem ohr anzubringendes hoerhilfsgeraet
DE102007045315B3 (de) Werkzeug zum Einsetzen eines Hörers einer Hörvorrichtung in einen Gehörgang
DE2912161A1 (de) Hautelektrode
EP0842590A1 (fr) Prothese auditive
DE4327634C1 (de) Hinter dem Ohr zu tragendes Hörhilfegerät
WO1985004779A1 (fr) Piece terminale d'otoplastie d'appareils de correction auditive situee du cote du conduit auditif et otoplastie d'appareils de correction auditive
DE102020119125A1 (de) Hörer und Kopfhörer
DE102010007609A1 (de) Hörerschlauch mit Zugentlastung sowie Hörhilfe
DE3821264C2 (fr)
EP1563712A1 (fr) Ensemble et procede pour produire une prothese auditive et prothese auditive produite selon ledit procede
EP0821542A2 (fr) Prothèse auditive portable complètement dans le conduit auditif et individualisée par moulage d'un corps
DE3516290C2 (fr)
DE3227673A1 (de) Stecker fuer kleinhoerer
DE7934987U1 (de) Im-ohr-hoergeraet fuer schwerhoerige
DE3505099C2 (fr)
DE1287137B (de) Im Ohr zu tragendes Schwerhoerigengeraet
DE60221107T2 (de) Verfahren zur herstellung einer hörhilfenhalterung und eines hilfsteils
EP1443802B1 (fr) Prothèse auditive placée derrière l'oreille
DE102012201216A1 (de) Gehörgangseinsatz zur lösbaren Verbindung mit einem Hörgerät
DE102005009377B3 (de) Im-Ohr-Hörgerät mit abnehmbarem Lautsprecher
DE1960963A1 (de) Hoergeraet fuer Schwerhoerige

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): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19860829

17Q First examination report despatched

Effective date: 19880601

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

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

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3576268

Country of ref document: DE

Date of ref document: 19900405

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

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

Ref country code: GB

Payment date: 19900709

Year of fee payment: 6

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

Ref country code: FR

Payment date: 19900719

Year of fee payment: 6

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

Ref country code: CH

Payment date: 19900730

Year of fee payment: 6

ITTA It: last paid annual fee
26 Opposition filed

Opponent name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN

Effective date: 19900621

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

Ref country code: DE

Payment date: 19900830

Year of fee payment: 6

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: SIEMENS AG GRPA 4 ERL S

Effective date: 19901025

Opponent name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN

Effective date: 19900621

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

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

27W Patent revoked

Effective date: 19910510

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