EP0286931A1 - Compresseur à ondes de pression - Google Patents

Compresseur à ondes de pression Download PDF

Info

Publication number
EP0286931A1
EP0286931A1 EP88105337A EP88105337A EP0286931A1 EP 0286931 A1 EP0286931 A1 EP 0286931A1 EP 88105337 A EP88105337 A EP 88105337A EP 88105337 A EP88105337 A EP 88105337A EP 0286931 A1 EP0286931 A1 EP 0286931A1
Authority
EP
European Patent Office
Prior art keywords
rotor
shaft
electric motor
pressure wave
air
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.)
Withdrawn
Application number
EP88105337A
Other languages
German (de)
English (en)
Inventor
Andreas Mayer
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0286931A1 publication Critical patent/EP0286931A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F13/00—Pressure exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/32—Engines with pumps other than of reciprocating-piston type
    • F02B33/42—Engines with pumps other than of reciprocating-piston type with driven apparatus for immediate conversion of combustion gas pressure into pressure of fresh charge, e.g. with cell-type pressure exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a free-running pressure wave supercharger for an internal combustion engine, with a rotor housing, one end of which is closed by a gas housing with an exhaust gas inlet channel for the supply of high pressure gas to a cell rotor and with an exhaust channel for the discharge of low pressure gas from the cell rotor and the other end side is completed by an air housing with an air intake duct for the supply of low-pressure air into said cell rotor and with a charge air duct for the supply of the charge air compressed in the cell rotor into the internal combustion engine, the air housing having a bearing device for the rotor shaft of the cell rotor.
  • Such additional devices are automatically acting actuating devices for the charge air flap in the charge air line together with a sniffer valve, through which the engine, which works as a naturally aspirated engine in this cold start phase, draws the combustion air directly from the ambient air.
  • a sniffer valve through which the engine, which works as a naturally aspirated engine in this cold start phase, draws the combustion air directly from the ambient air.
  • this snifting valve is opened by the engine in time with the changing intake pressures or is forcibly kept open by a member dependent on the charge air flap and possibly kept locked in the closed position when the charge air flap is open, that is to say in charger operation.
  • the charge air flap is preferably actuated by pneumatic servo devices, e.g. Membrane cans which are acted upon by pressure differences of physical quantities relevant for the pressure wave process and which open the charge air flap when the intensity required for correct operation is reached and keep them open for the duration of the charger operation.
  • jump start devices such as the aforementioned charge air flap automatic, for positively driven pressure wave loaders and the problems associated with the operation of an internal combustion engine charged by pressure wave loaders in the starting phase, especially when the engine is cold, can be found in EP patent specifications 0 028 745, 014 269 and 0 020 791, US Pat. Nos. 4,154, 060 and 4, 368,708 and in DE-PS 26 31 257 of the applicant.
  • a free-running pressure wave charger driven by the gas forces of the internal combustion engine is known, for example, from the applicant's European Patent Application No. 87101608.5.
  • the cell rotor In the case of free-running pressure wave loaders, the cell rotor is driven partly by the nozzle-like design of main and auxiliary channels in the gas and air housing and partly by inclined or curved parts of the cell walls in the entry area of the rotor cells.
  • Tests have shown that the behavior of free-running pressure wave loaders when the engine is warm in stationary operation and also during load changes satisfies all the requirements required for road vehicles. In these operating conditions, they show the same advantages compared to exhaust gas turbochargers as pressure wave superchargers that are inevitably driven by the engine, among other things. namely the practically instantaneous response to an increased fuel supply when the load increases.
  • the present invention arose from the object of avoiding the above-described disadvantageous behavior of a free-running pressure wave charger for charging internal combustion engines in the cold start phase.
  • the rotor must therefore be accelerated from a standstill to a high speed, for example in the range from 4800 to 6000 rpm. It has been experimentally proven that even at much lower rotor speeds, e.g. From around 3000 rpm, a cold engine without a start valve or automatic charge air flap can be started without any problems. When starting the vehicle, however, white smoke briefly occurs at this low rotor speed. However, operation is flawless from the higher speed range mentioned, in which the recirculation of exhaust gas into the engine is reduced to acceptably low values.
  • an electric motor that brings the rotor into the mentioned speed range, that is to about 5000 rpm, in 1 to 1.5 seconds before the engine starts.
  • the preheating time is definitely sufficient to accelerate the rotor up to this speed range before starting.
  • the experiments mentioned were carried out with a ceramic rotor.
  • a stronger electric motor than that used in the experiments mentioned is required.
  • a number of suitable, permanently excited DC motors are available on the market for connection to standard vehicle batteries.
  • the free-running pressure wave charger according to the invention is characterized in that an electric motor is attached to the air housing and that a coupling is present between the shaft of the electric motor and the free end of the rotor shaft, which, when the electric motor is switched on and the drive energy of the gas flow is insufficient, provides a drive connection between the shaft of the electric motor and the rotor shaft.
  • FIG. 1 shows schematically the structure of the pressure wave charger.
  • a rotor housing 1 surrounds a conventional cell rotor 2, consisting of a number of rotor cells 3 distributed uniformly over the circumference, which are delimited on the outside by a shroud 4 and on the inside by a hub tube 5.
  • An air housing 6 is flanged to the rotor housing 1 on the left-hand side, and a gas housing 7 is flanged to the right.
  • the rotor 2 is rigidly connected to a rotor shaft 8, which is mounted in the air housing 6 and can be brought into and out of a drive connection via a coupling 9 with an electric motor 10.
  • the ambient air to be compressed is sucked into the rotor cells 3 via an air intake duct 11 and low-pressure air ducts 11 ⁇ in the air housing 6 and, after compression therein, is supplied to an internal combustion engine, not shown, via high-pressure air ducts and a charge air duct 12.
  • the exhaust gases coming from the engine enter the rotor cells 3 through an exhaust gas inlet duct 13 and high pressure gas ducts (not shown) in the gas housing 7 and leave them through low pressure gas ducts 14 ⁇ and an exhaust duct 14.
  • connection of the cell rotor 2 to the shaft 8 and its mounting in the air housing 6 is the same up to the corresponding coupling 9a, 9b according to FIG. 2 or FIG. 3 between the shaft 8 and the electric motor 10a or 10b.
  • the rotor 2 is seated with a hub sleeve 15, which is connected to the hub tube 5 by ribs 16, on a cylindrical pin 8 ⁇ of the shaft 8, a screw 17 frictionally bracing the shaft 8 against the hub sleeve 15 via a disk 18.
  • the rest of the shaft 8, that is, the journal 8 ⁇ , is in two ball bearings 19, 20 mounted within a bearing sleeve 21 which is firmly clamped in the air housing 6 at the end of the air housing 6 facing the rotor 2.
  • the bearing bush 21 has a collar 22, which is supported via a spacer ring 23 against the flat, rotor 2 facing end face of the air housing 6, in which the control edges of the low-pressure air channels 11 ', not shown, for the supply of ambient air into the rotor cells and not High pressure air channels shown for the discharge of the compressed charge air from the cells 3 to the engine.
  • the part of the bearing bush 21 located in the shaft space 24 of the air housing is provided with an external thread 25 for a ring nut 26 which rigidly clamps the bearing bush 21 in the air housing 6.
  • a commercially available freewheel overrunning clutch of any known type in the embodiment shown one with cylindrical bearing needles or rollers as clamping bodies 27, which run directly without an inner ring on the stub shaft 28 of the electric motor and with a driving electric motor are taken along by this stub shaft in the circumferential direction and thereby jam in a clamping gap formed by the stub shaft and by obliquely to the circumferential direction of the outer ring 29 clamping gap. Since the outer ring 29 sits with a press fit in the bore 30 of the shaft 8, it takes the shaft 8 and thus also the cell rotor 2 with the speed of the electric motor 10a.
  • the outer ring 29 leads ahead of the shaft of the electric motor, as a result of which the clamping bodies 27 are released from the clamping gaps and, as a result, the rotor is freewheeling only from exhaust gases from the internal combustion engine alone is driven.
  • the freewheel overrunning clutch 9a described above requires very little installation space due to the lack of an inner ring and therefore allows a compact, space-saving construction of the air housing and thus of the entire pressure wave charger.
  • other types of freewheel overrunning clutches are suitable for this purpose, for example those with inner rings and on these instead of the outer ring provided clamping surfaces, those with tilting bodies as clamping bodies and possibly adapted to this purpose locking mechanism u. the like
  • the clutch is a cone friction clutch, the hollow cone surface in the rotor shaft 8 and the outer cone surface on the stub shaft 31 of a sliding armature motor 10b of a known type being provided.
  • the clutch friction linings 34 and 35 of the concave clutch half 32 and the convex clutch half 33 are disengaged below the shaft axis and shown above the shaft axis in the engaged state.
  • the conical friction clutch 9b has the advantage that, when the engine is switched off, there is no relative movement between the clutch parts and therefore only a slight abrasion could occur in the long run.
  • the service life of the clutch should therefore reach or even exceed that of an internal combustion engine. Should this not be the case with a high number of starts, re-fitting the coupling parts would not be a problem because of the easily removable electric motor.
  • adjusting elements, for example on one or both coupling parts axially screwable intermediate links are provided to compensate for excessive clutch wear.
  • the rolling bearings of the electric motor could be damaged by the shocks caused by the internal combustion engine and bumps in the road. These stresses can cause plastic deformations on the roller bearing elements. It could therefore be expedient to let the electric motor lag behind the rotor of the pressure wave charger at a more or less high speed during the entire operating time of the internal combustion engine. This gives the more favorable stress conditions of a rotating bearing.
  • the electric motor is then expediently operated at a speed from which it can quickly accelerate the supercharger rotor at idle to a speed at which the internal combustion engine cannot die due to excessive recirculation. It can then also be used to support the turning of the loader rotor when the load increases rapidly.
  • means for quickly braking its armature can be provided on the electric motor.
  • a polarity reversal of the armature current or brake magnets can be provided on the electric motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Supercharger (AREA)
EP88105337A 1987-04-16 1988-04-02 Compresseur à ondes de pression Withdrawn EP0286931A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1504/87 1987-04-16
CH150487 1987-04-16

Publications (1)

Publication Number Publication Date
EP0286931A1 true EP0286931A1 (fr) 1988-10-19

Family

ID=4211992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105337A Withdrawn EP0286931A1 (fr) 1987-04-16 1988-04-02 Compresseur à ondes de pression

Country Status (3)

Country Link
US (1) US4838234A (fr)
EP (1) EP0286931A1 (fr)
JP (1) JPS63277817A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT408785B (de) * 1995-11-30 2002-03-25 Blank Otto Ing Aufladeeinrichtung für die ladeluft einer verbrennungskraftmaschine
DE102010011147A1 (de) * 2010-03-11 2011-09-15 Benteler Automobiltechnik Gmbh Druckwellenlader
DE102011013520A1 (de) * 2011-03-10 2012-09-13 Benteler Automobiltechnik Gmbh Magnetkupplung für Druckwellenladeranordnung sowie Verfahren zum Betreiben einer derartigen Druckwellenladeranordnung
DE102011053218A1 (de) * 2011-09-02 2013-03-07 Benteler Automobiltechnik Gmbh Druckwellenladeranordnung mit elektromagnetischer Schlupfkupplung

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5048470A (en) * 1990-12-24 1991-09-17 Ford Motor Company Electronically tuned intake manifold
DE10050161A1 (de) * 2000-10-11 2002-04-18 Daimler Chrysler Ag Abgasturbolader für eine Brennkraftmaschine und Verfahren zum Betrieb eines Abgasturboladers
US20030084888A1 (en) 2001-11-08 2003-05-08 Lebold Robert S Supercharger type compressor/generator with magnetically loaded composite rotor
US7849840B2 (en) * 2005-02-14 2010-12-14 St James David Electric motor assisted mechanical supercharging system
SE529124C2 (sv) * 2005-04-05 2007-05-08 Atlas Copco Tools Ab Pneumatiskt verktyg med utloppsljuddämpare
DE102006020522A1 (de) 2006-05-03 2007-11-08 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
US7699737B2 (en) * 2008-02-05 2010-04-20 Ford Global Technologies, Llc Electric axle drive unit
US9920774B2 (en) * 2015-08-21 2018-03-20 Energy Recovery, Inc. Pressure exchange system with motor system and pressure compensation system

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399394A (en) * 1940-12-07 1946-04-30 Bbc Brown Boveri & Cie Pressure exchanger
DE1045526B (de) * 1957-09-20 1958-12-04 Demag Zug Gmbh Elektromotorischer Antrieb fuer zwei Drehzahlen, insbesondere fuer Haushaltwaschautomaten
DE1092551B (de) * 1959-12-18 1960-11-10 Demag Zug Gmbh Fuer eine aus zwei Elektromotoren bestehende Antriebsmaschine bestimmter Verschiebelaeufermotor
US3822768A (en) * 1971-10-20 1974-07-09 Demag Ag Cone friction brake
FR2488330A1 (fr) * 1980-08-11 1982-02-12 Chauvierre Marc Procede de suralimentation des moteurs a explosion a bas regime
GB2086987A (en) * 1980-11-08 1982-05-19 Pierburg Gmbh & Co Kg Supplying air or combustible gas to an ic engine
EP0105686A2 (fr) * 1982-09-30 1984-04-18 AlliedSignal Inc. Compresseur de suralimentation
US4527534A (en) * 1981-09-07 1985-07-09 Mazda Motor Corporation Fuel intake control system for supercharged engine
EP0151407A1 (fr) * 1984-01-18 1985-08-14 Mazda Motor Corporation Dispositif de contrôle d'un surpresseur pour moteur à explosion suralimenté
DE3505613A1 (de) * 1984-02-24 1985-08-29 Sommer Co., Warren, Mich. Motorkupplungseinrichtung
AU553633B2 (en) * 1982-06-02 1986-07-24 Efco Manufacturing Company Pty. Ltd., The Door control apparatus

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE638367C (de) * 1930-11-28 1936-11-13 Adolf Schnuerle Dr Ing Zweitaktbrennkraftmaschine mit einem zum Spuelen und Laden dienenden Abgasgeblaese
CH181043A (de) * 1934-09-26 1935-11-30 Vogler Hans Zweitaktbrennkraftmaschine mit Rotationsgebläse.
US2654991A (en) * 1950-09-09 1953-10-13 Nettel Frederick Control for engine turbosupercharger systems
GB1250764A (fr) * 1968-03-19 1971-10-20
CH593422A5 (fr) * 1975-12-31 1977-11-30 Bbc Brown Boveri & Cie
DE2631257C3 (de) * 1976-07-12 1980-06-12 Bbc Ag Brown, Boveri & Cie, Baden (Schweiz) Stellgerät für eine in der Ladeluftleitung eines Dieselmotors angeordnete Luftklappe
DE2901082A1 (de) * 1979-01-11 1980-07-17 Bbc Brown Boveri & Cie Stellgeraet fuer eine in der ladeluftleitung eines dieselmotors angeordnete luftklappe
CH638870A5 (de) * 1979-02-01 1983-10-14 Bbc Brown Boveri & Cie Startventilvorrichtung, insbesondere fuer dieselmotoren mit druckwellenlader.
EP0020791B1 (fr) * 1979-06-08 1985-09-25 Knorr-Bremse Ag Dispositif de commande d'une valve disposée dans la conduite d'air de charge d'un moteur à combustion
DE2945230A1 (de) * 1979-11-09 1981-05-21 BBC AG Brown, Boveri & Cie., Baden, Aargau Stellgeraet fuer eine in der ladeluftleitung eines verbrennungsmotors angeordnete luftklappe

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399394A (en) * 1940-12-07 1946-04-30 Bbc Brown Boveri & Cie Pressure exchanger
DE1045526B (de) * 1957-09-20 1958-12-04 Demag Zug Gmbh Elektromotorischer Antrieb fuer zwei Drehzahlen, insbesondere fuer Haushaltwaschautomaten
DE1092551B (de) * 1959-12-18 1960-11-10 Demag Zug Gmbh Fuer eine aus zwei Elektromotoren bestehende Antriebsmaschine bestimmter Verschiebelaeufermotor
US3822768A (en) * 1971-10-20 1974-07-09 Demag Ag Cone friction brake
FR2488330A1 (fr) * 1980-08-11 1982-02-12 Chauvierre Marc Procede de suralimentation des moteurs a explosion a bas regime
GB2086987A (en) * 1980-11-08 1982-05-19 Pierburg Gmbh & Co Kg Supplying air or combustible gas to an ic engine
US4527534A (en) * 1981-09-07 1985-07-09 Mazda Motor Corporation Fuel intake control system for supercharged engine
AU553633B2 (en) * 1982-06-02 1986-07-24 Efco Manufacturing Company Pty. Ltd., The Door control apparatus
EP0105686A2 (fr) * 1982-09-30 1984-04-18 AlliedSignal Inc. Compresseur de suralimentation
EP0151407A1 (fr) * 1984-01-18 1985-08-14 Mazda Motor Corporation Dispositif de contrôle d'un surpresseur pour moteur à explosion suralimenté
DE3505613A1 (de) * 1984-02-24 1985-08-29 Sommer Co., Warren, Mich. Motorkupplungseinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 326 (M-441)[2049], 21. Dezember 1985; & JP-A-60 159 340 (MAZDA K.K.) 20-08-1985 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT408785B (de) * 1995-11-30 2002-03-25 Blank Otto Ing Aufladeeinrichtung für die ladeluft einer verbrennungskraftmaschine
DE102010011147A1 (de) * 2010-03-11 2011-09-15 Benteler Automobiltechnik Gmbh Druckwellenlader
FR2957390A1 (fr) * 2010-03-11 2011-09-16 Benteler Automobiltechnik Gmbh Compresseur de suralimentation a ondes de pression, pour moteurs a combustion interne de vehicules automobiles
DE102010011147A8 (de) * 2010-03-11 2011-12-15 Benteler Automobiltechnik Gmbh Druckwellenlader
DE102010011147B4 (de) * 2010-03-11 2013-04-25 Benteler Automobiltechnik Gmbh Druckwellenlader
DE102011013520A1 (de) * 2011-03-10 2012-09-13 Benteler Automobiltechnik Gmbh Magnetkupplung für Druckwellenladeranordnung sowie Verfahren zum Betreiben einer derartigen Druckwellenladeranordnung
DE102011053218A1 (de) * 2011-09-02 2013-03-07 Benteler Automobiltechnik Gmbh Druckwellenladeranordnung mit elektromagnetischer Schlupfkupplung
DE102011053218B4 (de) * 2011-09-02 2015-06-25 Benteler Automobiltechnik Gmbh Druckwellenladeranordnung mit elektromagnetischer Schlupfkupplung

Also Published As

Publication number Publication date
US4838234A (en) 1989-06-13
JPS63277817A (ja) 1988-11-15

Similar Documents

Publication Publication Date Title
DE69004653T2 (de) Turbolader mit elektrischer Rotationsmaschine.
EP0286931A1 (fr) Compresseur à ondes de pression
EP1995427B1 (fr) Système de compresseur
EP2600007B1 (fr) Dispositif de système automobile et procédé de fonctionnement d'un dispositif de système automobile
DE69003773T2 (de) Aufladevorrichtung für Brennkraftmaschinen.
EP0634568B1 (fr) Embrayage à friction, notamment pour le ventilateur d'un moteur d'une automobile
WO1989002521A1 (fr) Entrainement mecanique pour surcompresseur de moteur a combustion interne
DE2925675A1 (de) Kraftfahrzeug
DE10050161A1 (de) Abgasturbolader für eine Brennkraftmaschine und Verfahren zum Betrieb eines Abgasturboladers
DE2604472A1 (de) Verfahren und anlage zur verminderung des kraftstoffverbrauchs eines von einem verbrennungsmotor angetriebenen kraftfahrzeugs
DE102010013702A1 (de) Turbine, Abgasturbolader, Kraftfahrzeug und Verfahren zur Montage einer derartigen Turbine
DE2801764A1 (de) Kraftuebertragungselement fuer elektrische anlasser von verbrennungsmotoren
DE102010021449A1 (de) Verfahren zum Betreiben eines Verbrennungsmotors und Verbrennungsmotor
EP0266636B1 (fr) Compresseur à ondes de pression
EP0713973A1 (fr) Pompe à huile
DE202016007130U1 (de) Russ- und Feinstaubzentrifuge
EP0154205A1 (fr) Turbine à explosions
DE112011102089B4 (de) Pumpenanordnung
EP2205842B1 (fr) Soupape de branchement de compresseur et dispositif de suralimentation à registre doté d'une telle soupape de branchement de compresseur
DE102016119889A1 (de) Axialkolbenmotor sowie Verfahren zum Betrieb eines Axialkolbenmotors
EP1504177A1 (fr) Turbocompresseur a gaz d'echappement, a geometrie variable et a entrainement supplementaire pour un moteur a combustion interne
DE102009048349B3 (de) Kühlmittelpumpe
DE10117517B4 (de) Kupplungsbaugruppe für einen Kompressor zur mechanischen Aufladung einer Brennkraftmaschine
DE1807070C3 (de) Hubkolbenbrennkraftmaschine mit einem Drosselorgan in der Abgasleitung
DE2410683B2 (de) Aufladeeinrichtung fuer einen verbrennungsmotor

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): AT CH DE ES FR GB IT LI

17P Request for examination filed

Effective date: 19890401

17Q First examination report despatched

Effective date: 19891010

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19900804

R18W Application withdrawn (corrected)

Effective date: 19900804