EP0466978A2 - Procédé et appareil pour revêtir des pistons - Google Patents

Procédé et appareil pour revêtir des pistons Download PDF

Info

Publication number
EP0466978A2
EP0466978A2 EP90124892A EP90124892A EP0466978A2 EP 0466978 A2 EP0466978 A2 EP 0466978A2 EP 90124892 A EP90124892 A EP 90124892A EP 90124892 A EP90124892 A EP 90124892A EP 0466978 A2 EP0466978 A2 EP 0466978A2
Authority
EP
European Patent Office
Prior art keywords
screen printing
coating
pistons
piston
stencil
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Withdrawn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
EP90124892A
Other languages
German (de)
English (en)
Other versions
EP0466978A3 (fr
Inventor
Peter Dipl-Ing. Alt
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.)
Individual
Original Assignee
Individual
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=6410704&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0466978(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of EP0466978A2 publication Critical patent/EP0466978A2/fr
Publication of EP0466978A3 publication Critical patent/EP0466978A3/xx
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a method and a device for coating the cylindrical circumference of engine pistons or the like with coating material, in particular lubricating pastes.
  • Such a coating of piston surfaces which is usually a lead, tin, graphite or similar coating of a certain thickness, is carried out on pistons in order to prevent the pistons from seizing if the oil lubrication fails in the cylinders of an internal combustion engine also to reduce the knocking of the engine when coating in varying thickness and changing coating pattern.
  • the coating of engine pistons has hitherto generally been applied by spraying, which is complex and unsatisfactory due to high losses at low output.
  • spraying has a high environmental impact due to the spraying of large amounts of solvents.
  • the circumferential surfaces of the pistons are coated with masks during spraying, no sharp contours of the coating surfaces can be achieved.
  • the spray mist also causes undefined coating contours underneath the spray masks that do not fit tightly.
  • the thickness of the coating which is determined by adjusting the spray nozzle, usually has large tolerances.
  • the invention is therefore based on the object of providing a method and a device for coating the cylindrical periphery of engine pistons or the like with coating material, by means of which the aforementioned, previously existing shortcomings are eliminated with relatively simple procedural and structural outlay. It should also be achieved that the required coating thickness can be reproduced at any time based on predetermined values for different pistons.
  • This object is achieved in that the coating is carried out by screen printing.
  • a uniform coating with the smallest of tolerances can be applied in a rational manner to the cylindrical peripheral surfaces of engine pistons or the like, with any environmentally harmful emissions, such as e.g. solvent evaporation are completely switched off.
  • This process can also be used to apply several layers of the same or different thicknesses one above the other in one process sequence. If the viscosity of the coating composition remains the same, the thickness of the coating on the piston peripheral surface can be predetermined via the quality of the fabric of the screen printing stencil.
  • one or more uncoated open areas can advantageously also be provided as lubrication pockets and / or as a control window in the form of slots, holes, cutouts, strips or the like in a coated surface.
  • Such open spaces serve a double function.
  • they can serve as measuring holes or control windows for measuring and thus for checking the coating thickness, and on the other hand, they improve the lubrication of the piston in normal operation, since they act as a lubrication bearing.
  • such free areas can be produced in a simple manner and without great effort in any size and design with very precise tolerances with regard to thickness and edge contours. This is especially true for very small open spaces.
  • the pistons are expediently printed and rotated about their vertical central longitudinal axis on a screen printing stencil while resting against it, the screen stencil being moved in the direction of rotation of the piston peripheral surface.
  • the coating is advantageously applied in a wedge shape at its lateral and / or upper and lower edges with decreasing coating thickness. This measure prevents hard edges or steps and the coated surface runs out smoother. In this way, in particular a better adaptation to the roundness of the piston is achieved and correspondingly strong resistances are avoided. This applies in particular to the lateral edges, but it is also advantageous for the upper and lower edges with regard to the direction of movement of the piston.
  • the coating composition can be continuously mixed and fed into the screen printing stencil of the screen printing unit.
  • the invention also relates to a device for carrying out the screen printing coating, which is characterized in that it has one or more screen printing stations, each with a screen printing stencil and an application squeegee, on the screen printing template of which the pistons to be coated can be moved into their receptacles with their cylindrical peripheral surface to be coated that the pistons with their receptacles in the advanced position can be rotated about the central longitudinal axes of the pistons, the printing stencil being free to move tangentially to the circumferential surface of the piston tangentially to the latter, and that the application doctor is parallel to it
  • the center longitudinal axis of the doctor blade edge, which is to be coated faces the piston circumferential surface which bears against the screen printing stencil during the printing process.
  • the pistons can be arranged vertically or horizontally.
  • the screen printing stencil and the application doctor extend vertically and that the pistons are arranged vertically on the receptacles.
  • the doctor blade hardness can be adapted to the desired thickness of the coating to be applied. If several screen printing stations arranged one behind the other on the path of the pistons to be coated are provided, the doctor blades of these stations can have the same or different hardness.
  • the pistons 1 which are fed in a standing manner by means of a continuously rotating conveyor belt 15 with their central longitudinal axis X, are removed from the conveyor belt and cyclically by a rotary head 16 with pliers 17, which grip the pistons 1 in their grooves with jaws (not shown) a gear satellite system 9, 12A, 12B, 14A, 14B pass position-controlled receptacles 18, which are arranged on a turntable 13.
  • the pistons 1 are held in a rotationally fixed manner by upwardly projecting mandrels 6, on which the pistons 1 are placed, and they are rotated by rotating the rotary table 13 at three screen printing stations A, B and C one behind the other by a step switching device are introduced, in which they receive the predetermined coatings A1, B1, C1 one after the other on their cylindrical surface.
  • These coatings are applied by means of screen printing stencils 2, which come into tangential contact with the piston peripheral surface to be coated by means of application doctor blades 10.
  • the pistons, together with their receptacles 18, are subjected to a rotation about their central longitudinal axis X (FIGS.
  • the printing stencil 2 being able to move tangentially to the circumferential surface of the piston without sliding.
  • the arrows in Fig. 2 show the direction of rotation and direction of movement of the piston peripheral surface and the screen printing stencil 2 during the printing process.
  • the application doctor blade 10 remains with its doctor blade edge, which extends parallel to the central longitudinal axis X of the piston 1 to be coated, opposite the piston circumferential surface resting on the screen printing stencil, and thereby applies the coating compound supplied to the upper region of the screen printing stencil via a hose 8 through the stencil onto the piston circumferential surface .
  • the piston 1 is provided on its piston head with a circumferential coating C3 by the screen printing station C and in the region of the piston circumference only on the sides offset to the piston pin bore 3 with coatings for coating surfaces A1, B1, C1 by the Coating stations A, B, C have been provided.
  • the coating surfaces shown in the exemplary embodiment are of course only mentioned for example. In many cases, fewer coating areas will be sufficient. For example, only two lower coating surfaces A1 can be provided, which are opposite each other and each extend over a circumferential area of approximately 90 °. The two coating areas A1 can e.g. be provided as a buffer for reducing engine knock and have a coating thickness of 10 ⁇ m.
  • two coating surfaces C1 which are likewise arranged opposite one another and are arranged at a distance and parallel to the coating surfaces A1 and possibly also B1, can be provided in particular for emergency lubrication in the event of normal oil lubrication failing.
  • the coating surfaces C1 (and possibly B1) can also extend over a circumferential area of 90 ° in each case and have e.g. a thickness of 20 ⁇ m.
  • the coating surfaces A1, B1 and C1 run out in a wedge shape 4 at their edges.
  • the coating areas can be provided with small uncoated open areas 5.
  • rectangular, elliptical and round recesses 5 are drawn in principle in the coating surfaces A1 and C1.
  • other coating areas can also be provided with corresponding open areas, for example in the form of holes, slots, strips, ellipses, ovals, circles or the like.
  • the viscosity of the coating material should be in the range of 6,000 - 8,500 cp. Very good results can be achieved with a viscosity of approx. 7,000 cp.
  • Isopropanol or ethyl glycol have been found to adjust and, if necessary, change the viscosity.
  • the excess coating compound running off the screen printing stencil is collected in a storage trough 11 located underneath the template and mixed again by means of a pump 7 via a hose line 8 and fed back to the screen printing stencil.
  • the tendency of the coating composition to change its viscosity due to disintegration is counteracted by the mixing and continuous feeding of the screen printing composition.
  • the doctor blade 10 is withdrawn from the screen printing stencil 2, causing it to come out of contact with the coated piston peripheral surface, so that the screen printing stencil can be moved back into its tangential starting position by the piston without contact.
EP90124892A 1990-07-20 1990-12-20 Procédé et appareil pour revêtir des pistons Withdrawn EP0466978A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023135A DE4023135A1 (de) 1990-07-20 1990-07-20 Verfahren und vorrichtung zum beschichten von motorkolben
DE4023135 1990-07-20

Publications (2)

Publication Number Publication Date
EP0466978A2 true EP0466978A2 (fr) 1992-01-22
EP0466978A3 EP0466978A3 (fr) 1994-12-28

Family

ID=6410704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124892A Withdrawn EP0466978A2 (fr) 1990-07-20 1990-12-20 Procédé et appareil pour revêtir des pistons

Country Status (15)

Country Link
US (1) US5314717A (fr)
EP (1) EP0466978A2 (fr)
JP (1) JPH05147189A (fr)
KR (1) KR920002919A (fr)
CN (1) CN1058453A (fr)
AR (1) AR245034A1 (fr)
AU (1) AU7822491A (fr)
BR (1) BR9103100A (fr)
CA (1) CA2043754A1 (fr)
CS (1) CS209891A3 (fr)
DE (1) DE4023135A1 (fr)
HU (1) HUT60018A (fr)
MX (1) MX9100269A (fr)
PL (1) PL290939A1 (fr)
YU (1) YU112491A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012783A1 (fr) * 1992-11-28 1994-06-09 Mahle Gmbh Ensemble piston-cylindre d'un moteur a combustion interne
WO1994023193A1 (fr) * 1993-03-31 1994-10-13 Mahle Gmbh Piston alternatif d'un moteur a combustion interne dont la surface d'usure comporte un renforcement au moins partiel
WO2001017695A2 (fr) * 1999-09-04 2001-03-15 Federal-Mogul Technology Limited Application d'un revetement a coefficient de frottement et a usure faibles
FR2982508A1 (fr) * 2011-11-14 2013-05-17 Peugeot Citroen Automobiles Sa Procede de revetement par serigraphie d'une piece de revolution

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5450784A (en) * 1993-09-28 1995-09-19 Detroit Diesel Corporation Electroplated piston skirt for improved scuff resistance
US5857440A (en) * 1996-06-07 1999-01-12 Melco Engraving, Inc. Engine piston and method for its manufacture
EP0818625B1 (fr) * 1996-07-08 2004-03-31 Kabushiki Kaisha Toyota Jidoshokki Appareil pour le revêtement de pistons de compresseurs
JPH11173264A (ja) * 1997-10-09 1999-06-29 Toyota Autom Loom Works Ltd 斜板式圧縮機
DE19824859C2 (de) * 1998-06-04 2002-09-26 Ks Kolbenschmidt Gmbh Leichtmetallkolben mit Oberflächenbewehrung
JP2000120541A (ja) * 1998-10-19 2000-04-25 Toyota Autom Loom Works Ltd ピストン及びピストンに対する溝の形成方法
JP2000170657A (ja) * 1998-12-09 2000-06-20 Toyota Autom Loom Works Ltd 圧縮機のピストン及びそのピストンのコーティング方法
KR100644951B1 (ko) 1999-01-14 2006-11-10 엔오케이 클루바 가부시키가이샤 피복층 성형기 및 그 성형방법
DE19956148A1 (de) * 1999-11-23 2001-05-31 Werner Freudenberg Verfahren und Siebdruck-Maschine zum Bedrucken von zylindrischen Körpern mit einem wendelförmigen Aufdruck
JP2001263227A (ja) * 2000-03-21 2001-09-26 Toyota Autom Loom Works Ltd 斜板式圧縮機の斜板における皮膜形成方法及びその斜板
US6682778B1 (en) 2000-04-06 2004-01-27 Van Os Enterprises Stencil to pad method for applying a coating to a part
DE10109277A1 (de) * 2001-02-26 2002-10-24 Manfred Schwarz Gleitlagerbeschichtung
FR2827807B1 (fr) * 2001-07-27 2003-10-10 Leroux Gilles Sa Dispositif modulaire d'impression graphique couleur de cartes
KR100448209B1 (ko) * 2001-09-17 2004-09-16 주식회사 리젠 바이오텍 자동 코팅기기
US7171936B2 (en) * 2003-10-23 2007-02-06 Mahle Technology, Inc. Piston having a patterned coating and method of applying same
GB2414729A (en) * 2004-06-01 2005-12-07 Atraverda Ltd Method of producing sub-oxides with a substantially moisture free gas
JP2006161563A (ja) * 2004-12-02 2006-06-22 Honda Motor Co Ltd 内燃機関のピストン
US7377206B2 (en) * 2005-12-28 2008-05-27 Mahle Technology, Inc. Piston for an internal combustion engine
JP5042373B2 (ja) * 2010-06-28 2012-10-03 日立オートモティブシステムズ株式会社 内燃機関のピストン
DE102010051319A1 (de) * 2010-11-13 2012-05-16 Mahle International Gmbh Kolben für einen Verbrennungsmotor
US8651240B1 (en) 2012-12-24 2014-02-18 United Technologies Corporation Pressurized reserve lubrication system for a gas turbine engine
JP6066836B2 (ja) * 2013-05-31 2017-01-25 株式会社クボタ エンジンのピストン
CN104960324A (zh) * 2015-06-26 2015-10-07 杭州涛兴印刷设备有限公司 一种用于活塞丝网印刷的自动印刷机构
CN105413947B (zh) * 2015-10-28 2018-11-20 芜湖市恒浩机械制造有限公司 一种活塞涂脂装置
CN105268598B (zh) * 2015-10-28 2018-07-17 芜湖市恒浩机械制造有限公司 一种活塞涂脂装置用涂抹装置
CN105856809B (zh) * 2016-04-01 2019-07-19 广州九红智能装备有限公司 一种智能化多色丝印机
CN106945394A (zh) * 2017-02-28 2017-07-14 安庆雅德帝伯活塞有限公司 一种自动上料、下料的活塞印刷树脂系统
EP3748214B1 (fr) * 2018-01-31 2023-07-26 Sankyo Seisakusho Co. Dispositif de lubrification et mécanisme de came pourvu d'un dispositif de lubrification
CN109177454A (zh) * 2018-10-23 2019-01-11 卫巍 一种多工位丝网印刷装置
CN110789995B (zh) * 2019-11-13 2024-02-09 滨州博海精工机械有限公司 一种用于四工位石墨印刷机的自动上下料装置
CN113333228B (zh) * 2021-05-31 2022-01-18 大昌汽车部件股份有限公司 一种活塞涂油系统及其控制方法
CN114227181A (zh) * 2021-12-31 2022-03-25 桐乡顺士达精密机械有限公司 一种汽车空调压缩机活塞的加工方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2209688A (en) * 1936-02-01 1940-07-30 Solar Lab Decorating machine
GB984204A (en) * 1963-02-15 1965-02-24 W R Foster Polyprint Ltd Improvements in or relating to silk screen printing apparatus
LU54833A1 (fr) * 1966-11-30 1968-02-02
FR2166999A5 (fr) * 1971-12-10 1973-08-17 Produ Ag
FR2210936A5 (fr) * 1972-12-20 1974-07-12 Dubuit Louis

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4463671A (en) * 1981-06-05 1984-08-07 Rudolph Rome R Silk-screen printing method and apparatus
JP2531224B2 (ja) * 1988-01-29 1996-09-04 トヨタ自動車株式会社 ピストンスカ―トへの被膜形成方法
JP2681967B2 (ja) * 1988-02-12 1997-11-26 トヨタ自動車株式会社 ピストン−ピストンリングアッセンブリ
US4873951A (en) * 1988-12-19 1989-10-17 Brunswick Corporation Connecting rod with polymeric coated sideface

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2209688A (en) * 1936-02-01 1940-07-30 Solar Lab Decorating machine
GB984204A (en) * 1963-02-15 1965-02-24 W R Foster Polyprint Ltd Improvements in or relating to silk screen printing apparatus
LU54833A1 (fr) * 1966-11-30 1968-02-02
FR2166999A5 (fr) * 1971-12-10 1973-08-17 Produ Ag
FR2210936A5 (fr) * 1972-12-20 1974-07-12 Dubuit Louis

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012783A1 (fr) * 1992-11-28 1994-06-09 Mahle Gmbh Ensemble piston-cylindre d'un moteur a combustion interne
US5560283A (en) * 1992-11-28 1996-10-01 Mahle Gmbh Piston-Cylinder assembly of an internal combustion engine
WO1994023193A1 (fr) * 1993-03-31 1994-10-13 Mahle Gmbh Piston alternatif d'un moteur a combustion interne dont la surface d'usure comporte un renforcement au moins partiel
WO2001017695A2 (fr) * 1999-09-04 2001-03-15 Federal-Mogul Technology Limited Application d'un revetement a coefficient de frottement et a usure faibles
WO2001017695A3 (fr) * 1999-09-04 2001-11-15 Federal Mogul Technology Ltd Application d'un revetement a coefficient de frottement et a usure faibles
FR2982508A1 (fr) * 2011-11-14 2013-05-17 Peugeot Citroen Automobiles Sa Procede de revetement par serigraphie d'une piece de revolution

Also Published As

Publication number Publication date
MX9100269A (es) 1992-02-28
CN1058453A (zh) 1992-02-05
US5314717A (en) 1994-05-24
HU912435D0 (en) 1991-12-30
AR245034A1 (es) 1993-12-30
KR920002919A (ko) 1992-02-28
CA2043754A1 (fr) 1992-01-21
HUT60018A (en) 1992-07-28
DE4023135A1 (de) 1992-01-23
EP0466978A3 (fr) 1994-12-28
AU7822491A (en) 1992-01-23
YU112491A (sh) 1994-11-15
PL290939A1 (en) 1992-06-26
BR9103100A (pt) 1992-02-11
CS209891A3 (en) 1992-02-19
JPH05147189A (ja) 1993-06-15

Similar Documents

Publication Publication Date Title
EP0466978A2 (fr) Procédé et appareil pour revêtir des pistons
EP0321590B1 (fr) Méthode et appareil pour la production d'une matrice d'estampage à bord de coupe aigu
DE2202545A1 (de) Verfahren und vorrichtung zum bedrucken von gegenstaenden
EP0956973B1 (fr) Blanchet pour l'impression avec transfert complet de l'encre
DE2833377A1 (de) Verfahren zum aufbringen von hochviskosem beschichtungsmaterial auf ein metallband sowie vorrichtung zur durchfuehrung dieses verfahrens
EP0509414B1 (fr) Unité d'impression pour une presse rotative
EP0736329A2 (fr) Dispositif pour déposer un film de revêtement sur le rouleau enducteur d'une machine d'enduction
DE10317283A1 (de) Tampondruckmaschine
EP0195378B1 (fr) Dispositif d'impression
EP0024029B1 (fr) Dispositif pour l'application de revêtements à une matière en bande, en particulier à des bandes métalliques
DE2338490C2 (de) Vorrichtung zum Abstreifen von Hohlkörpern von einem Preßstempel
DE3707269A1 (de) Ambosszylinder fuer eine bearbeitungsmaschine
DE10036756C2 (de) Verfahren und Einrichtung zum Aufbringen elastomerer Dichtauflagen auf Flachdichtungen
DE3117287C2 (de) Maschine zum Herstellen einer teilweise umlaufenden Schulter an Kolbenringen
DE3039812C2 (de) Verfahren und Vorrichtung zum Rundumlackieren von zylindrischen Hohlkörpern, wie Dosenrümpfen
EP0555730A1 (fr) Procédé et appareil pour revêtir des corps cylindriques creux
DE19628106A1 (de) Verfahren zur Bearbeitung von Zylinderaufzügen für mehrfach große Druckmaschinenzylinder, insbesondere Gegendruckzylinder von Bogenrotations-Offsetdruckmaschinen
DE2125103C2 (de) Siebdruckvorrichtung
DE814857C (de) Verfahren zum Bemustern von metallischen Oberflaechen
DE10249728A1 (de) Verfahren und Vorrichtung zum Sammeln von Blättern zwischen einer ersten und einer zweiten Bahn
DE1577786A1 (de) Verfahren und Vorrichtung zum Lackieren von endlosen Bahnen mit Aussparungen der Lackschicht
DE3609008A1 (de) Lackiereinrichtung an offsetdruckmaschinen
EP4285726A1 (fr) Ensemble rouleau de division pour produire des portions de pâte
DE2849440B1 (de) Zwischen zwei Pressen angeordnete Wendeeinrichtug fuer insbesondere flaechige Werkstuecke
DE102022113972A1 (de) Verfahren zum Abtrennen von Teigportionen aus einer Teigmasse

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: A2

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

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

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

17P Request for examination filed

Effective date: 19950130

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

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 19950904

18D Application deemed to be withdrawn

Effective date: 19960116

APAF Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNE