JPS6156206A - 粉末金属物品の形成方法 - Google Patents
粉末金属物品の形成方法Info
- Publication number
- JPS6156206A JPS6156206A JP60164989A JP16498985A JPS6156206A JP S6156206 A JPS6156206 A JP S6156206A JP 60164989 A JP60164989 A JP 60164989A JP 16498985 A JP16498985 A JP 16498985A JP S6156206 A JPS6156206 A JP S6156206A
- Authority
- JP
- Japan
- Prior art keywords
- container
- metal powder
- blocks
- forming
- permeable material
- 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
Links
- 229910052751 metal Inorganic materials 0.000 title claims description 191
- 239000002184 metal Substances 0.000 title claims description 191
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 239000000843 powder Substances 0.000 claims description 135
- 238000000034 method Methods 0.000 claims description 120
- 239000012530 fluid Substances 0.000 claims description 104
- 239000000463 material Substances 0.000 claims description 88
- 230000008569 process Effects 0.000 claims description 55
- 239000000919 ceramic Substances 0.000 claims description 43
- 239000002002 slurry Substances 0.000 claims description 32
- 238000003825 pressing Methods 0.000 claims description 18
- 230000009471 action Effects 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 13
- 238000009713 electroplating Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000007598 dipping method Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 230000004323 axial length Effects 0.000 claims 2
- 230000003247 decreasing effect Effects 0.000 claims 2
- 238000007493 shaping process Methods 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 26
- 229910010293 ceramic material Inorganic materials 0.000 description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 14
- 238000005452 bending Methods 0.000 description 14
- 229910052759 nickel Inorganic materials 0.000 description 13
- 238000000462 isostatic pressing Methods 0.000 description 11
- 238000001513 hot isostatic pressing Methods 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910000601 superalloy Inorganic materials 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011236 particulate material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 240000005561 Musa balbisiana Species 0.000 description 1
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1216—Container composition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1258—Container manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1258—Container manufacturing
- B22F3/1275—Container manufacturing by coating a model and eliminating the model before consolidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/04—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/001—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a flexible element, e.g. diaphragm, urged by fluid pressure; Isostatic presses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/49336—Blade making
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Powder Metallurgy (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US634684 | 1984-07-25 | ||
| US06/634,684 US4772450A (en) | 1984-07-25 | 1984-07-25 | Methods of forming powdered metal articles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6156206A true JPS6156206A (ja) | 1986-03-20 |
| JPH0156121B2 JPH0156121B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1989-11-29 |
Family
ID=24544810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60164989A Granted JPS6156206A (ja) | 1984-07-25 | 1985-07-25 | 粉末金属物品の形成方法 |
Country Status (5)
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4738961A (en) * | 1981-08-10 | 1988-04-19 | Sankyo Company, Limited | Pyridazinone derivatives, their preparation and their use in agricultural compositions and the treatment of seed and plants |
| JP2002370720A (ja) * | 2001-06-13 | 2002-12-24 | Os Seiko:Kk | 包装装置 |
| JP2014508888A (ja) * | 2011-03-01 | 2014-04-10 | スネクマ | タービンエンジンブレード補強材などの金属部品を製造するプロセス |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4861546A (en) * | 1987-12-23 | 1989-08-29 | Precision Castparts Corp. | Method of forming a metal article from powdered metal |
| JPH0726629B2 (ja) * | 1989-04-28 | 1995-03-29 | 住友電気工業株式会社 | コンプレツサー用鉄基焼結羽根 |
| US5049329A (en) * | 1989-10-30 | 1991-09-17 | Corning Incorporated | Process for forming ceramic matrix composites |
| DE4041104C1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1990-12-21 | 1992-06-04 | Mtu Muenchen Gmbh | |
| US5130084A (en) * | 1990-12-24 | 1992-07-14 | United Technologies Corporation | Powder forging of hollow articles |
| US5897407A (en) * | 1996-05-24 | 1999-04-27 | Mendelson; Harold | Impeller |
| US5820348A (en) | 1996-09-17 | 1998-10-13 | Fricke; J. Robert | Damping system for vibrating members |
| US6190133B1 (en) * | 1998-08-14 | 2001-02-20 | Allison Engine Company | High stiffness airoil and method of manufacture |
| DE19956444B4 (de) * | 1999-11-24 | 2004-08-26 | Mtu Aero Engines Gmbh | Verfahren zur Herstellung eines Leichtbauteils in Verbundbauweise |
| US6709771B2 (en) | 2002-05-24 | 2004-03-23 | Siemens Westinghouse Power Corporation | Hybrid single crystal-powder metallurgy turbine component |
| US6939508B2 (en) * | 2002-10-24 | 2005-09-06 | The Boeing Company | Method of manufacturing net-shaped bimetallic parts |
| CN1218814C (zh) * | 2003-12-15 | 2005-09-14 | 高峻峰 | 金属或陶瓷结合剂超硬磨具的制造方法 |
| ITTO20040169A1 (it) * | 2004-03-15 | 2004-06-15 | Teksid Aluminum S R L | Sistema di tenuta per recipienti ad alte pressioni ed alte temperature |
| GB0607228D0 (en) * | 2006-04-11 | 2006-05-17 | Rolls Royce Plc | A method of manufacturing a hollow article |
| US9399258B2 (en) * | 2009-09-10 | 2016-07-26 | Aerojet Rocketdyne Of De, Inc. | Method of processing a bimetallic part |
| EP2570674A1 (en) * | 2011-09-15 | 2013-03-20 | Sandvik Intellectual Property AB | Erosion resistant impeller vane made of metallic laminate |
| GB201209567D0 (en) | 2012-05-30 | 2012-07-11 | Rolls Royce Plc | An apparatus and a method of manufacturing an article from powder material |
| BE1022809B1 (fr) * | 2015-03-05 | 2016-09-13 | Techspace Aero S.A. | Aube composite de compresseur de turbomachine axiale |
| DE102015012004A1 (de) * | 2015-09-18 | 2017-03-23 | Gkn Sinter Metals Engineering Gmbh | Sinterpresse mit axial kontrollierter Verformung und Verfahren hierzu |
| EP3170609A1 (de) * | 2015-11-19 | 2017-05-24 | MTU Aero Engines GmbH | Verfahren zum herstellen eines beschaufelten rotors für eine strömungsmaschine ; entsprechender beschaufelter rotor |
| US10328489B1 (en) | 2015-12-29 | 2019-06-25 | United Technologies Corporation | Dynamic bonding of powder metallurgy materials |
| EP3187284B1 (en) * | 2015-12-29 | 2020-02-05 | United Technologies Corporation | Dynamic bonding of powder metallurgy materials |
| EP3273000A1 (en) * | 2016-07-18 | 2018-01-24 | Siemens Aktiengesellschaft | A turbomachine component having a platform cavity with a stress reduction feature |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS587683A (ja) * | 1981-07-07 | 1983-01-17 | 株式会社リコー | 画像表示装置 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2725288A (en) * | 1952-08-26 | 1955-11-29 | Harry W Dodds | Process and apparatus for fabricating metallic articles |
| US3249964A (en) * | 1963-09-09 | 1966-05-10 | Stackpole Carbon Co | Producing dense articles from powdered carbon and other materials |
| FR1445993A (fr) * | 1965-08-31 | 1966-07-15 | Asea Ab | Procédé pour la fabrication de pièces en matériaux pulvérulents |
| US3419935A (en) * | 1966-12-19 | 1969-01-07 | Atomic Energy Commission Usa | Hot-isostatic-pressing apparatus |
| US3700435A (en) * | 1971-03-01 | 1972-10-24 | Crucible Inc | Method for making powder metallurgy shapes |
| US3832100A (en) * | 1973-01-05 | 1974-08-27 | Gleason Works | Tooling for receiving and supporting a quantity of powder material to be pressed into a self-supporting compact |
| FR2255129B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1973-12-19 | 1980-11-07 | Messerschmitt Boelkow Blohm | |
| US3982934A (en) * | 1974-05-31 | 1976-09-28 | United Technologies Corporation | Method of forming uniform density articles from powder metals |
| DD120615A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1975-07-15 | 1976-06-20 | ||
| US4023966A (en) * | 1975-11-06 | 1977-05-17 | United Technologies Corporation | Method of hot isostatic compaction |
| DE2724524B2 (de) * | 1976-06-03 | 1979-04-05 | Kelsey-Hayes Co., Romulus, Mich. (V.St.A.) | Behalter zum Heißpressen von Formkörpern verwickelter Gestalt aus Pulver |
| FR2376713A1 (fr) * | 1977-01-11 | 1978-08-04 | Carbox Ab | Appareil pour le compactage isostatique de materiaux pulverulents et analogues |
| GB1582651A (en) * | 1977-04-01 | 1981-01-14 | Rolls Royce | Products formed by powder metallurgy and a method therefore |
| DE3049424A1 (de) * | 1980-12-30 | 1982-07-22 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Vorrichtung und verfahren zum heissisostatischen pressen geometrisch komplizierter, pulvermetallurgischer pressstuecke |
| CA1203659A (en) * | 1982-03-26 | 1986-04-29 | Karl S. Brosius | Ceramic mold and method of production |
| US4428906A (en) * | 1982-04-28 | 1984-01-31 | Kelsey-Hayes Company | Pressure transmitting medium and method for utilizing same to densify material |
-
1984
- 1984-07-25 US US06/634,684 patent/US4772450A/en not_active Expired - Fee Related
-
1985
- 1985-07-19 DE DE8585305176T patent/DE3573743D1/de not_active Expired
- 1985-07-19 EP EP85305176A patent/EP0172658B1/en not_active Expired
- 1985-07-23 IL IL75892A patent/IL75892A/xx not_active IP Right Cessation
- 1985-07-25 JP JP60164989A patent/JPS6156206A/ja active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS587683A (ja) * | 1981-07-07 | 1983-01-17 | 株式会社リコー | 画像表示装置 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4738961A (en) * | 1981-08-10 | 1988-04-19 | Sankyo Company, Limited | Pyridazinone derivatives, their preparation and their use in agricultural compositions and the treatment of seed and plants |
| JP2002370720A (ja) * | 2001-06-13 | 2002-12-24 | Os Seiko:Kk | 包装装置 |
| JP2014508888A (ja) * | 2011-03-01 | 2014-04-10 | スネクマ | タービンエンジンブレード補強材などの金属部品を製造するプロセス |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3573743D1 (en) | 1989-11-23 |
| US4772450A (en) | 1988-09-20 |
| IL75892A0 (en) | 1985-12-31 |
| JPH0156121B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1989-11-29 |
| IL75892A (en) | 1990-02-09 |
| EP0172658B1 (en) | 1989-10-18 |
| EP0172658A1 (en) | 1986-02-26 |
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