DE68922157D1 - Poröses keramisches Filter mit Bienenwabenstruktur und Verfahren zu seiner Herstellung. - Google Patents
Poröses keramisches Filter mit Bienenwabenstruktur und Verfahren zu seiner Herstellung.Info
- Publication number
- DE68922157D1 DE68922157D1 DE68922157T DE68922157T DE68922157D1 DE 68922157 D1 DE68922157 D1 DE 68922157D1 DE 68922157 T DE68922157 T DE 68922157T DE 68922157 T DE68922157 T DE 68922157T DE 68922157 D1 DE68922157 D1 DE 68922157D1
- Authority
- DE
- Germany
- Prior art keywords
- production
- honeycomb structure
- porous ceramic
- ceramic filter
- filter
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
- B01D39/2075—Other inorganic materials, e.g. ceramics the material being particulate or granular sintered or bonded by inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
-
- 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
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/30—Exhaust treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63201657A JP2578176B2 (ja) | 1988-08-12 | 1988-08-12 | 多孔質セラミックハニカムフィルターおよびその製法 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE68922157D1 true DE68922157D1 (de) | 1995-05-18 |
DE68922157T2 DE68922157T2 (de) | 1995-11-30 |
Family
ID=16444729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE68922157T Expired - Lifetime DE68922157T2 (de) | 1988-08-12 | 1989-08-02 | Poröses keramisches Filter mit Bienenwabenstruktur und Verfahren zu seiner Herstellung. |
Country Status (4)
Country | Link |
---|---|
US (1) | US5069697A (de) |
EP (1) | EP0354721B1 (de) |
JP (1) | JP2578176B2 (de) |
DE (1) | DE68922157T2 (de) |
Families Citing this family (60)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0738930B2 (ja) * | 1990-03-30 | 1995-05-01 | 日本碍子株式会社 | 多孔質セラミックフィルタの製法 |
US5114644A (en) * | 1991-02-13 | 1992-05-19 | Corning Incorporated | Fabrication of cordierite bodies |
US5114643A (en) * | 1991-02-13 | 1992-05-19 | Corning Incorporated | Fabrication of cordierite bodies |
JPH0751459B2 (ja) * | 1991-05-17 | 1995-06-05 | 日本碍子株式会社 | コージェライト質ハニカム構造体の製造法 |
US5258150A (en) * | 1991-12-06 | 1993-11-02 | Corning Incorporated | Fabrication of low thermal expansion, high porosity cordierite body |
US5183608A (en) * | 1992-01-03 | 1993-02-02 | Corning Incorporated | Method of making diesel particulate filters |
US5256360A (en) * | 1992-03-25 | 1993-10-26 | Panasonic Technologies, Inc. | Method of manufacturing a precision micro-filter |
JPH05306614A (ja) * | 1992-04-28 | 1993-11-19 | Matsushita Electric Ind Co Ltd | 排気ガスフィルタとその製造方法 |
ES2051639B1 (es) * | 1992-06-30 | 1995-01-16 | Nalon Quimica Sa | Procedimiento para obtencion de soportes ceramicos de catalizadores para el tratamiento de los gases emitidos por motores de combustion interna, y soporte ceramico asi obtenido. |
DE4339167B4 (de) * | 1992-11-20 | 2006-09-14 | Corning Inc. | Verfahren zur Herstellung von Cordieritkörpern |
US5409870A (en) * | 1992-11-20 | 1995-04-25 | Corning Incorporated | Modified cordierite precursors |
US5472468A (en) * | 1993-02-25 | 1995-12-05 | Sumitomo Chemical Company, Limited | Exhaust gas filter element |
DE69401031T2 (de) * | 1993-06-04 | 1997-04-30 | Millipore Corp | Filterelement aus Metall mit hohem Wirkungsgrad und Verfahren zu dessen Herstellung |
JP2870369B2 (ja) * | 1993-06-18 | 1999-03-17 | 住友電気工業株式会社 | 排気ガス浄化用フィルター |
JP2938740B2 (ja) * | 1993-12-14 | 1999-08-25 | 日本碍子株式会社 | コージェライト質セラミックフィルタとその製造方法 |
JP2726616B2 (ja) * | 1993-12-15 | 1998-03-11 | 日本碍子株式会社 | 多孔質セラミックハニカムフィルタ |
JP3288536B2 (ja) * | 1994-06-21 | 2002-06-04 | 日本碍子株式会社 | 排ガスフィルタおよびそれを使用した排ガス処理装置 |
JPH1013129A (ja) * | 1996-06-25 | 1998-01-16 | Sumitomo Electric Ind Ltd | レドーム |
JP3555382B2 (ja) * | 1997-04-22 | 2004-08-18 | 松下電器産業株式会社 | 排ガスフィルターとその製造方法及びこの排ガスフィルターを備えたディーゼルエンジン |
JP3359596B2 (ja) * | 1999-07-22 | 2002-12-24 | 日本碍子株式会社 | キャニング構造体およびその作製方法 |
US6206944B1 (en) * | 1999-10-15 | 2001-03-27 | Corning Incorporated | Low aspect ratio diesel exhaust filter |
US6290743B1 (en) | 1999-12-20 | 2001-09-18 | Siemens Westinghouse Power Corporation | Tubular and honeycomb metal fail-safe regenerator devices |
DE10013366C1 (de) * | 2000-03-14 | 2001-08-09 | Tami Deutschland Gmbh | Verfahren zur Herstellung eines monolithischen, porösen keramischen Formkörpers aus TiO¶2¶ |
JP3756721B2 (ja) * | 2000-03-24 | 2006-03-15 | 日本碍子株式会社 | 排ガス浄化用フィルター |
JP2001269522A (ja) * | 2000-03-27 | 2001-10-02 | Ngk Insulators Ltd | 多孔質セラミックス焼結体製フィルター |
US6398837B1 (en) | 2000-06-05 | 2002-06-04 | Siemens Westinghouse Power Corporation | Metal-ceramic composite candle filters |
JP4094830B2 (ja) * | 2000-11-24 | 2008-06-04 | 日本碍子株式会社 | 多孔質ハニカムフィルター及びその製造方法 |
JP3925225B2 (ja) * | 2001-03-28 | 2007-06-06 | 株式会社デンソー | 排ガス浄化フィルタ及びその製造方法 |
JP3727550B2 (ja) * | 2001-05-30 | 2005-12-14 | 株式会社デンソー | 排ガス浄化フィルタ及びその製造方法 |
CN100523446C (zh) * | 2001-09-13 | 2009-08-05 | 日立金属株式会社 | 陶瓷蜂窝状过滤器及其制造方法 |
US6827754B2 (en) * | 2001-09-13 | 2004-12-07 | Hitachi Metals, Ltd. | Ceramic honeycomb filter |
ATE372449T1 (de) * | 2001-12-03 | 2007-09-15 | Hitachi Metals Ltd | Keramischer wabenfilter |
JP2003277162A (ja) | 2002-01-21 | 2003-10-02 | Ngk Insulators Ltd | 多孔質ハニカム構造体、その用途及びその製造方法 |
WO2003074151A1 (fr) * | 2002-03-01 | 2003-09-12 | Zakrytoe Aktsionernoe Obschestvo Nauchno-Tekhnicheskiy Tsentr 'bakor' | Element filtrant ceramique et son procede de fabrication |
CN100365252C (zh) † | 2002-03-04 | 2008-01-30 | 揖斐电株式会社 | 废气净化用蜂巢式过滤器以及废气净化装置 |
JP4750343B2 (ja) * | 2002-10-23 | 2011-08-17 | 日本碍子株式会社 | 多孔質ハニカム構造体の製造方法、及びハニカム成形体 |
US7225613B2 (en) * | 2005-01-26 | 2007-06-05 | Ford Global Technologies, Llc | Diesel engine after treatment device for conversion of nitrogen oxide and particulate matter |
ATE540907T1 (de) * | 2005-11-30 | 2012-01-15 | Corning Inc | Poröser keramikwabenfilter mit gesteuerter porengrössenverteilung |
US7485170B2 (en) * | 2005-11-30 | 2009-02-03 | Corning Incorporated | Narrow pore size distribution cordierite ceramic honeycomb articles and methods for manufacturing same |
CN101395099A (zh) | 2006-03-07 | 2009-03-25 | 日本碍子株式会社 | 陶瓷结构体及其制造方法 |
US8298311B2 (en) * | 2006-11-15 | 2012-10-30 | Corning Incorporated | Filters with controlled submicron porosity |
US7981188B2 (en) * | 2006-11-30 | 2011-07-19 | Corning Incorporated | Controlled pore size distribution porous ceramic honeycomb filter, honeycomb green body, batch mixture and manufacturing method therefor |
FR2916366B1 (fr) * | 2007-05-23 | 2009-11-27 | Saint Gobain Ct Recherches | Filtre a particules texture pour applications catalytiques |
WO2008150421A1 (en) * | 2007-05-31 | 2008-12-11 | Corning Incorporated | Aluminum titanate ceramic forming batch mixtures and green bodies with pore former |
EP2188228B1 (de) * | 2007-08-31 | 2018-09-26 | Corning Incorporated | Cordierit-wabenartikel und herstellungsverfahren |
JP5189832B2 (ja) | 2007-12-13 | 2013-04-24 | 日本碍子株式会社 | 炭化珪素質多孔体 |
US20100050604A1 (en) * | 2008-08-28 | 2010-03-04 | John William Hoard | SCR-LNT CATALYST COMBINATION FOR IMPROVED NOx CONTROL OF LEAN GASOLINE AND DIESEL ENGINES |
US8844274B2 (en) * | 2009-01-09 | 2014-09-30 | Ford Global Technologies, Llc | Compact diesel engine exhaust treatment system |
US8231701B2 (en) * | 2009-01-21 | 2012-07-31 | Corning Incorporated | Particulate filters and methods for regenerating particulate filters |
US8062618B2 (en) * | 2009-04-17 | 2011-11-22 | Ford Global Technologies, Llc | Exhaust aftertreatment system and method of treating exhaust gas |
US8389101B2 (en) * | 2009-05-29 | 2013-03-05 | Corning Incorporated | Lanthanum-containing cordierite body and method of manufacture |
US9074504B2 (en) * | 2009-09-04 | 2015-07-07 | Hitachi Metals, Ltd. | Ceramic honeycomb structure and its production method |
US9334191B2 (en) | 2010-05-28 | 2016-05-10 | Corning Incorporated | Methods for forming ceramic honeycomb articles |
US9856177B2 (en) | 2010-05-28 | 2018-01-02 | Corning Incorporated | Cordierite porous ceramic honeycomb articles |
US9441517B2 (en) * | 2010-09-02 | 2016-09-13 | Ford Global Technologies, Llc | Diesel engine exhaust treatment system |
US8137648B2 (en) * | 2010-10-12 | 2012-03-20 | Ford Global Technologies, Llc | Diesel engine exhaust treatment system and method including a platinum group metal trapping device |
US20110165040A1 (en) | 2010-11-03 | 2011-07-07 | Ford Global Technologies, Llc | Device for remediating emissions and method of manufacture |
US8999224B2 (en) * | 2010-11-30 | 2015-04-07 | Corning Incorporated | Cordierite porous ceramic honeycomb articles with delayed microcrack evolution |
CN106220224B (zh) * | 2016-07-08 | 2020-09-22 | 南京维能窑炉科技有限公司 | 一种具有双重孔结构的耐高温轻质绝热材料及其制备方法 |
CN110606768A (zh) * | 2019-10-15 | 2019-12-24 | 北京交通大学 | 堇青石多孔陶瓷膜支撑体及其近净尺寸制备方法 |
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US3950175A (en) * | 1973-11-05 | 1976-04-13 | Corning Glass Works | Pore size control in cordierite ceramic |
JPS51123966A (en) * | 1975-04-22 | 1976-10-29 | Sumitomo Chem Co Ltd | Removing method of dust contained in a combustion exhaust gas |
US4191721A (en) * | 1977-10-06 | 1980-03-04 | General Electric Company | Making ceramic articles having a high degree of porosity and crushability characteristics |
US4191720A (en) * | 1977-10-06 | 1980-03-04 | General Electric Company | Method for making porous, crushable core having an integral outer barrier layer |
JPS55137022A (en) * | 1979-04-14 | 1980-10-25 | Ngk Insulators Ltd | High temperature use ceramic filter |
US4407967A (en) * | 1979-08-16 | 1983-10-04 | Frenchtown American Corp. | Method for producing spheroidal ceramics |
US4264346A (en) * | 1979-12-12 | 1981-04-28 | General Motors Corporation | Diesel exhaust particulate traps |
US4278544A (en) * | 1980-03-26 | 1981-07-14 | Aikoh, Co., Ltd. | Filter medium for fluid |
JPS577217A (en) * | 1980-06-16 | 1982-01-14 | Ngk Insulators Ltd | Ceramic honeycomb filter and preparation thereof |
JPS5742316A (en) * | 1980-08-28 | 1982-03-09 | Ngk Insulators Ltd | Ceramic honeycomb filter |
JPS5742317A (en) * | 1980-08-28 | 1982-03-09 | Ngk Insulators Ltd | Ceramic honeycomb filter |
JPS5749009A (en) * | 1980-09-09 | 1982-03-20 | Toyota Motor Corp | Exhaust gas filter for internal combustion engine |
JPS5870814A (ja) * | 1981-10-20 | 1983-04-27 | Nippon Soken Inc | 排気ガス浄化用構造物 |
JPS57187013A (en) * | 1981-05-11 | 1982-11-17 | Toyota Motor Corp | Waste gas filter |
US4455180A (en) * | 1981-08-24 | 1984-06-19 | Corning Glass Works | Method of fabricating a sintered and selectively plugged honeycomb structure |
US4432918A (en) * | 1981-08-24 | 1984-02-21 | Corning Glass Works | Methods for fabricating selectively plugged honeycomb structures |
JPS58139717A (ja) * | 1982-02-15 | 1983-08-19 | Toyota Motor Corp | 内燃機関の排出ガス浄化用フイルタ |
US4419108A (en) * | 1982-02-22 | 1983-12-06 | Corning Glass Works | Filter apparatus and method of filtering |
US4416675A (en) * | 1982-02-22 | 1983-11-22 | Corning Glass Works | High capacity solid particulate filter apparatus |
US4417908A (en) * | 1982-02-22 | 1983-11-29 | Corning Glass Works | Honeycomb filter and method of making it |
JPS58159828A (ja) * | 1982-03-19 | 1983-09-22 | Toyota Motor Corp | 内燃機関の排出ガスフイルタおよびその製造方法 |
JPS60141667A (ja) * | 1983-12-28 | 1985-07-26 | 日本碍子株式会社 | セラミックハニカム構造体を接合若しくはコーティングまたは封着するためのセラミック材料組成物 |
JPS6154750A (ja) * | 1984-08-24 | 1986-03-19 | Toshiba Corp | 秘話通信方式 |
JPS61129015A (ja) * | 1984-11-24 | 1986-06-17 | Nippon Denso Co Ltd | 排出ガス浄化用フイルタおよびその製造方法 |
DE3501182A1 (de) * | 1985-01-16 | 1986-07-17 | Daimler-Benz Ag, 7000 Stuttgart | Abgasfilter fuer dieselmotoren |
JPS61178038A (ja) * | 1985-02-04 | 1986-08-09 | Ngk Insulators Ltd | 燃焼機器用浄化触媒担体 |
JPH062204B2 (ja) * | 1985-06-24 | 1994-01-12 | 日本電装株式会社 | セラミツク構造体 |
JPS6226312A (ja) * | 1985-07-25 | 1987-02-04 | Asahi Glass Co Ltd | 集塵器 |
DE3680496D1 (de) * | 1985-12-27 | 1991-08-29 | Ngk Insulators Ltd | Gegenstand aus cordierit mit honigwabenstruktur und methode zu dessen produktion. |
JPS6331517A (ja) * | 1986-07-24 | 1988-02-10 | Asahi Glass Co Ltd | セラミツクフイルタ |
JPS63185425A (ja) * | 1987-01-28 | 1988-08-01 | Ngk Insulators Ltd | 排ガス浄化用セラミツクハニカムフイルタ |
US4869944A (en) * | 1987-02-12 | 1989-09-26 | Ngk Insulators, Ltd. | Cordierite honeycomb-structural body and a method for producing the same |
-
1988
- 1988-08-12 JP JP63201657A patent/JP2578176B2/ja not_active Expired - Lifetime
-
1989
- 1989-08-02 DE DE68922157T patent/DE68922157T2/de not_active Expired - Lifetime
- 1989-08-02 EP EP89307877A patent/EP0354721B1/de not_active Expired - Lifetime
- 1989-08-03 US US07/389,336 patent/US5069697A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0354721B1 (de) | 1995-04-12 |
DE68922157T2 (de) | 1995-11-30 |
JP2578176B2 (ja) | 1997-02-05 |
JPH0252015A (ja) | 1990-02-21 |
US5069697A (en) | 1991-12-03 |
EP0354721A2 (de) | 1990-02-14 |
EP0354721A3 (de) | 1991-01-30 |
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