DE69431385D1 - Verfahren zur Herstellung von Silizium-Halbleiterplättchen - Google Patents
Verfahren zur Herstellung von Silizium-HalbleiterplättchenInfo
- Publication number
- DE69431385D1 DE69431385D1 DE69431385T DE69431385T DE69431385D1 DE 69431385 D1 DE69431385 D1 DE 69431385D1 DE 69431385 T DE69431385 T DE 69431385T DE 69431385 T DE69431385 T DE 69431385T DE 69431385 D1 DE69431385 D1 DE 69431385D1
- Authority
- DE
- Germany
- Prior art keywords
- production
- semiconductor wafers
- silicon semiconductor
- silicon
- wafers
- 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 - Fee Related
Links
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title 1
- 239000004065 semiconductor Substances 0.000 title 1
- 229910052710 silicon Inorganic materials 0.000 title 1
- 239000010703 silicon Substances 0.000 title 1
- 235000012431 wafers Nutrition 0.000 title 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/322—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to modify their internal properties, e.g. to produce internal imperfections
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/322—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to modify their internal properties, e.g. to produce internal imperfections
- H01L21/3221—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to modify their internal properties, e.g. to produce internal imperfections of silicon bodies, e.g. for gettering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/322—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to modify their internal properties, e.g. to produce internal imperfections
- H01L21/3221—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to modify their internal properties, e.g. to produce internal imperfections of silicon bodies, e.g. for gettering
- H01L21/3225—Thermally inducing defects using oxygen present in the silicon body for intrinsic gettering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66363—Thyristors
- H01L29/66393—Lateral or planar thyristors
-
- 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
- Y10S148/00—Metal treatment
- Y10S148/06—Gettering
-
- 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
- Y10S148/00—Metal treatment
- Y10S148/061—Gettering-armorphous layers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Formation Of Insulating Films (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18160293 | 1993-07-22 | ||
JP6128959A JPH0786289A (ja) | 1993-07-22 | 1994-06-10 | 半導体シリコンウェハおよびその製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69431385D1 true DE69431385D1 (de) | 2002-10-24 |
DE69431385T2 DE69431385T2 (de) | 2003-05-15 |
Family
ID=26464517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69431385T Expired - Fee Related DE69431385T2 (de) | 1993-07-22 | 1994-07-20 | Verfahren zur Herstellung von Silizium-Halbleiterplättchen |
Country Status (5)
Country | Link |
---|---|
US (2) | US5534294A (de) |
EP (1) | EP0635879B1 (de) |
JP (1) | JPH0786289A (de) |
KR (1) | KR100232914B1 (de) |
DE (1) | DE69431385T2 (de) |
Families Citing this family (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5788763A (en) * | 1995-03-09 | 1998-08-04 | Toshiba Ceramics Co., Ltd. | Manufacturing method of a silicon wafer having a controlled BMD concentration |
JP3134719B2 (ja) * | 1995-06-23 | 2001-02-13 | 信越半導体株式会社 | 半導体ウェーハ研磨用研磨剤及び研磨方法 |
JP3545131B2 (ja) * | 1996-06-11 | 2004-07-21 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
JPH1074770A (ja) * | 1996-08-01 | 1998-03-17 | Siemens Ag | ドープされたシリコン基板 |
JPH10154713A (ja) * | 1996-11-22 | 1998-06-09 | Shin Etsu Handotai Co Ltd | シリコンウエーハの熱処理方法およびシリコンウエーハ |
CA2194653A1 (en) * | 1997-01-08 | 1998-07-08 | Junichi Matsushita | Hydrogen heat treatment method of silicon wafers using a high-purity inert substitution gas |
US5994761A (en) * | 1997-02-26 | 1999-11-30 | Memc Electronic Materials Spa | Ideal oxygen precipitating silicon wafers and oxygen out-diffusion-less process therefor |
US6190631B1 (en) * | 1997-04-09 | 2001-02-20 | Memc Electronic Materials, Inc. | Low defect density, ideal oxygen precipitating silicon |
US6146980A (en) * | 1997-06-04 | 2000-11-14 | United Microelectronics Corp. | Method for manufacturing silicon substrate having gettering capability |
US6022793A (en) * | 1997-10-21 | 2000-02-08 | Seh America, Inc. | Silicon and oxygen ion co-implantation for metallic gettering in epitaxial wafers |
JP3407629B2 (ja) * | 1997-12-17 | 2003-05-19 | 信越半導体株式会社 | シリコン単結晶ウエーハの熱処理方法ならびにシリコン単結晶ウエーハ |
JP2000031153A (ja) * | 1998-07-13 | 2000-01-28 | Shin Etsu Handotai Co Ltd | Siウエーハ及びその製造方法 |
US6828690B1 (en) * | 1998-08-05 | 2004-12-07 | Memc Electronic Materials, Inc. | Non-uniform minority carrier lifetime distributions in high performance silicon power devices |
EP1114454A2 (de) | 1998-09-02 | 2001-07-11 | MEMC Electronic Materials, Inc. | Silizium auf isolator struktur aus einem einkristallsilizium mit niedriger fehlerdichte |
US6336968B1 (en) | 1998-09-02 | 2002-01-08 | Memc Electronic Materials, Inc. | Non-oxygen precipitating czochralski silicon wafers |
WO2000013226A1 (en) | 1998-09-02 | 2000-03-09 | Memc Electronic Materials, Inc. | Process for preparing an ideal oxygen precipitating silicon wafer |
EP1624482B1 (de) * | 1998-09-02 | 2009-07-29 | MEMC Electronic Materials, Inc. | Wärmebehandelte Siliziumscheiben mit verbesserter Eigengetterung |
WO2000013209A2 (en) * | 1998-09-02 | 2000-03-09 | Memc Electronic Materials, Inc. | Thermally annealed silicon wafers having improved intrinsic gettering |
JP3264367B2 (ja) * | 1998-10-14 | 2002-03-11 | 信越半導体株式会社 | サンドブラスト処理剤、それを用いて処理されたウェーハ及びその処理方法 |
CN1296526C (zh) * | 1998-10-14 | 2007-01-24 | Memc电子材料有限公司 | 热退火后的低缺陷密度单晶硅 |
JP2000154070A (ja) * | 1998-11-16 | 2000-06-06 | Suminoe Textile Co Ltd | セラミックス三次元構造体及びその製造方法 |
JP3719021B2 (ja) | 1998-12-04 | 2005-11-24 | 信越半導体株式会社 | シリコンウエーハの製造方法およびシリコンウエーハ |
US6284384B1 (en) * | 1998-12-09 | 2001-09-04 | Memc Electronic Materials, Inc. | Epitaxial silicon wafer with intrinsic gettering |
DE19925044B4 (de) * | 1999-05-28 | 2005-07-21 | Siltronic Ag | Halbleiterscheibe mit Kristallgitter-Defekten und Verfahren zur Herstellung derselben |
US20030051656A1 (en) | 1999-06-14 | 2003-03-20 | Charles Chiun-Chieh Yang | Method for the preparation of an epitaxial silicon wafer with intrinsic gettering |
JP4748178B2 (ja) * | 1999-07-28 | 2011-08-17 | 株式会社Sumco | 点欠陥の凝集体が存在しないシリコンウェーハの製造方法 |
US6635587B1 (en) | 1999-09-23 | 2003-10-21 | Memc Electronic Materials, Inc. | Method for producing czochralski silicon free of agglomerated self-interstitial defects |
US6599815B1 (en) | 2000-06-30 | 2003-07-29 | Memc Electronic Materials, Inc. | Method and apparatus for forming a silicon wafer with a denuded zone |
KR20030021185A (ko) * | 2000-06-30 | 2003-03-12 | 엠이엠씨 일렉트로닉 머티리얼즈 인코포레이티드 | 디누디드 존을 갖는 실리콘 웨이퍼를 형성하는 방법 및 장치 |
US6339016B1 (en) | 2000-06-30 | 2002-01-15 | Memc Electronic Materials, Inc. | Method and apparatus for forming an epitaxial silicon wafer with a denuded zone |
JP4603677B2 (ja) * | 2000-11-09 | 2010-12-22 | 信越半導体株式会社 | アニールウェーハの製造方法及びアニールウェーハ |
US8529695B2 (en) | 2000-11-22 | 2013-09-10 | Sumco Corporation | Method for manufacturing a silicon wafer |
WO2002084728A1 (en) * | 2001-04-11 | 2002-10-24 | Memc Electronic Materials, Inc. | Control of thermal donor formation in high resistivity cz silicon |
TW541581B (en) * | 2001-04-20 | 2003-07-11 | Memc Electronic Materials | Method for the preparation of a semiconductor substrate with a non-uniform distribution of stabilized oxygen precipitates |
JP4566478B2 (ja) * | 2001-08-09 | 2010-10-20 | シルトロニック・ジャパン株式会社 | シリコン半導体基板およびその製造方法 |
JP2003188176A (ja) * | 2001-12-18 | 2003-07-04 | Komatsu Electronic Metals Co Ltd | シリコンウェーハおよびシリコンウェーハの製造方法 |
KR20040029231A (ko) * | 2002-09-25 | 2004-04-06 | 엘지.필립스 엘시디 주식회사 | 형광램프 및 이를 이용한 백라이트 유닛 |
US6955718B2 (en) * | 2003-07-08 | 2005-10-18 | Memc Electronic Materials, Inc. | Process for preparing a stabilized ideal oxygen precipitating silicon wafer |
US7423286B2 (en) * | 2003-09-05 | 2008-09-09 | Si2 Technologies, Inc. | Laser transfer article and method of making |
JP2005093869A (ja) * | 2003-09-19 | 2005-04-07 | Mimasu Semiconductor Industry Co Ltd | シリコンウエーハの再生方法及び再生ウエーハ |
JP2006294691A (ja) * | 2005-04-06 | 2006-10-26 | Toshiba Corp | 半導体基板及び半導体装置とその製造方法 |
US8008107B2 (en) * | 2006-12-30 | 2011-08-30 | Calisolar, Inc. | Semiconductor wafer pre-process annealing and gettering method and system for solar cell formation |
US20090004426A1 (en) * | 2007-06-29 | 2009-01-01 | Memc Electronic Materials, Inc. | Suppression of Oxygen Precipitation in Heavily Doped Single Crystal Silicon Substrates |
US20090004458A1 (en) * | 2007-06-29 | 2009-01-01 | Memc Electronic Materials, Inc. | Diffusion Control in Heavily Doped Substrates |
KR100984860B1 (ko) * | 2008-07-10 | 2010-10-04 | 주식회사 하이닉스반도체 | 웨이퍼 가공방법 |
US7977216B2 (en) * | 2008-09-29 | 2011-07-12 | Magnachip Semiconductor, Ltd. | Silicon wafer and fabrication method thereof |
CN101905877B (zh) * | 2009-06-02 | 2013-01-09 | 清华大学 | 碳纳米管膜的制备方法 |
US8999864B2 (en) * | 2009-06-03 | 2015-04-07 | Global Wafers Japan Co., Ltd. | Silicon wafer and method for heat-treating silicon wafer |
CN101993055B (zh) * | 2009-08-14 | 2013-02-13 | 清华大学 | 碳纳米管膜先驱、碳纳米管膜及其制备方法 |
WO2012111868A1 (ko) * | 2011-02-16 | 2012-08-23 | 한솔테크닉스(주) | 기판처리시스템 |
CN104285285B (zh) * | 2012-08-22 | 2017-03-01 | 富士电机株式会社 | 半导体装置的制造方法 |
CN106463403B (zh) * | 2014-06-02 | 2020-05-05 | 胜高股份有限公司 | 硅晶片及其制造方法 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4053335A (en) * | 1976-04-02 | 1977-10-11 | International Business Machines Corporation | Method of gettering using backside polycrystalline silicon |
GB2080780B (en) * | 1980-07-18 | 1983-06-29 | Secr Defence | Heat treatment of silicon slices |
AT380974B (de) * | 1982-04-06 | 1986-08-11 | Shell Austria | Verfahren zum gettern von halbleiterbauelementen |
US4548654A (en) * | 1983-06-03 | 1985-10-22 | Motorola, Inc. | Surface denuding of silicon wafer |
US4666532A (en) * | 1984-05-04 | 1987-05-19 | Monsanto Company | Denuding silicon substrates with oxygen and halogen |
JPS61135128A (ja) * | 1984-12-06 | 1986-06-23 | Toshiba Corp | 半導体装置の製造方法 |
DE3910185C2 (de) * | 1988-03-30 | 1998-09-24 | Nippon Steel Corp | Siliziumplättchen mit hervorragendem Gettervermögen und Verfahren zu dessen Herstellung |
US5189508A (en) * | 1988-03-30 | 1993-02-23 | Nippon Steel Corporation | Silicon wafer excelling in gettering ability and method for production thereof |
JPH0648686B2 (ja) * | 1988-03-30 | 1994-06-22 | 新日本製鐵株式会社 | ゲッタリング能力の優れたシリコンウェーハおよびその製造方法 |
JPH0247836A (ja) * | 1988-08-10 | 1990-02-16 | Nec Corp | 半導体装置の製造方法 |
JPH0828353B2 (ja) * | 1988-12-28 | 1996-03-21 | 東芝セラミックス株式会社 | 保管用保護被膜付きシリコンウエハ及びシリコンウエハの保管用保護被膜の形成方法 |
JP2774855B2 (ja) * | 1990-03-23 | 1998-07-09 | 新日本製鐵株式会社 | ゲッタリング効果増強シリコン基板及びその製造方法 |
JPH0453140A (ja) * | 1990-06-18 | 1992-02-20 | Fujitsu Ltd | シリコン単結晶ウエハの処理方法 |
JP3063143B2 (ja) * | 1990-10-29 | 2000-07-12 | 日本電気株式会社 | Si基板の製造方法 |
JPH04171827A (ja) * | 1990-11-05 | 1992-06-19 | Nec Yamagata Ltd | 半導体装置の製造方法 |
JP2762183B2 (ja) * | 1991-09-17 | 1998-06-04 | 三菱マテリアル株式会社 | シリコン基板の製造方法 |
JP3024409B2 (ja) * | 1992-12-25 | 2000-03-21 | 日本電気株式会社 | 半導体装置の製造方法 |
-
1994
- 1994-06-10 JP JP6128959A patent/JPH0786289A/ja active Pending
- 1994-07-19 KR KR1019940017349A patent/KR100232914B1/ko not_active IP Right Cessation
- 1994-07-20 DE DE69431385T patent/DE69431385T2/de not_active Expired - Fee Related
- 1994-07-20 EP EP94111305A patent/EP0635879B1/de not_active Expired - Lifetime
- 1994-07-22 US US08/279,007 patent/US5534294A/en not_active Expired - Lifetime
-
1995
- 1995-12-29 US US08/580,926 patent/US5738942A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0635879B1 (de) | 2002-09-18 |
DE69431385T2 (de) | 2003-05-15 |
EP0635879A3 (de) | 1996-10-23 |
US5534294A (en) | 1996-07-09 |
JPH0786289A (ja) | 1995-03-31 |
KR950004449A (ko) | 1995-02-18 |
US5738942A (en) | 1998-04-14 |
EP0635879A2 (de) | 1995-01-25 |
KR100232914B1 (ko) | 1999-12-01 |
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