TW405330B - Ceramic multilayer printed circuit boards with embedded passive components - Google Patents

Ceramic multilayer printed circuit boards with embedded passive components Download PDF

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Publication number
TW405330B
TW405330B TW087103293A TW87103293A TW405330B TW 405330 B TW405330 B TW 405330B TW 087103293 A TW087103293 A TW 087103293A TW 87103293 A TW87103293 A TW 87103293A TW 405330 B TW405330 B TW 405330B
Authority
TW
Taiwan
Prior art keywords
green
glass
printed
layer
stack
Prior art date
Application number
TW087103293A
Other languages
English (en)
Chinese (zh)
Inventor
Schwartz Tormey Ellen
Narayan Prabhu Ashok
A Narayanaswam Sreeram
Michael James Liberatore
Ponnusamy Palanisamy
Original Assignee
Sharp Kk
Sarnoff Corp
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
Priority claimed from US08/812,172 external-priority patent/US5866240A/en
Priority claimed from US08/812,151 external-priority patent/US5953203A/en
Priority claimed from US09/031,745 external-priority patent/US6055151A/en
Application filed by Sharp Kk, Sarnoff Corp filed Critical Sharp Kk
Application granted granted Critical
Publication of TW405330B publication Critical patent/TW405330B/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
    • H05K1/167—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed resistors
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
    • C03C8/14—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
    • C03C8/22—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions containing two or more distinct frits having different compositions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C13/00—Resistors not provided for elsewhere
    • H01C13/02—Structural combinations of resistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/30—Apparatus or processes specially adapted for manufacturing resistors adapted for baking
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/003—Thick film resistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
    • H01L23/64—Impedance arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
    • H05K1/162—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/42—Wire connectors; Manufacturing methods related thereto
    • H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L24/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01012—Magnesium [Mg]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01019—Potassium [K]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/0102—Calcium [Ca]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01039—Yttrium [Y]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01046—Palladium [Pd]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01077—Iridium [Ir]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01079—Gold [Au]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/095—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00 with a principal constituent of the material being a combination of two or more materials provided in the groups H01L2924/013 - H01L2924/0715
    • H01L2924/097—Glass-ceramics, e.g. devitrified glass
    • H01L2924/09701—Low temperature co-fired ceramic [LTCC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
    • H01L2924/1901—Structure
    • H01L2924/1904—Component type
    • H01L2924/19041—Component type being a capacitor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • H05K1/092—Dispersed materials, e.g. conductive pastes or inks
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0058—Laminating printed circuit boards onto other substrates, e.g. metallic substrates
    • H05K3/0061—Laminating printed circuit boards onto other substrates, e.g. metallic substrates onto a metallic substrate, e.g. a heat sink
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
    • H05K3/4626—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
    • H05K3/4629—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4688—Composite multilayer circuits, i.e. comprising insulating layers having different properties

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
TW087103293A 1997-03-06 1998-03-06 Ceramic multilayer printed circuit boards with embedded passive components TW405330B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US81283297A 1997-03-06 1997-03-06
US08/812,172 US5866240A (en) 1997-03-06 1997-03-06 Thick ceramic on metal multilayer circuit board
US08/812,151 US5953203A (en) 1997-03-06 1997-03-06 Multilayer ceramic circuit boards including embedded capacitors
US09/031,745 US6055151A (en) 1997-03-06 1998-02-27 Multilayer ceramic circuit boards including embedded components

Publications (1)

Publication Number Publication Date
TW405330B true TW405330B (en) 2000-09-11

Family

ID=27487928

Family Applications (1)

Application Number Title Priority Date Filing Date
TW087103293A TW405330B (en) 1997-03-06 1998-03-06 Ceramic multilayer printed circuit boards with embedded passive components

Country Status (5)

Country Link
EP (1) EP1016106A4 (de)
JP (2) JP3944791B2 (de)
KR (2) KR100516043B1 (de)
TW (1) TW405330B (de)
WO (1) WO1998039784A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6893710B2 (en) 2003-04-18 2005-05-17 Yageo Corporation Multilayer ceramic composition

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100516043B1 (ko) * 1997-03-06 2005-09-26 라미나 세라믹스, 인크. 수동 소자들이 내재된 세라믹 다층 인쇄 회로 기판
US6191934B1 (en) * 1998-10-02 2001-02-20 Sarnoff Corporation & Co., Ltd. High dielectric constant embedded capacitors
US6300267B1 (en) * 1998-11-05 2001-10-09 Sarnoff Corporation High dielectric constant buried capacitors with extended operating temperature ranges
US6349456B1 (en) * 1998-12-31 2002-02-26 Motorola, Inc. Method of manufacturing photodefined integral capacitor with self-aligned dielectric and electrodes
US6317023B1 (en) 1999-10-15 2001-11-13 E. I. Du Pont De Nemours And Company Method to embed passive components
US6455930B1 (en) * 1999-12-13 2002-09-24 Lamina Ceramics, Inc. Integrated heat sinking packages using low temperature co-fired ceramic metal circuit board technology
US6970362B1 (en) 2000-07-31 2005-11-29 Intel Corporation Electronic assemblies and systems comprising interposer with embedded capacitors
US6775150B1 (en) 2000-08-30 2004-08-10 Intel Corporation Electronic assembly comprising ceramic/organic hybrid substrate with embedded capacitors and methods of manufacture
EP1263002A3 (de) * 2001-05-17 2004-01-02 Shipley Company LLC Widerstände
EP1323682A3 (de) 2001-12-25 2004-01-21 Ngk Spark Plug Co., Ltd Dielektrisches Material und dielektrischer, gesinterter Körper, und Leiterplatte
US6860000B2 (en) 2002-02-15 2005-03-01 E.I. Du Pont De Nemours And Company Method to embed thick film components
KR20050019214A (ko) 2003-08-18 2005-03-03 한국과학기술원 내장형 커패시터용 폴리머/세라믹 복합 페이스트 및 이를이용한 커패시터 제조방법
JP5402776B2 (ja) * 2010-03-30 2014-01-29 株式会社村田製作所 金属ベース基板の製造方法

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US4061584A (en) * 1974-12-13 1977-12-06 General Electric Company High dielectric constant ink for thick film capacitors
US4415624A (en) * 1981-07-06 1983-11-15 Rca Corporation Air-fireable thick film inks
JPS5817651A (ja) * 1981-07-24 1983-02-01 Hitachi Ltd 多層回路板とその製造方法
GB2162167B (en) * 1984-06-01 1988-01-20 Narumi China Corp Ceramic substrate material
US5148005A (en) * 1984-07-10 1992-09-15 Raychem Corporation Composite circuit protection devices
JPH0725174B2 (ja) * 1985-10-18 1995-03-22 富士ゼロックス株式会社 厚膜型サ−マルヘツドの製造方法
GB2182033A (en) * 1985-10-24 1987-05-07 Stc Plc Dielectric compositions
JPS62113758A (ja) * 1985-10-25 1987-05-25 株式会社住友金属セラミックス 低温焼成セラミツクス
US5166658A (en) * 1987-09-30 1992-11-24 Raychem Corporation Electrical device comprising conductive polymers
US4961999A (en) * 1988-07-21 1990-10-09 E. I. Du Pont De Nemours And Company Thermistor composition
JP3019541B2 (ja) * 1990-11-22 2000-03-13 株式会社村田製作所 コンデンサ内蔵型配線基板およびその製造方法
US5256469A (en) * 1991-12-18 1993-10-26 General Electric Company Multi-layered, co-fired, ceramic-on-metal circuit board for microelectronic packaging
US5657199A (en) * 1992-10-21 1997-08-12 Devoe; Daniel F. Close physical mounting of leaded amplifier/receivers to through holes in monolithic, buried-substrate, multiple capacitors simultaneous with electrical connection to dual capacitors otherwise transpiring, particularly for hearing aid filters
JPH0834096A (ja) * 1994-05-20 1996-02-06 Toray Ind Inc セラミックス・グリーンシートおよびセラミックス・グリーンシート上にパターンを形成する方法
JP3093601B2 (ja) * 1994-09-28 2000-10-03 株式会社住友金属エレクトロデバイス セラミック回路基板
US5514451A (en) * 1995-01-27 1996-05-07 David Sarnoff Research Center, Inc. Conductive via fill inks for ceramic multilayer circuit boards on support substrates
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6893710B2 (en) 2003-04-18 2005-05-17 Yageo Corporation Multilayer ceramic composition

Also Published As

Publication number Publication date
KR100516043B1 (ko) 2005-09-26
EP1016106A4 (de) 2007-12-12
JP2002505805A (ja) 2002-02-19
JP2006165585A (ja) 2006-06-22
EP1016106A1 (de) 2000-07-05
WO1998039784A1 (en) 1998-09-11
KR20050043991A (ko) 2005-05-11
KR100546471B1 (ko) 2006-01-26
JP3944791B2 (ja) 2007-07-18
KR20000075996A (ko) 2000-12-26

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