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Patents Grants
last 30 patents
Information
Patent Grant
Ceramic dynamic-pressure bearing, motor having bearing, hard disk d...
Patent number
6,702,466
Issue date
Mar 9, 2004
NGK Spark Plug Co., Ltd.
Hironobu Ishikawa
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Zirconia containing ceramic ball, method for manufacturing same, ce...
Patent number
6,696,376
Issue date
Feb 24, 2004
NGK Spark Plug Co., Ltd.
Tomonori Niwa
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Ceramic dynamic pressure bearing, motor with bearing, hard disk dev...
Patent number
6,659,647
Issue date
Dec 9, 2003
NGK Spark Plug Co., Ltd.
Atsutoshi Sugiyama
G11 - INFORMATION STORAGE
Information
Patent Grant
Ceramic dynamic pressure bearing, motor with bearing, hard disc app...
Patent number
6,619,848
Issue date
Sep 16, 2003
NGK Spark Plug Co., Ltd.
Hironobu Ishikawa
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Ceramic dynamic-pressure bearing, motor having bearing, hard disk d...
Patent number
6,619,847
Issue date
Sep 16, 2003
NGK Spark Plug Co., Ltd.
Hironobu Ishikawa
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Ceramic ball for bearing and ceramic ball bearing using the same
Patent number
6,589,448
Issue date
Jul 8, 2003
NGK Spark Plug Co., Ltd.
Tomonori Niwa
G11 - INFORMATION STORAGE
Information
Patent Grant
Conductive ceramic bearing ball, ball bearing, motor having bearing...
Patent number
6,508,591
Issue date
Jan 21, 2003
NGK Spark Plug Co., Ltd.
Tomonori Niwa
G11 - INFORMATION STORAGE
Information
Patent Grant
Method of manufacturing spherical bodies by rotation, spherical bod...
Patent number
6,464,906
Issue date
Oct 15, 2002
NGK Spark Plug Co., Ltd.
Tomonori Niwa
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Sintered ceramic bodies and ceramic working tools
Patent number
5,994,250
Issue date
Nov 30, 1999
NGK Spark Plug Company Limited
Keiji Suzuki
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Sintered ceramic bodies and ceramic metal working tools
Patent number
5,916,833
Issue date
Jun 29, 1999
NGK Spark Plug Company Limited
Keiji Suzuki
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Car kiln wheel having silicon nitride rotating members
Patent number
5,600,867
Issue date
Feb 11, 1997
NGK Spark Plug Co., Ltd.
Tomonori Niwa
B60 - VEHICLES IN GENERAL
Patents Applications
last 30 patents
Information
Patent Application
High-purity alumina sintered body, high-purity alumina ball, jig fo...
Publication number
20030008765
Publication date
Jan 9, 2003
NGK SPARK PLUG CO., LTD.
Tomonori Niwa
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Application
Ceramic dynamic-pressure bearing, motor having bearing, hard disk d...
Publication number
20020186903
Publication date
Dec 12, 2002
NGK SPARK PLUG CO., LTD.
Hironobu Ishikawa
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Application
Ceramic dynamic pressure bearing, motor with bearing, hard disc app...
Publication number
20020159659
Publication date
Oct 31, 2002
NGK SPARK PLUG CO., LTD.
Hironobu Ishikawa
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Application
Ceramic dynamic pressure bearing, motor with bearing, hard disk dev...
Publication number
20020154840
Publication date
Oct 24, 2002
NGK SPARK PLUG CO., LTD.
Atsutoshi Sugiyama
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Application
Conductive ceramic bearing ball, ball bearing, motor having bearing...
Publication number
20020044705
Publication date
Apr 18, 2002
NGK SPARK PLUG CO., LTD.
Tomonori Niwa
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Application
Ceramic ball, ball bearing, motor having bearing, hard disk drive,...
Publication number
20020039459
Publication date
Apr 4, 2002
NGK SPARK PLUG CO., LTD.
Tomonori Niwa
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Application
Silicon nitride sintered body, silicon nitride ball, silicon nitrid...
Publication number
20020037803
Publication date
Mar 28, 2002
NGK SPARK PLUG CO., LTD.
Tomonori Niwa
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Application
Ceramic ball for bearing and ceramic ball bearing using the same
Publication number
20020003228
Publication date
Jan 10, 2002
Tomonori Niwa
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Application
High-purity alumina sintered body, high-purity alumina ball, jig fo...
Publication number
20010054443
Publication date
Dec 27, 2001
NGK SPARK PLUG CO., LTD.
Tomonori Niwa
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Application
Zirconia containing ceramic ball, method for manufacturing same, ce...
Publication number
20010039237
Publication date
Nov 8, 2001
Tomonori Niwa
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES