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Heigo Ishihara
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Lubricant, magnetic disk and magnetic disk apparatus
Patent number
6,869,536
Issue date
Mar 22, 2005
Hitachi, Ltd.
Mina Ishida
G11 - INFORMATION STORAGE
Information
Patent Grant
Lubricant, magnetic disk and magnetic disk apparatus
Patent number
6,555,197
Issue date
Apr 29, 2003
Hitachi, Ltd.
Mina Ishida
G11 - INFORMATION STORAGE
Information
Patent Grant
Thin film magnetic disc and method of manufacturing the disc
Patent number
5,958,542
Issue date
Sep 28, 1999
Hitachi, Ltd.
Mitsuyoshi Ootake
B82 - NANO-TECHNOLOGY
Information
Patent Grant
Magnetic disk, and magnetic disk apparatus
Patent number
5,820,964
Issue date
Oct 13, 1998
Hitachi, Ltd.
Takayuki Nakakawaji
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium having a protective layer which includes...
Patent number
5,543,203
Issue date
Aug 6, 1996
Hitachi, Ltd.
Hiroshi Tani
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium having a lubricant layer comprising ionic...
Patent number
5,498,457
Issue date
Mar 12, 1996
Hitachi, Ltd.
Heigo Ishihara
G11 - INFORMATION STORAGE
Information
Patent Grant
Process for producing a rigid magnetic disk by longitudinally gener...
Patent number
5,180,608
Issue date
Jan 19, 1993
Hitachi, Ltd.
Katsuyoshi Chiba
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium comprising a surface treatment layer prov...
Patent number
5,093,211
Issue date
Mar 3, 1992
Hitachi, Ltd.
Takanori Kudo
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium and process for producing the same
Patent number
5,073,460
Issue date
Dec 17, 1991
Hitachi, Ltd.
Masaaki Futamoto
G11 - INFORMATION STORAGE
Information
Patent Grant
Method for magnetic orientation of magnetic recording medium using...
Patent number
5,034,243
Issue date
Jul 23, 1991
Hitachi, Ltd.
Katsuyoshi Chiba
G11 - INFORMATION STORAGE
Information
Patent Grant
Process for producing information recording medium
Patent number
5,008,128
Issue date
Apr 16, 1991
Hitachi, Ltd.
Takanori Kudo
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Magnetic recording medium and method for producing the same
Patent number
5,000,982
Issue date
Mar 19, 1991
Hitachi, Ltd.
Heigo Ishihara
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium and method for producing the same
Patent number
4,985,295
Issue date
Jan 15, 1991
Hitachi, Ltd.
Heigo Ishihara
G11 - INFORMATION STORAGE
Information
Patent Grant
Process for producing magnetic recording medium, magnetic paint, an...
Patent number
4,966,797
Issue date
Oct 30, 1990
Hitachi Ltd.
Heigo Ishihara
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium and process for producing the same
Patent number
4,957,825
Issue date
Sep 18, 1990
Hitachi, Ltd.
Masaaki Futamoto
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium
Patent number
4,794,035
Issue date
Dec 27, 1988
Hitachi, Ltd.
Heigo Ishihara
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium
Patent number
4,722,859
Issue date
Feb 2, 1988
Hitachi, Ltd.
Takanori Kudo
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording media
Patent number
4,692,378
Issue date
Sep 8, 1987
Hitachi, Ltd.
Heigo Ishihara
G11 - INFORMATION STORAGE
Information
Patent Grant
Composition of magnetic recording media
Patent number
4,238,341
Issue date
Dec 9, 1980
Hitachi, Ltd.
Yoshiki Kato
G11 - INFORMATION STORAGE
Information
Patent Grant
Method of manufacturing a paint composite for magnetic films
Patent number
4,229,312
Issue date
Oct 21, 1980
Hitachi, Ltd.
Waichi Nagashiro
G11 - INFORMATION STORAGE
Information
Patent Grant
Process for the preparation of magnetic recording medium
Patent number
4,189,508
Issue date
Feb 19, 1980
Hitachi, Ltd.
Katsuyoshi Chiba
G11 - INFORMATION STORAGE
Patents Applications
last 30 patents
Information
Patent Application
Lubricant, magnetic disk and magnetic disk apparatus
Publication number
20030175470
Publication date
Sep 18, 2003
Mina Ishida
G11 - INFORMATION STORAGE