Toyoji Okuwaki

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Nishitama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Magnetic recording medium
- Patent number 5,686,177
- Issue date Nov 11, 1997
- Hitachi, Ltd.
- Kazusuke Yamanaka
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic disk with surface protective layer having convex portions...
- Patent number 5,285,343
- Issue date Feb 8, 1994
- Hitachi, Ltd.
- Hideaki Tanaka
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Magnetic recorder provided with a magnetic head slider having a non...
- Patent number 5,060,098
- Issue date Oct 22, 1991
- Hitachi, Ltd.
- Akihiro Gotoh
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto-optical memory apparatus having a floating magnetic head
- Patent number 5,020,041
- Issue date May 28, 1991
- Hitachi, Ltd.
- Takeshi Nakao
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recording medium
- Patent number 4,840,844
- Issue date Jun 20, 1989
- Hitachi, Ltd.
- Masaaki Futamoto
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic disk apparatus
- Patent number 4,651,242
- Issue date Mar 17, 1987
- Hitachi, Ltd.
- Yoshiyuki Hirano
- G11 - INFORMATION STORAGE