Hajime Machida

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Tokyo, JP

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Patents Grantslast 30 patents

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Double-layer magneto-optical recording method without using an init...
- Patent number 5,461,595
- Issue date Oct 24, 1995
- Ricoh Company, Ltd.
- Hajime Machida
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of magneto-optical recording and overwriting
- Patent number 5,420,836
- Issue date May 30, 1995
- Ricoh Company, Ltd.
- Hajime Machida
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto-optical recording medium
- Patent number 4,883,710
- Issue date Nov 28, 1989
- Ricoh Company, Ltd.
- Hajime Machida
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto-optical recording medium
- Patent number 4,839,226
- Issue date Jun 13, 1989
- Ricoh Company, Ltd.
- Yasuo Sawada
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of preparing hexagonal ferrite element
- Patent number 4,816,292
- Issue date Mar 28, 1989
- Ricoh Company, Ltd.
- Hajime Machida
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto optical recording medium
- Patent number 4,690,861
- Issue date Sep 1, 1987
- Ricoh Co., Ltd.
- Hitoshi Nakamura
- G11 - INFORMATION STORAGE
Information Patent Grant
Thermomagnetic recording
- Patent number 4,466,004
- Issue date Aug 14, 1984
- Ricoh Company, Ltd.
- Hiroshi Kobayashi
- G11 - INFORMATION STORAGE