Koichi Yamada

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Patents Grantslast 30 patents

Information Patent Grant
Pulse-width modulator and driving circuit
- Patent number 5,030,847
- Issue date Jul 9, 1991
- Rohm Co., Ltd.
- Yasuhiro Gotoh
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Apparatus for reproducing information at variable speeds from a mag...
- Patent number 4,791,507
- Issue date Dec 13, 1988
- Matsushita Electric Industrial Co., Ltd.
- Yoshiaki Doyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Helical scan magnetic recording and reproduction system with head p...
- Patent number 4,644,414
- Issue date Feb 17, 1987
- Matsushita Electric Industrial Co., Ltd.
- Koichi Yamada
- G11 - INFORMATION STORAGE