Kazuhiko Yoshikawa

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Interactive chargeable communication system with billing system the...
- Patent number 6,249,532
- Issue date Jun 19, 2001
- Hitachi, Ltd.
- Kazuhiko Yoshikawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Nitride layer for discharge lamps
- Patent number 5,668,440
- Issue date Sep 16, 1997
- Toshiba Lighting & Technology Corporation
- Shinji Inukai
- H01 - BASIC ELECTRIC ELEMENTS