Tadasu Otsubo

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Chigasaki, JP

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Patents Grantslast 30 patents

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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
Interactive chargeable communication system with billing system the...
- Patent number 6,002,694
- Issue date Dec 14, 1999
- Hitachi, Ltd.
- Kazuhiko Yoshizawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Video tape recorder/player
- Patent number 5,307,171
- Issue date Apr 26, 1994
- Hitachi, Ltd.
- Nobuo Azuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Magnetic video recording/reproducing apparatus for video signals of...
- Patent number 5,122,885
- Issue date Jun 16, 1992
- Hitachi, Ltd.
- Atsushi Yoshioka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE