Takafumi Kojima

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Radio paging transmitter which adjusts its transmission time based...
- Patent number 5,802,453
- Issue date Sep 1, 1998
- Hitachi, Ltd.
- Yoshinori Kuroki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Radio communication system with plurality of wired lines
- Patent number 5,799,252
- Issue date Aug 25, 1998
- Hitachi, Ltd.
- Arata Nakagoshi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Radio paging system
- Patent number 5,751,935
- Issue date May 12, 1998
- Hitachi, Ltd.
- Takafumi Kojima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber line testing system
- Patent number 4,447,679
- Issue date May 8, 1984
- Hitachi, Ltd.
- Takafumi Kojima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber line testing system
- Patent number 4,392,026
- Issue date Jul 5, 1983
- Hitachi, Ltd.
- Takafumi Kojima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Ringing control apparatus
- Patent number 4,145,577
- Issue date Mar 20, 1979
- Hitachi, Ltd.
- Takafumi Kojima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE