Ken Kumagai

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for transmission and reception
- Patent number 6,178,158
- Issue date Jan 23, 2001
- Nippon Telegraph and Telephone Corporation
- Yasunori Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital signal detecting method and detector
- Patent number 5,907,585
- Issue date May 25, 1999
- NTT Mobile Communications Network Inc.
- Yasunori Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Amplifying device having input and output nonlinear phase shifters...
- Patent number 5,796,307
- Issue date Aug 18, 1998
- NTT Mobile Communications Network Inc.
- Ken Kumagai
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Signal multiplexer and multiplexing method
- Patent number 5,790,555
- Issue date Aug 4, 1998
- NTT Mobile Communications, Network Inc.
- Shoichi Narahashi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE