Katsumi Kikawa

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Ichikawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical repeater having loop-back function used in transmission system
- Patent number 5,296,957
- Issue date Mar 22, 1994
- Fujitsu Limited
- Masaaki Takahashi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical repeater off-state supervisory method and device therefor
- Patent number 5,293,260
- Issue date Mar 8, 1994
- Fujitsu Limited
- Katsumi Kikawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical repeater haivng means for preventing malfunction due to the...
- Patent number 5,130,837
- Issue date Jul 14, 1992
- Fujitsu Limited
- Mitsuo Kitamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE