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Masaaki Umezawa
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Tokyo, JP
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last 30 patents
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Patent Grant
Receiving filter of a saw separator with greater electrode interdig...
Patent number
6,208,223
Issue date
Mar 27, 2001
Oli Electric Industry, Co., Ltd.
Hajime Shimamura
H03 - BASIC ELECTRONIC CIRCUITRY
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Patent Grant
Telephone apparatus for radio communication with an adaptor
Patent number
5,142,573
Issue date
Aug 25, 1992
Oki Electric Industry Co., Ltd.
Masaaki Umezawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE