Inventor

NAKAGAWA SADAYOSHI

4 patents

Patents

4 patents

US4456796AJun 26, 1984

Unidirectional electret microphone

HOSIDEN ELECTRONICS CO106 citations93

US4281222AJul 28, 1981

Miniaturized unidirectional electret microphone

HOSIDEN ELECTRONICS CO76 citations93

US4268725AMay 19, 1981

Electret microphone

HOSIDEN ELECTRONICS CO35 citations89

US4236051ANov 25, 1980

Electret microphone

HOSIDEN ELECTRONICS CO14 citations68