Inventor
MURAKAMI FUMIKAZU
JP13 patents
Patents
13 patentsUS4520237AMay 28, 1985
Electrodynamic speaker
SEIKO INSTR & ELECTRONICS38 citations91
US4023162AMay 10, 1977
Electronic buzzer
SEIKO INSTR & ELECTRONICS7 citations72
US4197697AApr 15, 1980
Alarm watch
SEIKO INSTR & ELECTRONICS11 citations71
US4090041AMay 16, 1978
Electromagnetic sonic generator for an alarm
SEIKO INSTR & ELECTRONICS18 citations71
US4216650AAug 12, 1980
Alarm wristwatch
SEIKO INSTR & ELECTRONICS12 citations70
US4159472AJun 26, 1979
Electronic buzzer
SEIKO INSTR & ELECTRONICS8 citations70
US4147899AApr 3, 1979
Broadband electromagnetic sound source with differently tuned diaphragms
SEIKO INSTR & ELECTRONICS9 citations70
US4445113AApr 24, 1984
Small type acoustic device
SEIKO INSTR & ELECTRONICS4 citations62
US4389123AJun 21, 1983
Electronic alarm watch
SEIKO INSTR & ELECTRONICS3 citations62
US4526477AJul 2, 1985
Piezoelectric buzzer for wrist watches
SEIKO INSTR & ELECTRONICS3 citations61
US4205517AJun 3, 1980
Alarm electronic timepiece
SEIKO INSTR & ELECTRONICS3 citations60
US4386244AMay 31, 1983
Electromagnetic transducer
SEIKO INSTR & ELECTRONICS3 citations53
US4358642ANov 9, 1982
Electro-magnetic type electric acoustic transducer
SEIKO INSTR & ELECTRONICS1 citations51