Inventor
KUMADA AKIO
20 patents
⚠️ This page may combine multiple inventors who share the name “KUMADA AKIO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
14 patentsUS4352961AOct 5, 1982
Transparent flat panel piezoelectric speaker
HITACHI LTD150 citations97
US4367426AJan 4, 1983
Ceramic transparent piezoelectric transducer
HITACHI LTD54 citations93
US4471258ASep 11, 1984
Piezoelectric ceramic transducer
HITACHI LTD26 citations82
US4478217AOct 23, 1984
Laser surgical apparatus
HITACHI LTD26 citations79
US4154505AMay 15, 1979
Electro-optical light shutter device
HITACHI LTD19 citations74
US4496247AJan 29, 1985
Display device with transparent cover as a vibrator of a sound generator
HITACHI LTD7 citations73
US3990057ANov 2, 1976
Ferroelectric analog memory device and method of operating the same
HITACHI LTD13 citations73
US4392747AJul 12, 1983
Display device structure
HITACHI LTD11 citations72
US3973247AAug 3, 1976
Method of writing and erasing information for electrooptic ceramic memories
HITACHI LTD5 citations63
US4071841AJan 31, 1978
Dielectric matrix device
HITACHI LTD6 citations62
US3953109AApr 27, 1976
Domain switching element
HITACHI LTD6 citations62
US4088391AMay 9, 1978
Irregular ferroelectric element devised for single domain-wall motion
HITACHI LTD4 citations61
US4046455ASep 6, 1977
Irregular ferroelectric element devised for motion of plural domain-walls
HITACHI LTD5 citations61
US3936146AFeb 3, 1976
Irregular ferroelectric element for controllable single domain
HITACHI LTD5 citations61
HITACHI MAXELL
5 patentsUS4663556AMay 5, 1987
Torsional mode ultrasonic vibrator
HITACHI MAXELL69 citations96
US4947076AAug 7, 1990
Piezo electric motor
HITACHI MAXELL29 citations92
US4868446ASep 19, 1989
Piezoelectric revolving resonator and ultrasonic motor
HITACHI MAXELL41 citations92
US4642509AFeb 10, 1987
Ultrasonic motor using bending, longitudinal and torsional vibrations
HITACHI MAXELL47 citations92
US5008581AApr 16, 1991
Piezoelectric revolving resonator and single-phase ultrasonic motor
HITACHI MAXELL30 citations89