Inventor
UMEDA KENKICHI
8 patents
Patents
8 patentsUS4167692ASep 11, 1979
Brush-less DC motor
SONY CORP71 citations96
US4041453AAug 9, 1977
Signal handling system for minimizing dropout effect
SONY CORP26 citations81
US4038692AJul 26, 1977
Tape sensing device for magnetic tape recording and/or reproducing apparatus
SONY CORP31 citations81
US3940799AFeb 24, 1976
Tape cassette with erasure prevention recesses at rear corners
SONY CORP16 citations73
US4139875AFeb 13, 1979
Cassette and card recording and/or reproducing apparatus
SONY CORP12 citations71
US4445150AApr 24, 1984
Recording in a single track visual signals associated with audio signals recorded in opposed directions in plural tracks
SONY CORP11 citations68
US4079426AMar 14, 1978
Tape speed switching multiple track tape recorder
SONY CORP5 citations58
US4005480AJan 25, 1977
Tape cassette and machine
SONY CORP1 citations51