Inventor
SATO YASUJI
JP15 patents
⚠️ This page may combine multiple inventors who share the name “SATO YASUJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TOSHIBA KK
10 patentsUS5048091ASep 10, 1991
Talker speech level control circuit for telephone transmitter by piezoelectric conversion
TOSHIBA KK22 citations92
US4645882AFeb 24, 1987
Latching relay drive circuit for use in telephone sets
TOSHIBA KK42 citations92
US4893331AJan 9, 1990
System allowing selective connection of various types of external apparatuses to telephone set
TOSHIBA KK24 citations91
US4764954AAug 16, 1988
Automatic gain control in a loudspeaker telephone set
TOSHIBA KK21 citations82
US4636588AJan 13, 1987
Electric source circuit for telephone sets
TOSHIBA KK15 citations73
US4564724AJan 14, 1986
Terminal interface connecting terminal unit having central office line interface to key telephone system
TOSHIBA KK11 citations73
US4815127AMar 21, 1989
Communication system using unbalanced communication paths
TOSHIBA KK7 citations69
US4996710AFeb 26, 1991
Side-tone adjusting system and method for key telephone system establishing a plurel kinds of speaking paths
TOSHIBA KK5 citations63
US4932043AJun 5, 1990
Apparatus for controlling key telephone station set in key telephone system
TOSHIBA KK3 citations62
US4856058AAug 8, 1989
Office line interface circuits
TOSHIBA KK6 citations58
TOKYO SHIBAURA ELECTRIC CO
5 patentsUS4532378AJul 30, 1985
Telephone apparatus capable of inputting character data
TOKYO SHIBAURA ELECTRIC CO55 citations91
US4511764AApr 16, 1985
Telephonic display device
TOKYO SHIBAURA ELECTRIC CO43 citations91
US4567326AJan 28, 1986
Telephone apparatus for selective operation in a normal and repertory dial mode
TOKYO SHIBAURA ELECTRIC CO9 citations73
US4491693AJan 1, 1985
Key telephone system and method of setting operating data in the key telephone system
TOKYO SHIBAURA ELECTRIC CO14 citations73
US4184054AJan 15, 1980
Key telephone system
TOKYO SHIBAURA ELECTRIC CO9 citations70