Inventor
TSURUSAKI MASAYUKI
JP14 patents
⚠️ This page may combine multiple inventors who share the name “TSURUSAKI MASAYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TOSHIBA KK
13 patentsUS6496576B2Dec 17, 2002
Digital key telephone system and extension terminal device thereof
TOSHIBA KK103 citations98
US4764954AAug 16, 1988
Automatic gain control in a loudspeaker telephone set
TOSHIBA KK21 citations82
US6633631B2Oct 14, 2003
Digital key telephone system and extension terminal device thereof
TOSHIBA KK4 citations73
US5040172AAug 13, 1991
Communication method utilizing channel highway and digital communication apparatus for realizing the same
TOSHIBA KK11 citations73
US5105461AApr 14, 1992
Telephone line interface circuit
TOSHIBA KK11 citations72
US6456705B1Sep 24, 2002
Digital key telephone system and extension terminal device thereof
TOSHIBA KK3 citations62
US6408060B2Jun 18, 2002
Digital key telephone system and extension terminal device thereof
TOSHIBA KK2 citations62
US6373924B2Apr 16, 2002
Digital key telephone system and extension terminal device thereof
TOSHIBA KK3 citations62
US4887264ADec 12, 1989
Digital key telephone system
TOSHIBA KK3 citations62
US4852158AJul 25, 1989
Telephone system allowing hold releasing request from central office line
TOSHIBA KK2 citations60
US5335270AAug 2, 1994
Bell signal generating circuit
TOSHIBA KK0 citations52
US6377671B2Apr 23, 2002
Digital key telephone system and extension terminal device thereof
TOSHIBA KK0 citations51
US5033081AJul 16, 1991
Key telephone system
TOSHIBA KK1 citations51