Assignee
TIE COMMUNICATIONS
US20 patents
Top patents by PatentIndex Score
US4740955AApr 26, 1988
Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones
TIE COMMUNICATIONS101 citations91
US4173714ANov 6, 1979
Communication circuit with combined power feed and data transmission over a phantom channel
TIE COMMUNICATIONS91 citations91
US4667142AMay 19, 1987
Three-way power source circuit
TIE COMMUNICATIONS35 citations90
US4203011AMay 13, 1980
Computer controlled key telephone station set
TIE COMMUNICATIONS32 citations88
US4577310AMar 18, 1986
Station interface for digital electronic telephone switching system having centralized digital audio processor
TIE COMMUNICATIONS38 citations87
US4338495AJul 6, 1982
Electronic key telephone systems
TIE COMMUNICATIONS21 citations77
USD307418SApr 24, 1990
Telephone base
TIE COMMUNICATIONS7 citations72
USD299460SJan 17, 1989
Telephone set
TIE COMMUNICATIONS6 citations72
USD299458SJan 17, 1989
Telephone set
TIE COMMUNICATIONS9 citations72
USD299459SJan 17, 1989
Telephone set
TIE COMMUNICATIONS11 citations72
US4341927AJul 27, 1982
Data transmission apparatus
TIE COMMUNICATIONS14 citations71
US4757521AJul 12, 1988
Synchronization method and apparatus for a telephone switching system
TIE COMMUNICATIONS14 citations68
US4715062ADec 22, 1987
Speakerphone control circuit having low gain states and method for controlling gain of speakerphone
TIE COMMUNICATIONS17 citations68
US4140877AFeb 20, 1979
Muliple highway time division multiplexed PABX communication system
TIE COMMUNICATIONS20 citations68
US4894860AJan 16, 1990
Trunk interface circuitry for telephone systems
TIE COMMUNICATIONS11 citations63
US5081329AJan 14, 1992
Key assembly, switch assembly and method of making same
TIE COMMUNICATIONS18 citations60
US4773068ASep 20, 1988
Dual channel transmission method and apparatus with inherent channel identification and extraction
TIE COMMUNICATIONS3 citations60
US4679228AJul 7, 1987
Speakerphone sensing circuit
TIE COMMUNICATIONS6 citations60
US4674118AJun 16, 1987
Telephone line hold and hold release apparatus
TIE COMMUNICATIONS5 citations60
US3963879AJun 15, 1976
Telephone dial assembly
TIE COMMUNICATIONS1 citations51