Assignee
CHESTEL INC
4 patents
Top patents by PatentIndex Score
US3937892AFeb 10, 1976
Electronic time-division-multiplexed pabx telephone system
CHESTEL INC26 citations75
US4087643AMay 2, 1978
Time division multiplexed PABX communication switching system
CHESTEL INC12 citations67
US4016370AApr 5, 1977
Digital tone decoder
CHESTEL INC14 citations65
US4086440AApr 25, 1978
Telephone set with loop current interruption timing control
CHESTEL INC7 citations57