Assignee
ASTECH INC
US7 patents
Top patents by PatentIndex Score
US4475193AOct 2, 1984
Power line carrier multi telephone extension system for full duplex conferencing between telephones
ASTECH INC153 citations98
US4495386AJan 22, 1985
Telephone extension system utilizing power line carrier signals
ASTECH INC115 citations94
US4479033AOct 23, 1984
Telephone extension system utilizing power line carrier signals
ASTECH INC125 citations94
US4523307AJun 11, 1985
Power line carrier multi telephone extension system for full duplex conferencing and intercom between telephones
ASTECH INC127 citations93
US4514594AApr 30, 1985
Power line carrier telephone extension system for full duplex conferencing between telephones and having telephone call hold capability
ASTECH INC108 citations93
US4058678ANov 15, 1977
Remote signalling to a telephone line utilizing power line carrier signals
ASTECH INC107 citations93
US6007029ADec 28, 1999
Boiler tube alignment link system
ASTECH INC14 citations66