Assignee
DAVID SYSTEMS INC
US·6 granted patents·252 citations·filing 1984–1989
Top patents by PatentIndex Score
6 records- 0194US4584690AAlternate Mark Invert (AMI) transceiver with switchable detection and digital precompensationDAVID SYSTEMS INC·Filed 1984·Granted Apr 22, 1986·144 cites·8 claims
- 0276US4579406APrinted circuit board connector systemDAVID SYSTEMS INC·Filed 1985·Granted Apr 1, 1986·36 cites·7 claims
- 0366US4975903ADigital timeslot and signaling bus in a digital PBX switchDAVID SYSTEMS INC·Filed 1989·Granted Dec 4, 1990·30 cites·28 claims
- 0466US4680779ADistributed clock synchronization in a digital data switching systemDAVID SYSTEMS INC·Filed 1985·Granted Jul 14, 1987·30 cites·14 claims
- 0546US4731827AInterswitch line circuitDAVID SYSTEMS INC·Filed 1984·Granted Mar 15, 1988·6 cites·8 claims
- 0641US4689816AThree relay C. O. trunk interfaceDAVID SYSTEMS INC·Filed 1985·Granted Aug 25, 1987·6 cites·10 claims
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