Assignee
PLESSEY CO PLC
GB·26 granted patents·1,056 citations·filing 1980–1989
Top patents by PatentIndex Score
26 records- 0197US4826977APhotochromic spiropyran compoundsPLESSEY CO PLC·Filed 1987·Granted May 2, 1989·253 cites·11 claims
- 0295US4818096APhotoreactive lenses with adamantane spiro compoundsPLESSEY CO PLC·Filed 1987·Granted Apr 4, 1989·259 cites·12 claims
- 0394US4576766APhotochromic compounds and their use in photoreactive lensesPLESSEY CO PLC·Filed 1983·Granted Mar 18, 1986·82 cites·8 claims
- 0493US4685783APolychromic tetracyclo-spiro-adamatylidene derivatives, and polychromic lens incorporating said compoundsPLESSEY CO PLC·Filed 1984·Granted Aug 11, 1987·107 cites·7 claims
- 0593US4425640ATelecommunications switching network using digital switching modulesPLESSEY CO PLC·Filed 1981·Granted Jan 10, 1984·118 cites·10 claims
- 0679US4387456AAlarm monitoring arrangements for digital telecommunications switching networksPLESSEY CO PLC·Filed 1980·Granted Jun 7, 1983·52 cites·3 claims
- 0773US4838634AOrganic optical waveguides and method of fabricating waveguide structuresPLESSEY CO PLC·Filed 1987·Granted Jun 13, 1989·34 cites·19 claims
- 0867US4737449APhotochromic 3-pyrryl fulgides and fulgimidesPLESSEY CO PLC·Filed 1986·Granted Apr 12, 1988·8 cites·11 claims
- 0961US4535442ADigital switching network for telecommunications exchangePLESSEY CO PLC·Filed 1983·Granted Aug 13, 1985·13 cites·9 claims
- 1056US4393490ADigital telecommunications switches network with in-built fault identificationPLESSEY CO PLC·Filed 1980·Granted Jul 12, 1983·13 cites·3 claims
- 1155US4990287AOptical devices utilizing photochromic compoundsPLESSEY CO PLC·Filed 1987·Granted Feb 5, 1991·19 cites·14 claims
- 1252US4794644AMethod of secured communications in a telecommunications systemPLESSEY CO PLC·Filed 1986·Granted Dec 27, 1988·18 cites·4 claims
- 1349US4365330AChannel zero switching arrangements for digital telecommunication exchangesPLESSEY CO PLC·Filed 1980·Granted Dec 21, 1982·8 cites·5 claims
- 1448US4888603ALight emitting diode arrayPLESSEY CO PLC·Filed 1988·Granted Dec 19, 1989·12 cites·5 claims
- 1547US4617659AFrame aligner for use in telecommunications systemsPLESSEY CO PLC·Filed 1984·Granted Oct 14, 1986·10 cites·4 claims
- 1644US4648090AArrangement for controlling switched speech or data communication in a communications exchangePLESSEY CO PLC·Filed 1985·Granted Mar 3, 1987·9 cites·3 claims
- 1744US4587649AMethod of growth of a digital switchblockPLESSEY CO PLC·Filed 1985·Granted May 6, 1986·9 cites·5 claims
- 1843US4912700ATelecommunications digital switchPLESSEY CO PLC·Filed 1988·Granted Mar 27, 1990·8 cites·8 claims
- 1939US4425641ATime division multiplex telecommunication digital switching modulesPLESSEY CO PLC·Filed 1981·Granted Jan 10, 1984·5 cites·10 claims
- 2037US4530089ATelecommunications digital switchblock utilizing control switch state mapsPLESSEY CO PLC·Filed 1983·Granted Jul 16, 1985·4 cites·6 claims
- 2131US4861899APhotochromic gamma butyrolactonesPLESSEY CO PLC·Filed 1987·Granted Aug 29, 1989·0 cites·4 claims
- 2230US4984236ACircuit arrangement for use in the time division multiplexed signalling systemPLESSEY CO PLC·Filed 1989·Granted Jan 8, 1991·4 cites·3 claims
- 2329US4905223AWideband/multislot switching arrangementPLESSEY CO PLC·Filed 1988·Granted Feb 27, 1990·1 cites·5 claims
- 2429US4864556ASynchronization arrangements for a digital telecommunications exchange systemPLESSEY CO PLC·Filed 1988·Granted Sep 5, 1989·1 cites·6 claims
- 2529US4858223ASecurity arrangement for a telecommunications exchange systemPLESSEY CO PLC·Filed 1988·Granted Aug 15, 1989·4 cites·6 claims
- 2619US4573485ACoin runway with coin sequencing facilityPLESSEY CO PLC·Filed 1983·Granted Mar 4, 1986·5 cites·7 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →