Assignee
PILKINGTON PERKIN ELMER LTD
GB·72 granted patents·3,287 citations·filing 1975–1999
Top patents by PatentIndex Score
72 records- 0199US4637697AMultifocal contact lenses utilizing diffraction and refractionPILKINGTON PERKIN ELMER LTD·Filed 1983·Granted Jan 20, 1987·472 cites·22 claims
- 0296US4642112AArtificial eye lensesPILKINGTON PERKIN ELMER LTD·Filed 1982·Granted Feb 10, 1987·318 cites·24 claims
- 0395US4641934AOphthalmic lens with diffractive powerPILKINGTON PERKIN ELMER LTD·Filed 1983·Granted Feb 10, 1987·300 cites·18 claims
- 0495US4322135AOptical apparatusPILKINGTON PERKIN ELMER LTD·Filed 1979·Granted Mar 30, 1982·84 cites·22 claims
- 0594US4398799AHead-up displaysPILKINGTON PERKIN ELMER LTD·Filed 1981·Granted Aug 16, 1983·104 cites·10 claims
- 0693US4232943AModified Petzval lensPILKINGTON PERKIN ELMER LTD·Filed 1978·Granted Nov 11, 1980·143 cites·23 claims
- 0792US4772942ADisplay system having wide field of viewPILKINGTON PERKIN ELMER LTD·Filed 1987·Granted Sep 20, 1988·299 cites·8 claims
- 0892US4200366AMicroform readersPILKINGTON PERKIN ELMER LTD·Filed 1977·Granted Apr 29, 1980·21 cites·18 claims
- 0991US4655565AOphthalmic lenses with diffractive powerPILKINGTON PERKIN ELMER LTD·Filed 1985·Granted Apr 7, 1987·239 cites·17 claims
- 1089US4153913AHead-up displaysPILKINGTON PERKIN ELMER LTD·Filed 1977·Granted May 8, 1979·62 cites·19 claims
- 1186US4679891AInfra-red lensesPILKINGTON PERKIN ELMER LTD·Filed 1985·Granted Jul 14, 1987·59 cites·13 claims
- 1285US4457461AHead mounting apparatusPILKINGTON PERKIN ELMER LTD·Filed 1982·Granted Jul 3, 1984·63 cites·17 claims
- 1385US4399430AIntruder detection security systemPILKINGTON PERKIN ELMER LTD·Filed 1981·Granted Aug 16, 1983·70 cites·22 claims
- 1482US4538527ASecurity systemPILKINGTON PERKIN ELMER LTD·Filed 1982·Granted Sep 3, 1985·59 cites·18 claims
- 1581US4261635AOptical apparatusPILKINGTON PERKIN ELMER LTD·Filed 1979·Granted Apr 14, 1981·35 cites·5 claims
- 1678US4714307ACatadioptric infrared lensesPILKINGTON PERKIN ELMER LTD·Filed 1986·Granted Dec 22, 1987·39 cites·16 claims
- 1776US4030805AInfra-red lensesPILKINGTON PERKIN ELMER LTD·Filed 1975·Granted Jun 21, 1977·28 cites·24 claims
- 1875US4934771AOptical apparatusPILKINGTON PERKIN ELMER LTD·Filed 1986·Granted Jun 19, 1990·34 cites·14 claims
- 1974US4619863ASolar cell assemblyPILKINGTON PERKIN ELMER LTD·Filed 1984·Granted Oct 28, 1986·48 cites·5 claims
- 2073US4671603AOptical filters and multiplexing-demultiplexing devices using the samePILKINGTON PERKIN ELMER LTD·Filed 1984·Granted Jun 9, 1987·38 cites·13 claims
- 2172US5684634AHead-up displaysPILKINGTON PERKIN ELMER LTD·Filed 1994·Granted Nov 4, 1997·37 cites·11 claims
- 2271US5396349ALateral and longitudinal chromatic dispersion correction in display systems employing non-conformal reflection hologramsPILKINGTON PERKIN ELMER LTD·Filed 1992·Granted Mar 7, 1995·39 cites·5 claims
- 2371US4199217AInfra-red optical systemsPILKINGTON PERKIN ELMER LTD·Filed 1978·Granted Apr 22, 1980·22 cites·18 claims
- 2470US6424460B1Dual field-of-view objects system for the infraredPILKINGTON PERKIN ELMER LTD·Filed 1999·Granted Jul 23, 2002·42 cites·6 claims
- 2570US4582394ADisplay apparatusPILKINGTON PERKIN ELMER LTD·Filed 1983·Granted Apr 15, 1986·19 cites·10 claims
- 2670US4376889ALow light level vision apparatusPILKINGTON PERKIN ELMER LTD·Filed 1980·Granted Mar 15, 1983·26 cites·28 claims
- 2770US4178075ALenses with distortionPILKINGTON PERKIN ELMER LTD·Filed 1978·Granted Dec 11, 1979·16 cites·20 claims
- 2868US6118583AOptical imaging systemPILKINGTON PERKIN ELMER LTD·Filed 1998·Granted Sep 12, 2000·30 cites·6 claims
- 2968US4329024AObjective lensesPILKINGTON PERKIN ELMER LTD·Filed 1978·Granted May 11, 1982·20 cites·16 claims
- 3067US4392710AOptical apparatusPILKINGTON PERKIN ELMER LTD·Filed 1980·Granted Jul 12, 1983·20 cites·32 claims
- 3166US5479273AHologram constructionPILKINGTON PERKIN ELMER LTD·Filed 1993·Granted Dec 26, 1995·24 cites·9 claims
- 3264US4148548ATemperature compensating focusing in infrared zoom lensesPILKINGTON PERKIN ELMER LTD·Filed 1977·Granted Apr 10, 1979·20 cites·13 claims
- 3363US5249081AOptical apparatus for superimposing displayed visual informationPILKINGTON PERKIN ELMER LTD·Filed 1991·Granted Sep 28, 1993·25 cites·18 claims
- 3463US4832448AInterference filterPILKINGTON PERKIN ELMER LTD·Filed 1987·Granted May 23, 1989·21 cites·17 claims
- 3560US4688902AAnti-backlash camPILKINGTON PERKIN ELMER LTD·Filed 1985·Granted Aug 25, 1987·17 cites·12 claims
- 3659US4630903AEyeguardsPILKINGTON PERKIN ELMER LTD·Filed 1984·Granted Dec 23, 1986·24 cites·12 claims
- 3758US4676581AInfra-red lensesPILKINGTON PERKIN ELMER LTD·Filed 1986·Granted Jun 30, 1987·19 cites·21 claims
- 3858US4432596AInfra-red optical systemsPILKINGTON PERKIN ELMER LTD·Filed 1981·Granted Feb 21, 1984·19 cites·24 claims
- 3955US4178072AOptical systemsPILKINGTON PERKIN ELMER LTD·Filed 1977·Granted Dec 11, 1979·13 cites·45 claims
- 4053US4850660AHigh emissivity article having multiple layers of a material of high internal stressPILKINGTON PERKIN ELMER LTD·Filed 1987·Granted Jul 25, 1989·17 cites·15 claims
- 4153US4600265AInfra-red optical systemsPILKINGTON PERKIN ELMER LTD·Filed 1984·Granted Jul 15, 1986·14 cites·19 claims
- 4253US4383727AInfra-red optical systemsPILKINGTON PERKIN ELMER LTD·Filed 1980·Granted May 17, 1983·12 cites·26 claims
- 4352US5793911AIllumination devicePILKINGTON PERKIN ELMER LTD·Filed 1995·Granted Aug 11, 1998·18 cites·9 claims
- 4452US4183626ALensesPILKINGTON PERKIN ELMER LTD·Filed 1977·Granted Jan 15, 1980·11 cites·30 claims
- 4551US5969860AOptical SystemPILKINGTON PERKIN ELMER LTD·Filed 1998·Granted Oct 19, 1999·25 cites·4 claims
- 4651US4834472AOptical beam expanders with materials chosen to effect athermalizationPILKINGTON PERKIN ELMER LTD·Filed 1987·Granted May 30, 1989·14 cites·13 claims
- 4751US4714309AReflection hologramsPILKINGTON PERKIN ELMER LTD·Filed 1985·Granted Dec 22, 1987·15 cites·17 claims
- 4851US4669811AOptical filtering apparatusPILKINGTON PERKIN ELMER LTD·Filed 1984·Granted Jun 2, 1987·18 cites·9 claims
- 4951US4183624ALensesPILKINGTON PERKIN ELMER LTD·Filed 1976·Granted Jan 15, 1980·11 cites·15 claims
- 5048US6160668AOptical systemsPILKINGTON PERKIN ELMER LTD·Filed 1999·Granted Dec 12, 2000·13 cites·6 claims
Showing the top 50 of 72 patent records by PatentIndex Score.
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