Assignee
FEDERAL SIGNAL CORP
US·49 granted patents·2,621 citations·filing 1976–1998
Top patents by PatentIndex Score
49 records- 0197US4319306AElectrically synchronized rotating light systemFEDERAL SIGNAL CORP·Filed 1980·Granted Mar 9, 1982·138 cites·10 claims
- 0296US5426417AOscillating warning light for emergency vehicleFEDERAL SIGNAL CORP·Filed 1993·Granted Jun 20, 1995·117 cites·15 claims
- 0396US5097397ANon-linear signalling device for vehiclesFEDERAL SIGNAL CORP·Filed 1990·Granted Mar 17, 1992·186 cites·44 claims
- 0494US5422623AProgrammable emergency signalling device and systemFEDERAL SIGNAL CORP·Filed 1993·Granted Jun 6, 1995·148 cites·43 claims
- 0593US5884997ALight barFEDERAL SIGNAL CORP·Filed 1996·Granted Mar 23, 1999·200 cites·36 claims
- 0693US4595904AWarning light system for emergency vehiclesFEDERAL SIGNAL CORP·Filed 1983·Granted Jun 17, 1986·102 cites·19 claims
- 0792US5557257AProgrammable emergency signalling system for a vehicleFEDERAL SIGNAL CORP·Filed 1993·Granted Sep 17, 1996·117 cites·14 claims
- 0892US5296840AProgrammable emergency signalling system for a vehicleFEDERAL SIGNAL CORP·Filed 1990·Granted Mar 22, 1994·175 cites·34 claims
- 0991US4189709AModular housing assembly for vehicle warning light systemFEDERAL SIGNAL CORP·Filed 1978·Granted Feb 19, 1980·57 cites·14 claims
- 1090US5644291AOverlapping strobe flash patternFEDERAL SIGNAL CORP·Filed 1995·Granted Jul 1, 1997·110 cites·19 claims
- 1189US5572201AAlerting device and system for abnormal situationsFEDERAL SIGNAL CORP·Filed 1994·Granted Nov 5, 1996·297 cites·30 claims
- 1288US6100791AProgrammable emergency signalling device and systemFEDERAL SIGNAL CORP·Filed 1994·Granted Aug 8, 2000·64 cites·12 claims
- 1387US4480211AFlash lamp and circuitry for use with an incandescent lightFEDERAL SIGNAL CORP·Filed 1983·Granted Oct 30, 1984·59 cites·4 claims
- 1484US6056426AMonolithic beam shaping light output light deviceFEDERAL SIGNAL CORP·Filed 1998·Granted May 2, 2000·69 cites·26 claims
- 1584US4488209APortable lighting apparatusFEDERAL SIGNAL CORP·Filed 1983·Granted Dec 11, 1984·38 cites·10 claims
- 1684US4357595AFlashing light warning system for vehiclesFEDERAL SIGNAL CORP·Filed 1980·Granted Nov 2, 1982·38 cites·8 claims
- 1783US5584560ARemote control spotlightFEDERAL SIGNAL CORP·Filed 1995·Granted Dec 17, 1996·56 cites·33 claims
- 1882US4613797AFlash strobe power supplyFEDERAL SIGNAL CORP·Filed 1984·Granted Sep 23, 1986·45 cites·20 claims
- 1981US4334211ASpeaker grille for streamlined light bar mounted on vehicle roofFEDERAL SIGNAL CORP·Filed 1980·Granted Jun 8, 1982·65 cites·8 claims
- 2080USRE36245ENon-linear signalling device for vehiclesFEDERAL SIGNAL CORP·Filed 1994·Granted Jul 6, 1999·34 cites·44 claims
- 2176US5146508AOmindirectional modular sirenFEDERAL SIGNAL CORP·Filed 1990·Granted Sep 8, 1992·49 cites·15 claims
- 2276US4108560ASign mounting fastenerFEDERAL SIGNAL CORP·Filed 1977·Granted Aug 22, 1978·33 cites·7 claims
- 2373US4387362AMethod and apparatus for increasing effective light intensity of a rotating lightFEDERAL SIGNAL CORP·Filed 1981·Granted Jun 7, 1983·25 cites·2 claims
- 2472US5970158ACompact horn speakerFEDERAL SIGNAL CORP·Filed 1997·Granted Oct 19, 1999·46 cites·6 claims
- 2572US4893343ADual diverging manifold loudspeaker systemFEDERAL SIGNAL CORP·Filed 1989·Granted Jan 9, 1990·33 cites·20 claims
- 2671US4635039ALow drag warning system for emergency vehiclesFEDERAL SIGNAL CORP·Filed 1983·Granted Jan 6, 1987·23 cites·8 claims
- 2771US4169308ASign mounting methodFEDERAL SIGNAL CORP·Filed 1978·Granted Oct 2, 1979·25 cites·7 claims
- 2870US5691696ASystem and method for broadcasting colored light for emergency signalsFEDERAL SIGNAL CORP·Filed 1995·Granted Nov 25, 1997·29 cites·22 claims
- 2970US4240062AFlashing light warning system for vehiclesFEDERAL SIGNAL CORP·Filed 1978·Granted Dec 16, 1980·15 cites·8 claims
- 3070US4100380ASupervisory circuit for monitoring speaker coilsFEDERAL SIGNAL CORP·Filed 1976·Granted Jul 11, 1978·18 cites·6 claims
- 3169US4633229AElectronic outdoor warning sirenFEDERAL SIGNAL CORP·Filed 1982·Granted Dec 30, 1986·30 cites·9 claims
- 3267US4847590AOutdoor warning sirenFEDERAL SIGNAL CORP·Filed 1988·Granted Jul 11, 1989·25 cites·31 claims
- 3362US4139957ALow energy sign illumination systemFEDERAL SIGNAL CORP·Filed 1977·Granted Feb 20, 1979·19 cites·10 claims
- 3461US5877681ASystem and method for broadcasting colored light for emergency signallingFEDERAL SIGNAL CORP·Filed 1997·Granted Mar 2, 1999·21 cites·44 claims
- 3559US4281311AMethod and apparatus for increasing effective light intensity of a rotating lightFEDERAL SIGNAL CORP·Filed 1979·Granted Jul 28, 1981·11 cites·1 claims
- 3653US5207496AWarning light with accessory mirrorFEDERAL SIGNAL CORP·Filed 1990·Granted May 4, 1993·15 cites·26 claims
- 3746US5754095ATone generating circuitFEDERAL SIGNAL CORP·Filed 1995·Granted May 19, 1998·13 cites·27 claims
- 3845US4918738AStructural assembly for housing an acoustical systemFEDERAL SIGNAL CORP·Filed 1988·Granted Apr 17, 1990·18 cites·14 claims
- 3945US4511880ATwin oscillating lightFEDERAL SIGNAL CORP·Filed 1982·Granted Apr 16, 1985·8 cites·10 claims
- 4044US5103215ADevice for signalling status of machines or processesFEDERAL SIGNAL CORP·Filed 1990·Granted Apr 7, 1992·16 cites·24 claims
- 4140US4529969ASirenFEDERAL SIGNAL CORP·Filed 1982·Granted Jul 16, 1985·6 cites·14 claims
- 4237US4057208ASlide cam assembly for railroad-crossing gate mechanismFEDERAL SIGNAL CORP·Filed 1976·Granted Nov 8, 1977·7 cites·4 claims
- 4336US4463282AFlash lampFEDERAL SIGNAL CORP·Filed 1982·Granted Jul 31, 1984·4 cites·6 claims
- 4436US4286254ARotating signal light with variable voltage lamp circuitFEDERAL SIGNAL CORP·Filed 1979·Granted Aug 25, 1981·3 cites·6 claims
- 4533US5577834ALight emitting deviceFEDERAL SIGNAL CORP·Filed 1994·Granted Nov 26, 1996·5 cites·29 claims
- 4627US5416677AWarning light socket assembly and method for installing sameFEDERAL SIGNAL CORP·Filed 1993·Granted May 16, 1995·2 cites·22 claims
- 4725US5815617AFiber optic cable connectorFEDERAL SIGNAL CORP·Filed 1996·Granted Sep 29, 1998·4 cites·36 claims
- 4822US4529059AVibrating diaphragm type audible device with acoustically improved grille and methodFEDERAL SIGNAL CORP·Filed 1982·Granted Jul 16, 1985·2 cites·10 claims
- 4921US4530037AFlash tube with moving reflectorsFEDERAL SIGNAL CORP·Filed 1983·Granted Jul 16, 1985·1 cites·10 claims
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