Assignee
DURO TEST CORP
US·45 granted patents·894 citations·filing 1974–1998
Top patents by PatentIndex Score
45 records- 0196US4758173ASocket adaptor for fluorescent lampDURO TEST CORP·Filed 1986·Granted Jul 19, 1988·131 cites·15 claims
- 0292US3988633AFluorescent lamp with envelope groovesDURO TEST CORP·Filed 1975·Granted Oct 26, 1976·45 cites·10 claims
- 0391US4924368AFluorescent lamp with protective shieldDURO TEST CORP·Filed 1989·Granted May 8, 1990·79 cites·16 claims
- 0491US4160929AIncandescent light source with transparent heat mirrorDURO TEST CORP·Filed 1977·Granted Jul 10, 1979·62 cites·33 claims
- 0590US4254363AElectrodeless coupled discharge lamp having reduced spurious electromagnetic radiationDURO TEST CORP·Filed 1978·Granted Mar 3, 1981·30 cites·31 claims
- 0688US4891550APhosphor blend for broad spectrum fluorescent lampDURO TEST CORP·Filed 1989·Granted Jan 2, 1990·48 cites·17 claims
- 0781US4366407AIncandescent lamp with selective color filterDURO TEST CORP·Filed 1980·Granted Dec 28, 1982·33 cites·20 claims
- 0881US4256989AIncandescent lamp with filament mounting means and socket adaptorDURO TEST CORP·Filed 1978·Granted Mar 17, 1981·33 cites·19 claims
- 0980US4143301AHigh intensity discharge lamp with integral means for arc extinguishingDURO TEST CORP·Filed 1976·Granted Mar 6, 1979·18 cites·18 claims
- 1079US4792716AEnergy-efficient electric discharge lamp with reflective coatingDURO TEST CORP·Filed 1981·Granted Dec 20, 1988·20 cites·10 claims
- 1179US4745323ACompact fluorescent lamp with outer envelopeDURO TEST CORP·Filed 1986·Granted May 17, 1988·25 cites·8 claims
- 1278US4032813AFluorescent lamp with reduced wattage consumption having electrode shield with getter materialDURO TEST CORP·Filed 1975·Granted Jun 28, 1977·18 cites·7 claims
- 1373US4227113AIncandescent electric lamp with partial light transmitting coatingDURO TEST CORP·Filed 1978·Granted Oct 7, 1980·20 cites·15 claims
- 1472US6072284AThree-way compact fluorescent lamp ballast and lamp holder incorporating sameDURO TEST CORP·Filed 1998·Granted Jun 6, 2000·35 cites·19 claims
- 1566US4752718AHigh intensity discharge lamp with integral means for arc extinguishingDURO TEST CORP·Filed 1978·Granted Jun 21, 1988·12 cites·4 claims
- 1665US5122710ARare earth phosphor blends for fluorescent lamp using four to five phosphorsDURO TEST CORP·Filed 1989·Granted Jun 16, 1992·20 cites·12 claims
- 1765US4707632AEnergy-efficient lampDURO TEST CORP·Filed 1986·Granted Nov 17, 1987·13 cites·25 claims
- 1864US4295873AMethod and apparatus for reworking a hollow workpieceDURO TEST CORP·Filed 1979·Granted Oct 20, 1981·15 cites·27 claims
- 1964US4208614AHigh intensity discharge lamp with integral means for arc extinguishingDURO TEST CORP·Filed 1978·Granted Jun 17, 1980·11 cites·5 claims
- 2062USD262828SElectric lampDURO TEST CORP·Filed 1979·Granted Jan 26, 1982·9 cites·1 claims
- 2162US4211958APhantom fluorescent lamp with safety switchDURO TEST CORP·Filed 1977·Granted Jul 8, 1980·21 cites·16 claims
- 2257US4645290ASelective color filterDURO TEST CORP·Filed 1984·Granted Feb 24, 1987·14 cites·26 claims
- 2357US4461973AEnergy-efficient incandescent lamp with improved filament characteristicsDURO TEST CORP·Filed 1982·Granted Jul 24, 1984·16 cites·7 claims
- 2456US4591752AIncandescent lamp with high pressure rare gas filled tungsten-halogen element and transparent thick walled safety envelopeDURO TEST CORP·Filed 1983·Granted May 27, 1986·19 cites·19 claims
- 2556US4275327AIncandescent electric lamp withheat recovery meansDURO TEST CORP·Filed 1978·Granted Jun 23, 1981·10 cites·21 claims
- 2656US4156830AHigh intensity discharge lamp with integral means for arc extinguishingDURO TEST CORP·Filed 1975·Granted May 29, 1979·7 cites·17 claims
- 2755US4409512AIncandescent electric lamp with etalon type transparent heat mirrorDURO TEST CORP·Filed 1981·Granted Oct 11, 1983·12 cites·14 claims
- 2854US4703220AIncandescent lamp with extended filament lifetimeDURO TEST CORP·Filed 1982·Granted Oct 27, 1987·11 cites·20 claims
- 2952US4728848AEnergy-efficient incandescent reflector lampDURO TEST CORP·Filed 1981·Granted Mar 1, 1988·10 cites·21 claims
- 3051US4816714ACorner cube array for use in incandescent lampsDURO TEST CORP·Filed 1987·Granted Mar 28, 1989·14 cites·14 claims
- 3150US4375605AEllipsoidal envelope for incandescent lamp with infrared energy return meansDURO TEST CORP·Filed 1981·Granted Mar 1, 1983·10 cites·9 claims
- 3250US4032814AFluorescent lamp with reduced wattage consumptionDURO TEST CORP·Filed 1975·Granted Jun 28, 1977·6 cites·5 claims
- 3350US3992201AFilaments for fluorescent lampsDURO TEST CORP·Filed 1974·Granted Nov 16, 1976·8 cites·9 claims
- 3449US4734616AFluoresent lamp with double cathode and probeDURO TEST CORP·Filed 1986·Granted Mar 29, 1988·7 cites·13 claims
- 3548US4090105AHigh intensity discharge lamp with multiple filament to extinguish lamp when outer envelope breaksDURO TEST CORP·Filed 1976·Granted May 16, 1978·6 cites·11 claims
- 3646US5498924AFluorescent lamp capable of operating on multiple ballast systemDURO TEST CORP·Filed 1995·Granted Mar 12, 1996·7 cites·17 claims
- 3744US4280076AIncandescent lamp with structure for collecting evaporated filament materialDURO TEST CORP·Filed 1978·Granted Jul 21, 1981·6 cites·23 claims
- 3843US4283653AHigh emissivity filament for energy conserving incandescent lamps with infrared radiation returning envelopesDURO TEST CORP·Filed 1979·Granted Aug 11, 1981·10 cites·12 claims
- 3941US4379249AIncandescent lamp with ellipsoidal envelope and infrared reflectorDURO TEST CORP·Filed 1980·Granted Apr 5, 1983·6 cites·12 claims
- 4041US4249101AIncandescent lamp with infrared reflecting-visible energy transmitting coating and misaligned filamentDURO TEST CORP·Filed 1978·Granted Feb 3, 1981·5 cites·11 claims
- 4140US4217522AMechanical safety switch for high intensity discharge lampsDURO TEST CORP·Filed 1978·Granted Aug 12, 1980·4 cites·12 claims
- 4238US4461969AIncandescent electric lamp with means for reducing effects of deposition of filament materialDURO TEST CORP·Filed 1981·Granted Jul 24, 1984·5 cites·19 claims
- 4327US4714857AInfrared reflective lamp with envelope having straight sectionsDURO TEST CORP·Filed 1986·Granted Dec 22, 1987·1 cites·15 claims
- 4427US4649319AGas discharge lamp starterDURO TEST CORP·Filed 1984·Granted Mar 10, 1987·1 cites·3 claims
- 4526US4350722AHollow glass article with improved optical finishDURO TEST CORP·Filed 1981·Granted Sep 21, 1982·1 cites·4 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →