Patent US4532455A successfully refreshed from Google Patents.
US4532455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten halogen incandescent lamps containing mixed halogens
Assignee: EMI Group Ltd
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Filing: 1982-06-21
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Granted: 1985-07-30
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Expires: 2002-06-21
Abstract
Abstract The invention provides a tungsten halogen linear incandescent lamp having a gas fill comprising a mixture of CHI 3 and (PNBr 2 ) 3 . Gas fills according to the invention comprise from 6 to 32 micrograms of (PNBr 2 ) 3 per c.c. of the lamp internal volume with a ratio of CHI 3 to (PNBr 2 ) 3 of from 1:1 to 5:1 and result in lamps having a increased efficacy and a life of more than 2,000 hours.
Inventors
- 👤 Ian Connor
- 👤 Paul V. Crawshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:54
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A tungsten halogen cycle electric incandescent lamp comprising an envelope of light transmitting refractory material, a filament within said envelope, means supporting the filament within the envelope and electric leads to the filament, said lamp further including a non reactive gas filling together with a further fill comprising a mixture of bromophosphonitrile and iodoform wherein said further fill comprises from 6 to 32 micrograms of bromophosphonitrile per cc of the internal volume of the lamp envelope and wherein the ratio of the iodoform to the bromophosphonitrile is from 1:1 to 5:1 by weight.
Claim 2
Dependent Claim
93 words
A tungsten halogen cycle electric incandescent lamp comprising an envelope of light transmitting refractory material, a filament within said envelope, means supporting the filament within the envelope and electric leads to the filament, said lamp further including a non reactive gas filling together with a further fill comprising a mixture of bromophosphonitrile and iodoform wherein said further fill comprises from 6 to 32 micrograms of bromophosphonitrile per cc of the internal volume of the lamp envelope and wherein the ratio of the iodoform to the bromophosphonitrile is from 1:1 to 5:1 by weight.
Claim 3
Dependent Claim
25 words
A lamp according to claim 1 containing 12.5 micrograms of bromophosphonitrile per c.c. and wherein the ratio of iodoform to bromophosphonitrile is 2:1 by weight.
Claim 4
Dependent Claim
23 words
A a tungsten halogen linear incandescent lamp according to claim 1 wherein the lead and support wires are generally parallel to the filament.
Claim 5
Dependent Claim
18 words
A lamp according to claim 1 wherein the lead and support wires are generally transverse to the filament.
Claim 6
Dependent Claim
19 words
A tungsten halogen cycle electric incadescent lamp according to claim 1 wherein the non reactive gas filling includes nitrogen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |