US3644773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A hydrogen-halogen filament lamp with a hydrogen getter flag
Assignee: Thorn Lighting Ltd
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Filing: 1970-04-24
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Granted: 1972-02-22
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Expires: 1990-04-24
Abstract
Abstract Alkyl iodides and other hydrogen and halogen containing compounds are employed in the fill of tungsten-halogen cycle electric incandescent lamps, means being provided in the lamp envelope for combining with hydrogen to reduce the hydrogen content of the reactive system of the fill whereby recombination of the hydrogen and halogen can be minimized, thus providing a maximum content of halogen in the fill for supporting the regenerative tungsten-halogen cycle. Where an alkyl iodide constitutes the hydrogen and halogen containing component of the fill the hydrogen-combining means may be dispensed with.
Inventors
- 👤 James Richard Coaton
- 👤 John Michael Rees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:15
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; H01K1/52; H01K1/54; H01K1/56; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A lamp according to claim 1 wherein said first material comprises a metal selected from the group consisting of Ti, Ta, Zr, Al and alloys thereof, and said second material comprises a metal selected from the group consisting of Pd and a Pd-Ni alloy.
Claim 2
Dependent Claim
16 words
A lamp according claim 1 wherein said hydrogen and halogen containing compound is an alkyl halide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |