Patent US5348516A successfully refreshed from Google Patents.
Patent US4099081A successfully refreshed from Google Patents.
US4099081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamps and their production
Assignee: EMI Group Ltd
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Filing: 1977-02-24
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Granted: 1978-07-04
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Expires: 1997-02-24
Abstract
Abstract The invention relates to the production of metal halide discharge lamps. Residual water vapor within the envelope of metal halide discharge lamps is gettered by the inclusion of a small quantity of phosphorus. By this means it is possible to dispense with complexities in the conventional manufacture of such discharge lamps arising from the hygroscopic nature of many metal halides.
Inventors
- 👤 Thomas Somner Ainsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:43
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/24; H01J61/26; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
An electrical discharge lamp comprising a lamp envelope, electrodes and leads therefor and a vapour fill including metal halide and a quantity of phosphorus in the form of a metal phosphide sufficient to effectively getter water vapour inside the envelope but insufficient to affect the luminous efficacy of light from said lamp.
Claim 2
Dependent Claim
52 words
An electrical discharge lamp comprising a lamp envelope, electrodes and leads therefor and a vapour fill including metal halide and a quantity of phosphorus in the form of a metal phosphide sufficient to effectively getter water vapour inside the envelope but insufficient to affect the luminous efficacy of light from said lamp.
Claim 3
Dependent Claim
18 words
A lamp according to claim 1 wherein the quantity of phosphorus is less than 0.1 mg per c.c.
Claim 4
Dependent Claim
18 words
A lamp according to claim 1, wherein said metal phosphide comprises the same metal as said metal halide.
Claim 5
Dependent Claim
13 words
A lamp according to claim 1, wherein said metal phosphide is gallium phosphide.
Claim 6
Dependent Claim
19 words
A lamp according to claim 4 wherein the quantity of said phosphorus is less than 0.1 mg. per cc.
Claim 7
Dependent Claim
93 words
In the manufacture of an electrical discharge lamp comprising a lamp envelope, electrodes and leads therefor and a vapour fill including metal halide the improvement which comprises eliminating traces of water vapour from the finished lamp by the steps of: introducing into the lamp envelope a quantity of phosphorus in the form of a metal phosphide sufficient to effectively getter said residual water vapour but insufficient to affect the luminous efficacy of light from said lamp; sealing said envelope; and operating said lamp and thereby causing said phosphorus to getter said water vapour.
Claim 8
Dependent Claim
93 words
In the manufacture of an electrical discharge lamp comprising a lamp envelope, electrodes and leads therefor and a vapour fill including metal halide the improvement which comprises eliminating traces of water vapour from the finished lamp by the steps of: introducing into the lamp envelope a quantity of phosphorus in the form of a metal phosphide sufficient to effectively getter said residual water vapour but insufficient to affect the luminous efficacy of light from said lamp; sealing said envelope; and operating said lamp and thereby causing said phosphorus to getter said water vapour.
References Cited (Backward Citations)
US3898500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |