Patent US4074168A successfully refreshed from Google Patents.
US4074168A
Expired / Lapsed
US
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Halogen incandescent lamp whose filler gas comprises bromine, chlorine and hydrogen
Assignee: US Philips Corp
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Filing: 1974-10-01
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Granted: 1978-02-14
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Expires: 1994-10-01
Abstract
Abstract Halogen incandescent lamp having a gas filling comprising dibromonethane (CH 2 Br 2 ) and carbontetrachloride (CCl 4 ).
Inventors
- 👤 Germain R. T'Jampens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:58
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A halogen incandescent lamp having a transparent sealed envelope, a filament supported therein, and means for supplying electric power to said filament, wherein said envelope contains carbon, hydrogen, bromine and chlorine and a gas selected from the group consisting of the rare gases and nitrogen, the ratio between said carbon, hydrogen, bromine and chlorine in gram atoms being between 1:1:1:2 and 1:1.8:1.8:0.4, and the ratio between hydrogen and bromine differing by less than 10% from 1.
Claim 2
Dependent Claim
76 words
A halogen incandescent lamp having a transparent sealed envelope, a filament supported therein, and means for supplying electric power to said filament, wherein said envelope contains carbon, hydrogen, bromine and chlorine and a gas selected from the group consisting of the rare gases and nitrogen, the ratio between said carbon, hydrogen, bromine and chlorine in gram atoms being between 1:1:1:2 and 1:1.8:1.8:0.4, and the ratio between hydrogen and bromine differing by less than 10% from 1.
Claim 3
Dependent Claim
39 words
A halogen incandescent lamp as claimed in claim 1, further including a mixture of dibromomethane and carbontetrachloride in a ratio of between 1:1 and 9:1 disposed in said envelope during initial assembly of said lamp and before operation thereof.
Claim 4
Dependent Claim
16 words
A halogen incandescent lamp as claimed in claim 1, further including bromodichloromethane disposed in said envelope.
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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |