US4629936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten-halogen lamp with means for reducing filament embrittlement
Assignee: Osram Sylvania Inc
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Filing: 1985-02-11
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Granted: 1986-12-16
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Expires: 2005-02-11
Abstract
Abstract A tungsten-halogen lamp is provided that incorporates therein means for substantially reducing filament embrittlement. The embrittlement reducing means comprises substances X and Y, which have an X and Y mass ratio of about 30:1. Substance X is a phosphorus-based gaseous compound and substance Y is a carbon-containing gaseous compound. Substance X is preferably phosphine and substance Y is preferably methyl bromide.
Inventors
- 👤 Thomas G. Weld
- 👤 Mark D. Beschle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:40
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A tungsten-halogen incandescent lamp comprising; a light transmitting, hermetically sealed envelope; a pair of lead-in wires press sealed in said envelope and extending internally and externally of said envelope; a tungsten filament, attached between the internal ends of said lead-in wires, having a wire diameter of about 0.005 inch or less; a fill gas within said envelope comprising an inert gas and a halogen or halide; and means for substantially reducing filament embrittlement located within said envelope, said filament embrittlement reducing means comprising substances X and Y, said substances having an X to Y mass ratio in the range of about 30:1 to about 1:1., wherein said substance X is a phosphorus based compound that includes phosphine and said substance Y is a carbon-containing compound that includes methyl bromide.
Claim 2
Dependent Claim
129 words
A tungsten-halogen incandescent lamp comprising; a light transmitting, hermetically sealed envelope; a pair of lead-in wires press sealed in said envelope and extending internally and externally of said envelope; a tungsten filament, attached between the internal ends of said lead-in wires, having a wire diameter of about 0.005 inch or less; a fill gas within said envelope comprising an inert gas and a halogen or halide; and means for substantially reducing filament embrittlement located within said envelope, said filament embrittlement reducing means comprising substances X and Y, said substances having an X to Y mass ratio in the range of about 30:1 to about 1:1., wherein said substance X is a phosphorus based compound that includes phosphine and said substance Y is a carbon-containing compound that includes methyl bromide.
Claim 3
Dependent Claim
18 words
The lamp according to claim 1 wherein the phosphorus content is in an amount of about 12 micrograms.
Claim 4
Dependent Claim
18 words
The lamp according to claim 2 wherein the carbon content is in an amount of about 1.5 micrograms.
Claim 5
Dependent Claim
14 words
The lamp according to claim 2 wherein said phosphorus is of the yellow-type phosphorus.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |