US3648094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp combination comprising an improved envelope for tungsten-halogen incandescible projection lamp
Assignee: Philips North America LLC
•
Filing: 1970-04-15
•
Granted: 1972-03-07
•
Expires: 1990-04-15
Abstract
Abstract An incandescible projection lamp combination which utilizes a vitreous borosilicate glass, light transmitting envelope. The lamp utilizes a tungsten filament and a bromine containing atmosphere. The power loading is about 13.6 to 16.4 watts per cubic centimeter of lamp volume, whereby light output is essentially constant throughout life.
Inventors
- 👤 Aristide R Decaro
- 👤 Nicholas J Rainone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:35
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
The combination as specified in claim 1, wherein said borosilicate glass has a composition of about 80% silica, 14% boron oxide, 4% soda, and 2% alumina.
Claim 2
Dependent Claim
18 words
The combination as specified in claim 1, wherein said bromine is supplied to said lamp as methylene bromide.
Claim 3
Dependent Claim
24 words
The combination as specified in claim 1, wherein said inert fill gas is nitrogen at a pressure of from about 950 to 1,050 torrs.
Claim 4
Dependent Claim
24 words
The combination as specified in claim 3, wherein said methylene bromide is supplied in an amount of 0.4% by volume of the operative atmosphere.
Claim 5
Dependent Claim
15 words
The combination as specified in claim 1, wherein said filament iS a biplanar coiled filament.
Claim 6
Dependent Claim
36 words
The combination as specified in claim 1, wherein the minimum temperature of said envelope when said lamp is operated at nominal wattage input is about 340* C. and the maximum envelope temperature is about 525* C.
Claim 7
Dependent Claim
42 words
The combination as specified in claim 7, wherein said lamp has a nominal wattage input of 500 watts, said envelope has a cylindrical body portion with a diameter of about 32 mm., and said envelope encloses a volume of about 33 cc.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |