US3848152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp having a fused silica glass envelope
Assignee: Corning Glass Works
•
Filing: 1972-06-06
•
Granted: 1974-11-12
•
Expires: 1992-06-06
Abstract
Abstract An electric lamp comprises a light source within a glass envelope adapted to operate at temperatures above 800*C. under pressures ranging up to 100 atmospheres. The lamp may be a tungsten halide incandescent type or a discharge type such as a mercury vapor or metal halide lamp. The envelope is composed of a fused silica glass containing, on a cation mole percent basis, 0.01-1.0% of an additive selected from the group consisting of SnO2, GeO2, Fe2O3, WO3, MoO3 and Ta2O5.
Inventors
- 👤 P Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:27
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06; H; H01; H01J; H01J5/00; H01J5/02; H01J5/04; H01J61/00; H01J61/02; H01J61/30; H01J61/302; C03C2201/00; C03C2201/06; C03C2201/30; C03C2201/31; C03C2201/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
AN ELECTRIC LAMP CAPABLE OF OPERATION AT A TEMPERATURE OF 800*-1150*C. UNDER AN INTERNAL PRESSURE OF UP TO 100 ATMOSPHERE COMPRISING A LIGHT SOURCE WITHIN A GLASS ENVELOPE, SAID GLASS ENVELOPE BEING COLORLESS AND ULTRAVIOLET ABSORBING AND CONSISTING ESSENTIALLY OF A HIGH PURITY FUSED SILICA GLASS CONTAINING, AS AN ADDITIVE TO ITS COMPOSITION ON A CATION MOLE PERCENT BASIS, 0.01-1.0% OF AN OXIDE SELECTED FROM THE GROUP CONSISTING OF SNO2, GEO2, FE2O3, WO3, MOO3, AND TA2O5.
Claim 2
Dependent Claim
76 words
AN ELECTRIC LAMP CAPABLE OF OPERATION AT A TEMPERATURE OF 800*-1150*C. UNDER AN INTERNAL PRESSURE OF UP TO 100 ATMOSPHERE COMPRISING A LIGHT SOURCE WITHIN A GLASS ENVELOPE, SAID GLASS ENVELOPE BEING COLORLESS AND ULTRAVIOLET ABSORBING AND CONSISTING ESSENTIALLY OF A HIGH PURITY FUSED SILICA GLASS CONTAINING, AS AN ADDITIVE TO ITS COMPOSITION ON A CATION MOLE PERCENT BASIS, 0.01-1.0% OF AN OXIDE SELECTED FROM THE GROUP CONSISTING OF SNO2, GEO2, FE2O3, WO3, MOO3, AND TA2O5.
Claim 3
Dependent Claim
28 words
A high temperature electric lamp in accordance with claim 1 wherein the amount of oxide additive in the lamp envelope glass does not exceed 0.4 cation mole percent.
Claim 4
Dependent Claim
36 words
A high temperature electric lamp in accordance with claim 1 wherein the glass envelope is composed of a ''''dry'''' fused silica having a relatively low hydroxyl ion content as expressed by a beta content below 0.10.
References Cited (Backward Citations)
US2795721A
Cited
US2895839A
Cited
US3253174A
Cited
US3581137A
Cited
US3573939A
Cited
US3644607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |