Patent US3963951A successfully refreshed from Google Patents.
US3963951A
Expired / Lapsed
US
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Metal halide discharge lamp having a reflective coating
Assignee: GTE Sylvania Inc
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Filing: 1975-06-20
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Granted: 1976-06-15
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Expires: 1995-06-20
Abstract
Abstract The arc tube of a high intensity arc discharge lamp is horizontally operated and has a longitudinal stripe of heat reflecting coating along the lower surface of the arc tube in order to improve lamp efficiency.
Inventors
- 👤 William I. Ramberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:30
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/045
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
In a metal halide arc discharge lamp of the type having an arc tube having electrodes at each end thereof and containing a fill including mercury, metal halide and a starting gas, the improvement which comprises a stripe of heat reflecting material longitudinally extending across the bottom of the arc tube when the arc tube is in a horizontal position.
Claim 2
Dependent Claim
60 words
In a metal halide arc discharge lamp of the type having an arc tube having electrodes at each end thereof and containing a fill including mercury, metal halide and a starting gas, the improvement which comprises a stripe of heat reflecting material longitudinally extending across the bottom of the arc tube when the arc tube is in a horizontal position.
Claim 3
Dependent Claim
30 words
The lamp of claim 1 wherein the ends of said arc tube have a coating of heat reflective material thereon and said stripe extends from one coating to the other.
Claim 4
Dependent Claim
23 words
The lamp of claim 1 including means to position said stripe lowermost during normal operation of the arc tube in a horizontal position.
References Cited (Backward Citations)
US3900750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |