US3889142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal halide discharge lamp having heat reflective coating
Assignee: GTE Sylvania Inc
•
Filing: 1974-03-25
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Granted: 1975-06-10
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Expires: 1994-03-25
Abstract
Abstract The arc tube ends of a metal halide arc discharge lamp have a heat reflective coating thereon. The coating comprises zirconium dioxide and zirconium diboride.
Inventors
- 👤 William M Keeffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:03
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
55 words
AN ARC DISCHARGE LAMP COMPRISING AN ARC TUBE, MADE OF HIGH SILICA GLASS AND HAVING PRESS SEALS AT EACH END, CONTAINING A FILLING INCLUDING INERT STARTING GAS, MERCURY AND METAL HALIDE, HAVING ELECTRODES SEALED THEREIN AT OPPOSITE ENDS AND HAVING A HEAT REFLECTIVE COATING OF ZRO2 AND ZRB2 ON THE ENDS OF SAID ARC TUBE.
Claim 2
Dependent Claim
55 words
AN ARC DISCHARGE LAMP COMPRISING AN ARC TUBE, MADE OF HIGH SILICA GLASS AND HAVING PRESS SEALS AT EACH END, CONTAINING A FILLING INCLUDING INERT STARTING GAS, MERCURY AND METAL HALIDE, HAVING ELECTRODES SEALED THEREIN AT OPPOSITE ENDS AND HAVING A HEAT REFLECTIVE COATING OF ZRO2 AND ZRB2 ON THE ENDS OF SAID ARC TUBE.
Claim 3
Dependent Claim
17 words
The lamp of claim 1 wherein said coating surrounds said electrodes and extends onto said press seals.
Claim 4
Dependent Claim
21 words
The lamp of claim 1 wherein the ratio of ZrO2 to ZrB2 in said coating is between about 30:1 and 250:1.
Claim 5
Dependent Claim
28 words
The lamp of claim 1 including, in addition, metal supports clamped on said press seals and an uncoated space between said metal supports and said heat reflective coating.
References Cited (Backward Citations)
US3662203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |