US3879625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zirconia reflector coating on quartz lamp envelope
Assignee: General Electric Co
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Filing: 1973-10-09
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Granted: 1975-04-22
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Expires: 1993-10-09
Abstract
Abstract The adherence of an optically reflective coating of zirconium oxide on a fused silica discharge tube surface is improved severalfold by an intermediate adhesion layer consisting of very fine aluminum oxide and boric oxide powders. The adhesion layer is first applied and dried, the zirconium oxide coating is applied, and the quartz tube is then lehred at a temperature greater than 460*C., the melting point of boric oxide. The improved coating strength permits the use of a thicker layer of zirconium oxide for higher optical and thermal reflection.
Inventors
- 👤 Charles I Mcvey
- 👤 O Manuel Uy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:57
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/045; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
A FUSED SILICA ENVELOPE HAVING AN OPTICALLY REFLECTIVE COATING OF FINELY DIVIDED ZRO2 ADHERENT THERETO AND AN INTERMEDIATE ADHERSION LAYER CONSISTING VERY FINE ALUMINUM OXIDE AND BORIC OXIDE HEAT-REACTED WITH THE SILICA SURFACE, SAID COAT-
Claim 2
Dependent Claim
35 words
A FUSED SILICA ENVELOPE HAVING AN OPTICALLY REFLECTIVE COATING OF FINELY DIVIDED ZRO2 ADHERENT THERETO AND AN INTERMEDIATE ADHERSION LAYER CONSISTING VERY FINE ALUMINUM OXIDE AND BORIC OXIDE HEAT-REACTED WITH THE SILICA SURFACE, SAID COAT-
Claim 3
Dependent Claim
44 words
A fused silica envelope having an optically reflective coating of finely divided ZrO2 adherent thereto and an intermediate adhesion layer consisting of very fine aluminum oxide and boric oxide heat-reacted with the silica surface, said coating of zirconium being heat-reacted with said intermediate layer.
Claim 4
Dependent Claim
44 words
A fused silica envelope having an optically reflective coating of finely divided ZrO2 adherent thereto and an intermediate adhesion layer consisting of very fine aluminum oxide and boric oxide heat-reacted with the silica surface, said coating of zirconium being heat-reacted with said intermediate layer.
Claim 5
Dependent Claim
34 words
A fused silica envelope as in claim 1 wherein the weight of B2O3 in said intermediate layer is from 0.05 to 0.5 mg/cm2 and the weight of Al2O3 is from 0.05 to 1.5 mg/cm2.
Claim 6
Dependent Claim
22 words
A fused silica envelope as in claim 2 wherein the weight of ZrO2 in said coating is from 5 to 30 mg/cm2.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |