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US4033503A
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Method for attaching a fused-quartz mirror to a conductive metal substrate
Assignee: National Aeronautics and Space Administration
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Filing: 1976-08-27
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Granted: 1977-07-05
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Expires: 1996-08-27
Abstract
Abstract A method for attaching a fused-quartz mirror to a conductive metal substrate which comprises the steps of tinning one surface of a fused-quartz mirror with a solder of substantially pure indium, tinning a metallic substrate with an indium eutectic alloy consisting essentially of indium, bismuth, lead and tin having a melting point substantially below that of indium, heating the eutectic alloy to a temperature substantially above its melting point, but below that of the solder, floating the mirror into place, and subsequently cooling the alloy to a temperature substantially below its melting point.
Inventors
- 👤 with respect to an invention of Fletcher James C. Administrator of the National Aeronautics and Space Administration
- 👤 George Sonnenschein
- 👤 Daniel McKeown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:14
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/26; B23K35/264; B23K1/00; B23K1/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
A method for attaching a fused-quartz mirror to a conductive metal substrate comprising the steps of: A. tinning one substantially planar surface of a fused-quartz mirror with a solder of a class including pure indium solder; B. tinning a metal substrate with an indium eutectic alloy consisting essentially of indium, bismuth, lead and tin, having a melting point substantially below that of the solder; C. heating the alloy to a temperature substantially above its melting point, but below that of the solder; D. establishing a contiguous relationship between the tinned surface of the mirror and a surface of the alloy while maintaining the temperature of the alloy substantially above the melting point of the alloy; and E. cooling the alloy to a temperature substantially below its melting point while maintaining the established contiguous relationship between the surfaces of the mirror and the alloy.
Claim 2
Independent Claim
143 words
A method for attaching a fused-quartz mirror to a conductive metal substrate comprising the steps of: A. tinning one substantially planar surface of a fused-quartz mirror with a solder of a class including pure indium solder; B. tinning a metal substrate with an indium eutectic alloy consisting essentially of indium, bismuth, lead and tin, having a melting point substantially below that of the solder; C. heating the alloy to a temperature substantially above its melting point, but below that of the solder; D. establishing a contiguous relationship between the tinned surface of the mirror and a surface of the alloy while maintaining the temperature of the alloy substantially above the melting point of the alloy; and E. cooling the alloy to a temperature substantially below its melting point while maintaining the established contiguous relationship between the surfaces of the mirror and the alloy.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said eutectic alloy consists essentially of twenty parts by weight indium, fifty parts by weight bismuth, eighteen parts by weight lead, and twelve parts by weight tin.
Claim 4
Dependent Claim
31 words
The method of claim 1 further comprising the step of vibrating the mirror prior to cooling the alloy while the contiguous relation between the alloy and the tinned surface is maintained.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said metallic substrate includes an endless peripheral lip.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |