Patent US3841737A successfully refreshed from Google Patents.
US3841737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated mirror
Assignee: Raytheon Co
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Filing: 1972-07-03
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Granted: 1974-10-15
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Expires: 1992-07-03
Abstract
Abstract A mirror, and method of making same, is disclosed. The mirror includes a metallic base material having a low coefficient of thermal expansion, an intermediate layer bonded to the base by a plasma spray process and a reflecting surface overlying the intermediate layer, the coefficients of thermal expansion of the materials of the intermediate layer and the reflecting surface differing from each other and from the coefficient of thermal expansion of the base material.
Inventors
- 👤 W Rambauske
- 👤 J Grabowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:15
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/18; G02B7/181; G02B7/1815; Y; Y02; Y02E; Y02E30/00; Y02E30/10; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104; Y10T428/1234; Y10T428/12486; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/12861; Y10T428/12896; Y10T428/12903; Y10T428/12917; Y10T428/12924
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A mirror comprising: a. a metallic base having one surface thereof optically smooth and contoured to correspond with the shape desired for the reflecting surface of the mirror; b. a primary intermediate metallic layer fused to the optically smooth surface of the metallic base, the material of such layer having a higher coefficient of thermal expansion than the material of such base; and c. a reflecting surface overlying the primary intermediate layer.
Claim 2
Dependent Claim
72 words
A mirror comprising: a. a metallic base having one surface thereof optically smooth and contoured to correspond with the shape desired for the reflecting surface of the mirror; b. a primary intermediate metallic layer fused to the optically smooth surface of the metallic base, the material of such layer having a higher coefficient of thermal expansion than the material of such base; and c. a reflecting surface overlying the primary intermediate layer.
Claim 3
Dependent Claim
47 words
A mirror as in claim 1 comprising additionally: a. a secondary intermediate layer deposited electrolytically on the primary intermediate metallic layer, the material of such secondary layer being copper; and, b. a tertiary layer overlying the secondary intermediate layer, the material of such tertiary layer being silver.
Claim 4
Dependent Claim
39 words
A mirror as in claim 2 wherein: a. the material of the base is an alloy of nickel (35 percent) and iron; and b. the material of the primary intermediate metallic layer is tungsten carbide with a cobalt binder.
Claim 5
Dependent Claim
14 words
A mirror as in claim 3 wherein the material of the base is honeycombed.
Claim 6
Dependent Claim
21 words
A mirror as in claim 4 wherein at least some of the cells in the honeycombed base are filled with copper.
Claim 7
Dependent Claim
24 words
A mirror as in claim 4 having, additionally, means for passing a coolant through at least some of the cells in the honeycombed base.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |