Patent US3905778A successfully refreshed from Google Patents.
US3905778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror with optically polished surface
Assignee: Westinghouse Electric Corp
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Filing: 1973-08-01
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Granted: 1975-09-16
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Expires: 1993-08-01
Abstract
Abstract A method is disclosed for reproducing a duplicate having a mirror optical surface from a master optical surface. In particular, a master is produced by conventional methods such as deposition and grinding to provide an optical surface. Next, a nonadhering layer of a reflective material is applied to the optical surface of the master, which may be used repeatedly. An adhesive is applied over the nonadhering layer and a suitable base structure is pressed into the adhesive. When the adhesive has been cured, the base, and adhesive and nonadhering layers are removed. The resulting surface of the nonadhering layer is a precise replica of the optical surface of the master.
Inventors
- 👤 Robert C Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:36
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; C; C25; C25D; C25D7/00; C25D7/08; B32B7/00; B32B7/04; B32B7/12; B32B2305/00; B32B2305/02; B32B2305/024; B32B2307/00; B32B2307/40; B32B2307/416; B32B2551/00; B32B2551/08; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/1234; Y10T428/12472; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12639; Y10T428/12646; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A MINOR ELEMENT COMPRISING: A. A BASE STRUCTURE, B. A FIRST LAYER OF A SUITABLE REFLECTIVE MATERIAL HAVING A FIRST OPTICALLY FLAT SURFACE AND A SECOND SURFACE ROUGH WITH RESPECT TO SAID FIRST SURFACE, AND C. A SECOND LAYER OF ADHESIVE MATERIAL FOR SECURING SAID FIRST LAYER OF REFLECTIVE MATERIAL TO SAID BASE STRUCTURE, SAID ADHESIVE MATERIAL HAVING A COEFFICIENT OF THERMAL EXPANSION SUFFICIENTLY SIMILAR TO THAT OF SAID BASE STRUCTURE AND SAID FIRST LAYER TO PREVENT STRESSES FROM DISTORTING SAID FIRST OPTICALLY FLAT SURFACES, D. SAID FIRST LAYER INCLUDING A PLURALITY OF SOLID PARTICLES DISPERSED IN SAID FIRST LAYER ADJACENT SAID SECOND, ROUGH
Claim 2
Dependent Claim
104 words
A MINOR ELEMENT COMPRISING: A. A BASE STRUCTURE, B. A FIRST LAYER OF A SUITABLE REFLECTIVE MATERIAL HAVING A FIRST OPTICALLY FLAT SURFACE AND A SECOND SURFACE ROUGH WITH RESPECT TO SAID FIRST SURFACE, AND C. A SECOND LAYER OF ADHESIVE MATERIAL FOR SECURING SAID FIRST LAYER OF REFLECTIVE MATERIAL TO SAID BASE STRUCTURE, SAID ADHESIVE MATERIAL HAVING A COEFFICIENT OF THERMAL EXPANSION SUFFICIENTLY SIMILAR TO THAT OF SAID BASE STRUCTURE AND SAID FIRST LAYER TO PREVENT STRESSES FROM DISTORTING SAID FIRST OPTICALLY FLAT SURFACES, D. SAID FIRST LAYER INCLUDING A PLURALITY OF SOLID PARTICLES DISPERSED IN SAID FIRST LAYER ADJACENT SAID SECOND, ROUGH
Claim 3
Dependent Claim
15 words
The mirror element as claimed in claim 1, wherein said solid particles comprise silicon carbide.
Claim 4
Dependent Claim
61 words
The mirror element as claimed in claim 1, wherein the first layer of reflective material includes a first layer portion forming said first surface and comprising said reflective material, and a second layer portion forming said second surface and having a plurality of said solid particles dispersed in said reflective material of increasing density as said second surface thereof is approached.
Claim 5
Dependent Claim
16 words
The mirror element as claimed in claim 1, wherein said base structure comprises a honeycomb-type core.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |