US4435045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Built-up mirror with reduced temperature gradient
Assignee: Lockheed Martin Corp
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Filing: 1982-04-29
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Granted: 1984-03-06
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Expires: 2002-04-29
Abstract
Abstract A built-up glass mirror structure of the type having front and rear plateseld in spaced relation by spacer walls arranged in a cellular pattern has temperature gradients reduced by inclusion of highly reflective coating, such as silvering, of the spacer wall surfaces in each cell in combination with the inwardly facing surfaces at opposite ends of the cells being relatively highly emissive and absorptive of radiant thermal energy.
Inventors
- 👤 Lawrence Fried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:24
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/234; Y10T428/236; Y10T428/24; Y10T428/24149; Y10T428/24165; Y10T428/24174
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A frit bonded, built-up glass mirror for use in orbital space, said miror comprising: a glass front wall; a glass rear wall disposed in predetermined spaced relation to said front wall; a plurality of glass spacer walls interconnecting said front and rear walls and arranged in a pattern defining a plurality of cells the cell ends of which are defined by the inner surfaces of said front and rear walls and the cell sides of which are defined by the surfaces of said spacer walls; a reflective coating on the outer surface of said front wall; said inner surfaces of said front and rear walls being characterized as relatively highly emissive and absorptive of radiant energy; and said surfaces of said spacer walls being coated with a reflective layer of highly specular material, whereby radiant energy emitted from one of said end walls of a cell is reflected to and absorbed by the other of said end walls of said cell.
Claim 2
Dependent Claim
161 words
A frit bonded, built-up glass mirror for use in orbital space, said miror comprising: a glass front wall; a glass rear wall disposed in predetermined spaced relation to said front wall; a plurality of glass spacer walls interconnecting said front and rear walls and arranged in a pattern defining a plurality of cells the cell ends of which are defined by the inner surfaces of said front and rear walls and the cell sides of which are defined by the surfaces of said spacer walls; a reflective coating on the outer surface of said front wall; said inner surfaces of said front and rear walls being characterized as relatively highly emissive and absorptive of radiant energy; and said surfaces of said spacer walls being coated with a reflective layer of highly specular material, whereby radiant energy emitted from one of said end walls of a cell is reflected to and absorbed by the other of said end walls of said cell.
Claim 3
Dependent Claim
33 words
A mirror as defined in claim 1, and wherein: said front, rear, and spacer walls are formed of low expansion glass; and said reflective layer of highly specular material comprises a metallic layer.
Claim 4
Dependent Claim
14 words
A mirror as defined in claim 2 and wherein: said metallic layer is silver.
Claim 5
Dependent Claim
28 words
A mirror as defined in claim 3, and wherein: said inner surfaces of said front and rear walls have been treated to enhance the emissivity and absorptivity thereof.
Claim 6
Dependent Claim
33 words
A mirror as defined in claim 4, and wherein: said reflective coating on said outer surface of said front wall comprises a layer of a laser-reflective dielectric material over an opaque metallic layer.
Claim 7
Dependent Claim
99 words
In a mirror built-up of frit bonded glass wall components to comprise a plurality of cells having front, back and side walls, the front walls of which carry an outwardly facing reflective surface adapted to be cyclically directed toward and from the sun, the improvement comprising a reflective coating on the surfaces of said side walls, so that energy radiated from the inner surface of said front walls of said cells is reflected by said reflective coating on said side walls and absorbed by the rear walls, whereby maximum temperature differences between said front and rear walls are reduced.
Claim 8
Dependent Claim
99 words
In a mirror built-up of frit bonded glass wall components to comprise a plurality of cells having front, back and side walls, the front walls of which carry an outwardly facing reflective surface adapted to be cyclically directed toward and from the sun, the improvement comprising a reflective coating on the surfaces of said side walls, so that energy radiated from the inner surface of said front walls of said cells is reflected by said reflective coating on said side walls and absorbed by the rear walls, whereby maximum temperature differences between said front and rear walls are reduced.
Claim 9
Dependent Claim
27 words
The improvement in a mirror as defined in claim 6, and wherein said reflective coating on the surfaces of said side walls comprise metallic specularly reflecting layer.
Claim 10
Dependent Claim
17 words
The improvement in a mirror as defined in claim 7, and wherein said reflective coating comprises silver.
Claim 11
Dependent Claim
35 words
The improvement in a mirror as defined in claim 7, and wherein the inner surfaces of said front and rear walls are nonspecular so as to be relatively highly emissive and absorptive of radiant energy.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |