US4268124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical reflector having a nickel-iron alloy reflecting surface
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1979-10-09
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Granted: 1981-05-19
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Expires: 1999-10-09
Abstract
Abstract There is disclosed an optical mirror consisting essentially of an electrodeposited nickel-iron face sheet having a relatively low temperature coefficient of expansion on a lightweight graphite backup substrate having approximately the same temperature coefficient of expansion as the electrodeposited nickel-iron face sheet.
Inventors
- 👤 Kenneth Lui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:59
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/18; G02B7/181; C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/562; G02B5/00; G02B5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
An optical mirror comprising a face sheet bonded to a lightweight substrate, said face sheet consisting essentially of a substantially homogeneous admixture of nickel and iron having a temperature expansion coefficient of less than about 5×10 -6 , said homogeneous admixture containing substantially no iron oxide, and said lightweight substrate consisting essentially of graphite epoxy composite having substantially the same temperature coefficient of expansion as said face sheet.
Claim 2
Dependent Claim
68 words
An optical mirror comprising a face sheet bonded to a lightweight substrate, said face sheet consisting essentially of a substantially homogeneous admixture of nickel and iron having a temperature expansion coefficient of less than about 5×10 -6 , said homogeneous admixture containing substantially no iron oxide, and said lightweight substrate consisting essentially of graphite epoxy composite having substantially the same temperature coefficient of expansion as said face sheet.
References Cited (Backward Citations)
FR2215631A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |