Patent US2707903A successfully refreshed from Google Patents.
US2707903A
Expired / Lapsed
US
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Composite mirrors of large area in particular for concentrating solar energy
Assignee: Centre National de la Recherche Scientifique
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Filing: 1952-04-10
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Granted: 1955-05-10
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Expires: 1972-04-10
Abstract
No abstract record available.
Inventors
- 👤 Trombe Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:02
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/10; F; F24; F24S; F24S23/00; F24S23/70; F24S23/71; F24S23/72; F24S2023/83; F24S2023/833; F24S2023/87; F24S2023/874; Y; Y02; Y02E; Y02E10/00; Y02E10/40
Claims Analysis
Total Claims: 0
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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) | 1958-05-09 | 1958-11-08 | 1959-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-09 | 1962-11-08 | 1963-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-09 | 1966-11-08 | 1967-05-10 | $7700.00 | Window Closed / Lapsed |