Patent US3476457A successfully refreshed from Google Patents.
US3476457A
Expired / Lapsed
US
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Optical instrument with aligned mask and nonphasing coated screen
Assignee: Centre National de la Recherche Scientifique
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Filing: 1967-03-27
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Granted: 1969-11-04
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Expires: 1987-03-27
Abstract
No abstract record available.
Inventors
- 👤 Georges Nomarski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:25
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/14; G02B27/00; G02B27/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1501979A
Cited
US3090281A
Cited
US2959105A
Cited
US3045530A
Cited
US3178997A
Cited
US3180216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |