US2924142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferential polarizing device for study of phase objects
Assignee: Centre National de la Recherche Scientifique
•
Filing: 1953-05-11
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Granted: 1960-02-09
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Expires: 1973-05-11
Abstract
No abstract record available.
Inventors
- 👤 Nomarski Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:54
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2732759A
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US942393A
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US2460515A
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US2516905A
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US2601175A
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US2660922A
Cited
GB648801A
Cited
US2777360A
Cited
US2785601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |