US2801570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror type optical objectives for microscopes
Assignee: Centre National de la Recherche Scientifique
•
Filing: 1953-05-25
•
Granted: 1957-08-06
•
Expires: 1973-05-25
Abstract
No abstract record available.
Inventors
- 👤 Nomarski Georges
- 👤 Rousseau Picrre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:34
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02; G02B21/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2520634A
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US2703506A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |