Patent US2949820A successfully refreshed from Google Patents.
US2949820A
Expired / Lapsed
US
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Optical systems
Assignee: Optische Industrie de Oude Delft NV
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Filing: 1956-12-26
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Granted: 1960-08-23
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Becker Johannes
- 👤 Blaisse Berndt Stephan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:11
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884
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) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |