US2638033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary catadioptric objective lens system
Assignee: Individual
•
Filing: 1950-12-19
•
Granted: 1953-05-12
•
Expires: 1970-12-19
Abstract
No abstract record available.
Inventors
- 👤 Buchele Donald Robert
- 👤 Buchele William Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:50
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR338386A
Cited
GB190815188A
Cited
US929795A
Cited
US1616297A
Cited
US1653575A
Cited
US1797867A
Cited
US2097494A
Cited
US2176554A
Cited
US2244235A
Cited
US2477331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |