US2701983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catadioptric telephoto systems
Assignee: Individual
•
Filing: 1953-11-25
•
Granted: 1955-02-15
•
Expires: 1973-11-25
Abstract
No abstract record available.
Inventors
- 👤 Frank G Back
- 👤 Lowen Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:57
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0804; G02B17/0808; G02B17/0852
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2413286A
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US2378301A
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US2504383A
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US2441093A
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US2576436A
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DE824558C
Cited
US2608129A
Cited
US2610547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |