Patent US2380887A successfully refreshed from Google Patents.
US2380887A
Expired / Lapsed
US
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Optical system
Assignee: Taylor Taylor and Hobson Ltd
•
Filing: 1942-03-10
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Granted: 1945-07-31
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Expires: 1962-03-10
Abstract
No abstract record available.
Inventors
- 👤 Warmisham Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0856; G02B17/086; G02B17/008; G02B17/0804; G02B17/0808; G02B17/0836; G02B17/084; G02B17/0884; G02B17/0888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-07-30 | 1949-01-29 | 1949-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-07-30 | 1953-01-29 | 1953-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-07-30 | 1957-01-29 | 1957-07-31 | $7700.00 | Window Closed / Lapsed |