US2724993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical objectives of the inverted telephoto type
Assignee: Taylor Taylor and Hobson Ltd
•
Filing: 1952-06-02
•
Granted: 1955-11-29
•
Expires: 1972-06-02
Abstract
No abstract record available.
Inventors
- 👤 Cook Gordon Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:16
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1565205A
Cited
US1955590A
Cited
US1897262A
Cited
GB388215A
Cited
US2126126A
Cited
US2247068A
Cited
US2559844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |