US2710560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical prism system
Assignee: D GORDON ANGUS
•
Filing: 1949-05-31
•
Granted: 1955-06-14
•
Expires: 1969-05-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth B Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:53
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US230320A
Cited
DE603839C
Cited
GB190901965A
Cited
US2364811A
Cited
US2430779A
Cited
US2456521A
Cited
US2472600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-13 | 1958-12-13 | 1959-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-13 | 1962-12-13 | 1963-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-13 | 1966-12-13 | 1967-06-14 | $7700.00 | Window Closed / Lapsed |