Patent US2925751A successfully refreshed from Google Patents.
US2925751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrical optical system for binocular viewing devices
Assignee: Recon Optical Inc
•
Filing: 1954-08-09
•
Granted: 1960-02-23
•
Expires: 1974-08-09
Abstract
No abstract record available.
Inventors
- 👤 John R Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:34
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/14; G02B27/144; G02B17/00; G02B17/02; G02B17/04; G02B17/045
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1114232A
Cited
GB153325A
Cited
US2189298A
Cited
FR817698A
Cited
US2389646A
Cited
US2391675A
Cited
US2658422A
Cited
FR1028749A
Cited
US2674919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-22 | 1963-08-24 | 1964-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-22 | 1967-08-24 | 1968-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-22 | 1971-08-24 | 1972-02-23 | $7700.00 | Window Closed / Lapsed |