US2932237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-periscopes
Assignee: Individual
•
Filing: 1957-04-02
•
Granted: 1960-04-12
•
Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Frank G Back
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:37
CPC Classifications
G; G03; G03B; G03B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US959013A
Cited
US1098905A
Cited
US1021809A
Cited
US1520245A
Cited
US1687193A
Cited
US1947729A
Cited
US2311769A
Cited
US2556769A
Cited
US2593088A
Cited
US2763177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |