Patent US2546540A successfully refreshed from Google Patents.
US2546540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual film camera
Assignee: Individual
•
Filing: 1948-03-30
•
Granted: 1951-03-27
•
Expires: 1968-03-30
Abstract
No abstract record available.
Inventors
- 👤 James F Gruben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:30
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04; G03B19/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2245606A
Cited
US2420628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |