US2933012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable microfilm unit
Assignee: Individual
•
Filing: 1957-06-21
•
Granted: 1960-04-19
•
Expires: 1977-06-21
Abstract
No abstract record available.
Inventors
- 👤 Donald E Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:20
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/46; G03B27/465
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1282117A
Cited
US2251335A
Cited
US2470844A
Cited
US2699088A
Cited
US2697961A
Cited
US2813456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |