US2570773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film tensioning apparatus
Assignee: AT&T Inc
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Filing: 1949-12-06
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Granted: 1951-10-09
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Expires: 1969-12-06
Abstract
No abstract record available.
Inventors
- 👤 Charles C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:24
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/42; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/34; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19628
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |