Patent US1535903A successfully refreshed from Google Patents.
Patent US3547369A successfully refreshed from Google Patents.
US3547369A
Expired / Lapsed
US
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Film tension control device
Assignee: Bell and Howell Co
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Filing: 1968-09-12
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Granted: 1970-12-15
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Expires: 1988-09-12
Abstract
No abstract record available.
Inventors
- 👤 Frank R Potucek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:15
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/43; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43; B; B65; B65H; B65H2301/00; B65H2301/30; B65H2301/31; B65H2301/311; B65H2301/3112
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |