Patent US2570941A successfully refreshed from Google Patents.
US2570941A
Expired / Lapsed
US
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Mechanical lifting device
Assignee: AMERICAN PAPER Co Inc
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Filing: 1949-04-13
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Granted: 1951-10-09
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Expires: 1969-04-13
Abstract
No abstract record available.
Inventors
- 👤 William M Grigsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:01
CPC Classifications
B; B65; B65H; B65H16/00; B65H16/02; B65H16/06; B65H19/00; B65H19/10; B65H19/12; B65H19/126; B65H2301/00; B65H2301/40; B65H2301/41; B65H2301/417; B65H2301/4171; B65H2301/4173; B65H2301/418; B65H2301/4185
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 |