Patent US2957592A successfully refreshed from Google Patents.
US2957592A
Expired / Lapsed
US
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Attachment device for heavy duty cranes
Assignee: Individual
•
Filing: 1958-07-21
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Granted: 1960-10-25
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Expires: 1978-07-21
Abstract
No abstract record available.
Inventors
- 👤 Ernest K Thacker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:54
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/72; B66C23/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1938498A
Cited
US2663433A
Cited
US2767995A
Cited
US2750204A
Cited
US2804979A
Cited
US2788145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |