Patent US2905997A successfully refreshed from Google Patents.
US2905997A
Expired / Lapsed
US
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Safety lock for crane hook
Assignee: United States Steel Corp
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Filing: 1955-11-01
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Granted: 1959-09-29
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Expires: 1975-11-01
Abstract
No abstract record available.
Inventors
- 👤 Ramskill Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:00
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/22; B66C1/34; B66C1/36; F; F16; F16B; F16B45/00; F16B45/02; F16B45/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US521901A
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US1046795A
Cited
US1262419A
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US1386442A
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US1471117A
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US1914189A
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US2728967A
Cited
US2796651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |