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US3446484A
Expired / Lapsed
US
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Fail safe device for load hoisting equipment
Assignee: United States Department of the Navy
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Filing: 1967-11-29
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Granted: 1969-05-27
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Expires: 1987-11-29
Abstract
No abstract record available.
Inventors
- 👤 Leonard Walsh
- 👤 William F Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:50
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/04; B66D2700/00; B66D2700/02; B66D2700/026; B66D2700/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2045533A
Cited
US3240474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |