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US3453822A
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Assignee: American Hoist and Derrick Co
•
Filing: 1967-01-16
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Granted: 1969-07-08
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Expires: 1987-01-16
Abstract
No abstract record available.
Inventors
- 👤 Edward J Crook Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:01
CPC Classifications
F; F16; F16G; F16G15/00; F16G15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA731881A
Cited
US1513729A
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US2837890A
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US2972223A
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US3104519A
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US3134221A
Cited
US3241309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |