Patent US3721350A successfully refreshed from Google Patents.
US3721350A
Expired / Lapsed
US
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Boom extension control system
Assignee: FMC Corp
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Filing: 1970-02-12
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Granted: 1973-03-20
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Expires: 1990-02-12
Abstract
Abstract A BOOM EXTENSION CONTROL SYSTEM FOR EMPLOYMENT WITH HYDRAULICALLY EXTENSIBLE BOOMS HAVING HYDRAULIC LOAD LIFTING CABLE WINCHES EFFECTIVE TO PROVIDE AN INTERLOCK BETWEEN THE BOOM AND WINCH CONTROLS WHEREBY EXTENSION OF THE BOOM IS PREVENTED UNTIL THE WINCH IS OPERATED. D R A W I N G
Inventors
- 👤 O Nephew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:51
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/705; B66C13/00; B66C13/18; B66C2700/00; B66C2700/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |