US3721054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light weight telescoping boom
Assignee: NORTHWEST ENGINEERING Co A CORP OF
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Filing: 1971-09-07
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Granted: 1973-03-20
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Expires: 1991-09-07
Abstract
Abstract A MULTI-SECTION TELESCOPIC BOOM HAS A SEPARATE, SINGLE ACTING HYDRAULIC CYLINDER FOR EXTENDING EACH MOVABLE SECTION AND A SINGLE CABLE FOR RETRACTING ALL OF THE SECTIONS. THE OUTERMOST SECTIONS HAVE SUPPORT FEET AT THEIR INNER ENDS WHICH STRADDLE THE CYLINDERS FOR THE NEXT INNER SECTIONS, THUS ELIMINATING GUARD PARTITIONS. A BIDIRECTIONAL FLOW DIVIDER SYSTEM IS USED TO SYNCHRONIZE EXTENSION AND RETRACTION OF THE SEVERAL SECTIONS, AND PRESSURE RELIEF VALVE IN THE SYSTEM ALLOW FOR RESYNCHRONIZATION.
Inventors
- 👤 J Hornagold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:38
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
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 |