US3608434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual area hydraulic actuator
Assignee: United States Department of the Army
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Filing: 1970-01-13
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Granted: 1971-09-28
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Expires: 1990-01-13
Abstract
Abstract A PLURALITY OF FLUID CYLINDERS AND PISTONS ARE CONNECTED TO A SOURCE OF FLUID UNDER PRESSURE, AND THE CROSS-CONNECTED TO ONE ANOTHER THROUGH VALVING, SUCH THAT THE PISTON-CYLINDER ARRANGEMENT IS EXTENDED AT A RAPID RATE OF TRAVEL TO PUSH A FORCE-EXERTING ROD. WHEN THIS ROD MEETS A HIGH RESISTANCE LOAD A VALVE IS SHIFTED, AUTOMATICALLY, TO INCREASE THE FORCE OUTPUT WHILE TE PISTONCYLINDER AND ROD ADVANCES AT A REDUCED RATE OF TRAVEL.
Inventors
- 👤 Benny M Hillberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:00
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B2211/00; F15B2211/30; F15B2211/32; F15B2211/321; F15B2211/325; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/42; F15B2211/421; F15B2211/424; F15B2211/428; F15B2211/455; F15B2211/70; F15B2211/71; F15B2211/7107; F15B2211/775
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |