US3091929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative hydraulic circuit
Assignee: Webster Electric Co Inc
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Filing: 1961-10-16
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Granted: 1963-06-04
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 William J Hipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:04
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; B; B62; B62D; B62D5/00; B62D5/06; B62D5/062; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20569; F15B2211/20576; F15B2211/21; F15B2211/214; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/40523; F15B2211/4053; F15B2211/42; F15B2211/428; F15B2211/45; F15B2211/455; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/55
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
IN A HYDRAULIC SYSTEM FOR SUPPLYING FLUID TO A FLUID OPERATED DEVICE, TWO POSITIVE DISPLACEMENT PUMPS, MEANS INCLUDING A COMMON VARIABLE SPEED PRIME MOVER DRIVING BOTH OF SAID PUMPS, AND CONTROL VALVING CONNECTED TO BOTH PUMPS TO RECEIVE OUTPUT FLUID THEREFROM, SAID CONTROL VALVING INCLUDING MEANS NORMALLY EFFECTIVE BELOW A PRESELECTED SPEED OF SAID PRIME MOVER TO DELIVER THE OUTPUTS OF BOTH PUMPS TO SAID FLUID OPERATED DEVICE AND FURTHER INCLUDING MEANS AUTOMATICALLY OPERATIVE ABOVE A PREDETERMINED SPEED OF SAID PRIME MOVER FOR DISCONTINUING THE PUMPING FUNCTION OF ONE PUMP AND FOR USING EXCESS FLUID FROM THE OTHER PUMP TO CAUSE SAID ONE PUMP TO OPERATE AS A FLUID MOTOR, THUS ASSISTING THE PRIME MOVER IN DRIVING SAID OTHER PUMP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |