Patent US3125856A successfully refreshed from Google Patents.
US3125856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-pressure hydraulic control system
Assignee: —
•
Filing: —
•
Granted: 1964-03-24
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Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:51
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1427; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A HYDRAULIC SYSTEM FOR MOVING A LOAD MEMBER IN RESPONSE TO ELECTRICAL INPUT SIGNALS, SAID SYSTEM COMPRISING: A REVERSIBLE HYDRAULIC MOTOR CONNECTED TO SAID LOAD MEMBER; A SOURCE OF PRESSURE FLUID AND CONNECTING MEANS INCLUDING AN ELECTRICALLY-ACTUATED CONTROL VALVE FOR PROVIDING A VARIABLE-FLOW RESISTANCE PATH BETWEEN SAID SOURCE AND MOTOR; AN ELECTRICALLY-ACTUATED BYPASS VALVE CONNECTED TO SAID SOURCE FOR CONTROLLABLY BYPASSING FLUID TO VARY THE OUTPUT PRESSURE OF THE PUMP; PUMP-PRESSURE SIGNAL MEANS CONNECTED TO SAID PUMP FOR PRODUCING AN ELECTRICAL PUMP-PRESSURE SIGNAL PROPORTIONAL TO THE PUMP OUTPUT PRESSURE;
Claim 2
Dependent Claim
89 words
A HYDRAULIC SYSTEM FOR MOVING A LOAD MEMBER IN RESPONSE TO ELECTRICAL INPUT SIGNALS, SAID SYSTEM COMPRISING: A REVERSIBLE HYDRAULIC MOTOR CONNECTED TO SAID LOAD MEMBER; A SOURCE OF PRESSURE FLUID AND CONNECTING MEANS INCLUDING AN ELECTRICALLY-ACTUATED CONTROL VALVE FOR PROVIDING A VARIABLE-FLOW RESISTANCE PATH BETWEEN SAID SOURCE AND MOTOR; AN ELECTRICALLY-ACTUATED BYPASS VALVE CONNECTED TO SAID SOURCE FOR CONTROLLABLY BYPASSING FLUID TO VARY THE OUTPUT PRESSURE OF THE PUMP; PUMP-PRESSURE SIGNAL MEANS CONNECTED TO SAID PUMP FOR PRODUCING AN ELECTRICAL PUMP-PRESSURE SIGNAL PROPORTIONAL TO THE PUMP OUTPUT PRESSURE;
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) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |