US3083535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic servo system
Assignee: Thompson Grinder Co
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Filing: 1961-09-12
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Granted: 1963-04-02
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Expires: 1981-09-12
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Krafft
- 👤 Ernst Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:14
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F04C14/22; F04C14/223; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F01C21/0818; F01C21/0854; F01C21/0863; F04C14/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A HYDRAULIC SERVO SYSTEM; A FLUID MOTOR COMPRISING A STATIONARY PART AND A RECIPROCABLE PART, A REVERSIBLE DELIVERY-VARIABLE DELIVERY PUMP CONNECTED TO OPPOSITE SIDES OF SAID MOTOR, SAID MOTOR HAVING EQUAL DISPLACEMENTS IN BOTH DIRECTIONS OF MOVEMENT, SAID PUMP INCLUDING A SHIFTABLE MEMBER IN THE PUMP MOVABLE FOR CONTROLLING THE RATE AND DIRECTION OF DELIVERY OF SAID PUMP, AND A SHIFTER ELEMENT CONNECTED TO SAID SHIFTABLE MEMBER AND EXTENDING FROM THE PUMP TO CONTROL THE SHIFTABLE MEMBER AND THUS TO CONTROL SAID MOTOR, A RESERVOIR, A CHECK VALVE OPENING FROM THE RESERVOIR TO EACH SIDE OF THE MOTOR,
Claim 2
Dependent Claim
99 words
IN A HYDRAULIC SERVO SYSTEM; A FLUID MOTOR COMPRISING A STATIONARY PART AND A RECIPROCABLE PART, A REVERSIBLE DELIVERY-VARIABLE DELIVERY PUMP CONNECTED TO OPPOSITE SIDES OF SAID MOTOR, SAID MOTOR HAVING EQUAL DISPLACEMENTS IN BOTH DIRECTIONS OF MOVEMENT, SAID PUMP INCLUDING A SHIFTABLE MEMBER IN THE PUMP MOVABLE FOR CONTROLLING THE RATE AND DIRECTION OF DELIVERY OF SAID PUMP, AND A SHIFTER ELEMENT CONNECTED TO SAID SHIFTABLE MEMBER AND EXTENDING FROM THE PUMP TO CONTROL THE SHIFTABLE MEMBER AND THUS TO CONTROL SAID MOTOR, A RESERVOIR, A CHECK VALVE OPENING FROM THE RESERVOIR TO EACH SIDE OF THE MOTOR,
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) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |