Patent US3238724A successfully refreshed from Google Patents.
US3238724A
Expired / Lapsed
US
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Control for hydrostatic transmissions
Assignee: Cessna Aircraft Co
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Filing: 1965-01-07
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Granted: 1966-03-08
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Expires: 1985-01-07
Abstract
No abstract record available.
Inventors
- 👤 Wendell E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:19
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/423; F16H61/433; F16H61/46; F16H61/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A HYDROSTATIC TRANSMISSION SYSTEM: A POWER DRIVEN VARIABLE DISPLACEMENT FLUID PUMP AS A SOURCE OF MOTIVE FLUID; A VARIABLE DISPLACEMENT FLUID DRIVEN MOTOR; MEANS OPERATIVELY AND CONNECTIVELY CONNECTING THE PORTS OF THE VARIABLE DISPLACEMENT FLUID PUMP AND THE VARIABLE DISPLACEMENT FLUID MOTOR FOR DRIVING THE FLUID MOTOR, SERVO MEANS OPERATIVELY CONNECTED TO THE VARIABLE DISPLACEMENT FLUID PUMP; SERVO MEANS OPERATIVELY CONNECTED TO THE VARIABLE DISPLACEMENT FLUID MOTOR, SAID SERVO MEANS BEING EFFECTIVE, WHEN ENERGIZED, TO VARY THE FLUID OUTPUT OF THE FLUID DISPLACEMENT PUMP AND THE FLUID CAPACITY OF SAID FLUID MOTOR; MEANS COMMUNICATIVELY CONNECTING THE SERVO MEANS FOR THE FLOW OF MOTIVE FLUID SERIALLY THERETHROUGH; AND CONTROL MEANS RESPONSIVE TO THE POSITION OF THE RESPECTIVE SERVO MEANS FOR SEQUENTIALLY VARYING THE FLUID DISPLACEMENTS OF THE FLUID PUMP AND THE FLUID MOTOR IN A PREDETERMINED ORDER.
Claim 2
Dependent Claim
137 words
IN A HYDROSTATIC TRANSMISSION SYSTEM: A POWER DRIVEN VARIABLE DISPLACEMENT FLUID PUMP AS A SOURCE OF MOTIVE FLUID; A VARIABLE DISPLACEMENT FLUID DRIVEN MOTOR; MEANS OPERATIVELY AND CONNECTIVELY CONNECTING THE PORTS OF THE VARIABLE DISPLACEMENT FLUID PUMP AND THE VARIABLE DISPLACEMENT FLUID MOTOR FOR DRIVING THE FLUID MOTOR, SERVO MEANS OPERATIVELY CONNECTED TO THE VARIABLE DISPLACEMENT FLUID PUMP; SERVO MEANS OPERATIVELY CONNECTED TO THE VARIABLE DISPLACEMENT FLUID MOTOR, SAID SERVO MEANS BEING EFFECTIVE, WHEN ENERGIZED, TO VARY THE FLUID OUTPUT OF THE FLUID DISPLACEMENT PUMP AND THE FLUID CAPACITY OF SAID FLUID MOTOR; MEANS COMMUNICATIVELY CONNECTING THE SERVO MEANS FOR THE FLOW OF MOTIVE FLUID SERIALLY THERETHROUGH; AND CONTROL MEANS RESPONSIVE TO THE POSITION OF THE RESPECTIVE SERVO MEANS FOR SEQUENTIALLY VARYING THE FLUID DISPLACEMENTS OF THE FLUID PUMP AND THE FLUID MOTOR IN A PREDETERMINED ORDER.
References Cited (Backward Citations)
US3126707A
Cited
US3107490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |