US3153908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle hydraulic transmission mechanisms
Assignee: ZF International UK Ltd
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Filing: 1961-06-12
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Granted: 1964-10-27
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Expires: 1981-06-12
Abstract
No abstract record available.
Inventors
- 👤 Lawrence Owen Napier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:29
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/04; B60K17/10; F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/44; F16H61/456
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
FOR USE IN A VEHICLE PROVIDED WITH AN ENGINE, A HYDRAULIC TRANSMISSION MECHANISM OF THE KIND SPECIFIED, COMPRISING IN COMBINATION A PAIR OF VARIABLE STROKE HYDRAULIC MOTORS EACH PROVIDED WITH A LIQUID INLET AND A LIQUID OUTLET, AND WITH A MOVABLE STROKE-VARYING MEMBER, A HYDRAULIC PUMP, MEANS INTERCONNECTING SAID PUMP AND SAID MOTORS FOR ENABLING SAID PUMP TO SUPPLY MOTIVE LIQUID TO SAID MOTORS, A PAIR OF PRESSURE-RESPONSIVE DEVICES RESPECTIVELY ASSOCIATED WITH SAID MOTORS SO THAT VARIATIONS IN THE LIQUID PRESSURE DROP BETWEEN THE INLET AND OUTLET OF EACH MOTOR, DUE TO VARIATIONS IN THE SPEED OF THE LATTER, CAUSE MOVEMENTS OF THE ASSOCIATED PRESSURERESPONSIVE DEVICE, AND MEANS INTERCONNECTING SAID PRESSURE-RESPONSIVE DEVICES AND THE STROKE-VARYING MEMBERS OF SAID MOTORS SO THAT MOVEMENTS OF SAID PRESSURE-RESPONSIVE DEVICES VARY THE STROKES OF SAID MOTORS TO MAINTAIN THE LIQUID FLOW THERETHROUGH SUBSTANTIALLY CONSTANT FOR A GIVEN OUTPUT OF SAID PUMP.
Claim 2
Dependent Claim
147 words
FOR USE IN A VEHICLE PROVIDED WITH AN ENGINE, A HYDRAULIC TRANSMISSION MECHANISM OF THE KIND SPECIFIED, COMPRISING IN COMBINATION A PAIR OF VARIABLE STROKE HYDRAULIC MOTORS EACH PROVIDED WITH A LIQUID INLET AND A LIQUID OUTLET, AND WITH A MOVABLE STROKE-VARYING MEMBER, A HYDRAULIC PUMP, MEANS INTERCONNECTING SAID PUMP AND SAID MOTORS FOR ENABLING SAID PUMP TO SUPPLY MOTIVE LIQUID TO SAID MOTORS, A PAIR OF PRESSURE-RESPONSIVE DEVICES RESPECTIVELY ASSOCIATED WITH SAID MOTORS SO THAT VARIATIONS IN THE LIQUID PRESSURE DROP BETWEEN THE INLET AND OUTLET OF EACH MOTOR, DUE TO VARIATIONS IN THE SPEED OF THE LATTER, CAUSE MOVEMENTS OF THE ASSOCIATED PRESSURERESPONSIVE DEVICE, AND MEANS INTERCONNECTING SAID PRESSURE-RESPONSIVE DEVICES AND THE STROKE-VARYING MEMBERS OF SAID MOTORS SO THAT MOVEMENTS OF SAID PRESSURE-RESPONSIVE DEVICES VARY THE STROKES OF SAID MOTORS TO MAINTAIN THE LIQUID FLOW THERETHROUGH SUBSTANTIALLY CONSTANT FOR A GIVEN OUTPUT OF SAID 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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |