US3234856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propulsion system
Assignee: Individual
•
Filing: 1964-01-31
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Granted: 1966-02-15
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Expires: 1984-01-31
Abstract
No abstract record available.
Inventors
- 👤 James H Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:25
CPC Classifications
B; B63; B63H; B63H23/00; B63H23/30; F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/4061; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87056; Y10T74/00; Y10T74/20; Y10T74/20012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A HYDRAULIC PROPULSION SYSTEM INCLUDING AN ENGINE, PUMP, DISTRIBUTION SYSTEM, AND HYDRAULIC MOTORS, THE IMPROVEMENT COMPRISING A UNITARY CONTROL DEVICE CAPABLE OF SIMULTANEOUSLY CONTROLLING FORWARD AND BACKWARD MOVEMENT, TURNING AND SPEED, WHEREIN SAID UNITARY CONTROL DEVICE INCLUDES A DIFFERENTIAL VALVE MEANS HAVING A FIRST VALVE CAPABLE OF CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO A FIRST HYDRAULIC MOTOR IN A FORWARD AND REVERSE DIRECTION AND A SECOND VALVE CAPABLE OF CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO A SECOND HYDRAULIC MOTOR IN A FORWARD OR REVERSE DIRECTION.
Claim 2
Dependent Claim
90 words
IN A HYDRAULIC PROPULSION SYSTEM INCLUDING AN ENGINE, PUMP, DISTRIBUTION SYSTEM, AND HYDRAULIC MOTORS, THE IMPROVEMENT COMPRISING A UNITARY CONTROL DEVICE CAPABLE OF SIMULTANEOUSLY CONTROLLING FORWARD AND BACKWARD MOVEMENT, TURNING AND SPEED, WHEREIN SAID UNITARY CONTROL DEVICE INCLUDES A DIFFERENTIAL VALVE MEANS HAVING A FIRST VALVE CAPABLE OF CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO A FIRST HYDRAULIC MOTOR IN A FORWARD AND REVERSE DIRECTION AND A SECOND VALVE CAPABLE OF CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO A SECOND HYDRAULIC MOTOR IN A FORWARD OR REVERSE DIRECTION.
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |