US3199539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportioning control valve for hydraulic cylinders
Assignee: Individual
•
Filing: 1963-07-12
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Granted: 1965-08-10
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Expires: 1983-07-12
Abstract
No abstract record available.
Inventors
- 👤 Mckinley B Leathem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:02
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/16; B30B15/24; F; F15; F15B; F15B11/00; F15B11/16; F15B11/22; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86646; Y10T137/86662; Y10T137/86839
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A CONTROL VALVE FOR EQUALIZING PRESSURES IN A PLURALITY OF HYDRAULIC CYLINDERS, EACH HAVING A PISTON THEREIN ADAPTED FOR UNEQUAL LOADING CONDITIONS, THE SAID VALVE COMPRISING, IN COMBINATION, A HOUSING HAVING A PLURALITY OF FLUID INLET AND OUTLET PORTS THEREIN, A CYLINDRICAL VALVE ELEMENT ROTATIVELY ARRANGED IN SAID VALVE HOUSING AND CAPABLE OF LIMITED LONGITUDINAL MOVEMENT IN SAID HOUSING, THE SAID VALVE ELEMENT HAVING A PAIR OF SEPARATE PARALLEL CHAMBERS FORMED LONGITUDINALLY THEREOF, EACH HAVING A PORT INTERMEDIATE ITS ENDS ON OPPOSING SIDES OF SAID
Claim 2
Dependent Claim
86 words
IN A CONTROL VALVE FOR EQUALIZING PRESSURES IN A PLURALITY OF HYDRAULIC CYLINDERS, EACH HAVING A PISTON THEREIN ADAPTED FOR UNEQUAL LOADING CONDITIONS, THE SAID VALVE COMPRISING, IN COMBINATION, A HOUSING HAVING A PLURALITY OF FLUID INLET AND OUTLET PORTS THEREIN, A CYLINDRICAL VALVE ELEMENT ROTATIVELY ARRANGED IN SAID VALVE HOUSING AND CAPABLE OF LIMITED LONGITUDINAL MOVEMENT IN SAID HOUSING, THE SAID VALVE ELEMENT HAVING A PAIR OF SEPARATE PARALLEL CHAMBERS FORMED LONGITUDINALLY THEREOF, EACH HAVING A PORT INTERMEDIATE ITS ENDS ON OPPOSING SIDES OF SAID
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) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |