US3150685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control with mechanically vented pump unloading means
Assignee: Caterpillar Inc
•
Filing: 1963-02-21
•
Granted: 1964-09-29
•
Expires: 1983-02-21
Abstract
No abstract record available.
Inventors
- 👤 Kenneth R Lohbauer
- 👤 James E Scheidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:51
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN A CONTROL VALVE INCLUDING A VALVE SPOOL SLIDABLY DISPOSED IN A VALVE BORE AND HAVING A LONGITUDINAL POSITION CORRESPONDING TO NEUTRAL, THE COMBINATION COMPRISING; A RELIEF VALVE IN COMMUNICATION WITH A CONDUIT FOR RECEIVING WORKING FLUID TO THE CONTROL VALVE, SAID VALVE HAVING A HYDROSTATIC CHAMBER WHICH FILLS WITH WORKING FLUID THAT COUNTERACTS PRESSURE FLUID URGING SAID RELIEF VALVE TO A BYPASS CONDITION, AND A VENT VALVE HYDRAULICALLY DISPOSED BETWEEN THE HYDROSTATIC CHAMBER OF SAID RELIEF VALVE AND A LOW PRESSURE SOURCE, SAID VALVE MECHANICALLY ASSOCIATED WITH THE VALVE SPOOL AND RESPONSIVE TO THE VALVE SPOOL BEING IN ITS NEUTRAL CONDITION TO FORM A THROUGH PATH FOR FLUID.
Claim 2
Dependent Claim
109 words
IN A CONTROL VALVE INCLUDING A VALVE SPOOL SLIDABLY DISPOSED IN A VALVE BORE AND HAVING A LONGITUDINAL POSITION CORRESPONDING TO NEUTRAL, THE COMBINATION COMPRISING; A RELIEF VALVE IN COMMUNICATION WITH A CONDUIT FOR RECEIVING WORKING FLUID TO THE CONTROL VALVE, SAID VALVE HAVING A HYDROSTATIC CHAMBER WHICH FILLS WITH WORKING FLUID THAT COUNTERACTS PRESSURE FLUID URGING SAID RELIEF VALVE TO A BYPASS CONDITION, AND A VENT VALVE HYDRAULICALLY DISPOSED BETWEEN THE HYDROSTATIC CHAMBER OF SAID RELIEF VALVE AND A LOW PRESSURE SOURCE, SAID VALVE MECHANICALLY ASSOCIATED WITH THE VALVE SPOOL AND RESPONSIVE TO THE VALVE SPOOL BEING IN ITS NEUTRAL CONDITION TO FORM A THROUGH PATH FOR FLUID.
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) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |