US3233407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control apparatus and control valve therefor
Assignee: Individual
•
Filing: 1964-03-23
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Granted: 1966-02-08
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Expires: 1984-03-23
Abstract
No abstract record available.
Inventors
- 👤 Smith Darcy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/08; B63H25/14; B63H25/26; B63H25/28; F; F15; F15B; F15B7/00; F15B7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
HYDRAULIC CONTROL APPARATUS COMPRISING A HOUSING HAVING A GEAR PUMP THEREIN OPERABLE SELECTIVELY TO DIRECT FLUID THROUGH MAIN PASSAGES HAVING CHECK VALVES THEREIN TO EITHER OF TWO OPERATING PORTS IN THE HOUSING, A RESERVOIR ADAPTED TO DIRECT FLUID THROUGH CHECK VALVES TO OPPOSITE SIDES OF THE PUMP, RETURN PASSAGES IN THE HOUSING ADAPTED TO DIRECT FLUID THROUGH ADDITIONAL CHECK VALVES FROM THE OPERATING PORTS TO THE RESERVOIR, A SHUTTLE VALVE IN THE HOUSING MOVABLE TO CLOSE EITHER RETURN PASSAGE AND SIMULTANEOUSLY OPEN THE OTHER RETURN PASSAGE, MEANS ON THE SHUTTLE VALVE ADAPTED TO OPEN THE CHECK VALVE OF EITHER RETURN PASSAGE WHEN THE VALVE IS MOVED TO OPEN SAID EITHER RETURN PASSAGE, AND PASSAGE MEANS EXTENDING FROM OPPOSITE SIDES OF THE PUMP TO DIRECT PRESSURE FLUID FROM SAID PUMP TO MOVE THE SHUTTLE VALVE TO CLOSE EITHER RETURN PASSAGE WHEN THE PUMP IS DIRECTING FLUID TO THE OPERATING PORT OF THE LATTER RETURN PASSAGE.
Claim 2
Dependent Claim
154 words
HYDRAULIC CONTROL APPARATUS COMPRISING A HOUSING HAVING A GEAR PUMP THEREIN OPERABLE SELECTIVELY TO DIRECT FLUID THROUGH MAIN PASSAGES HAVING CHECK VALVES THEREIN TO EITHER OF TWO OPERATING PORTS IN THE HOUSING, A RESERVOIR ADAPTED TO DIRECT FLUID THROUGH CHECK VALVES TO OPPOSITE SIDES OF THE PUMP, RETURN PASSAGES IN THE HOUSING ADAPTED TO DIRECT FLUID THROUGH ADDITIONAL CHECK VALVES FROM THE OPERATING PORTS TO THE RESERVOIR, A SHUTTLE VALVE IN THE HOUSING MOVABLE TO CLOSE EITHER RETURN PASSAGE AND SIMULTANEOUSLY OPEN THE OTHER RETURN PASSAGE, MEANS ON THE SHUTTLE VALVE ADAPTED TO OPEN THE CHECK VALVE OF EITHER RETURN PASSAGE WHEN THE VALVE IS MOVED TO OPEN SAID EITHER RETURN PASSAGE, AND PASSAGE MEANS EXTENDING FROM OPPOSITE SIDES OF THE PUMP TO DIRECT PRESSURE FLUID FROM SAID PUMP TO MOVE THE SHUTTLE VALVE TO CLOSE EITHER RETURN PASSAGE WHEN THE PUMP IS DIRECTING FLUID TO THE OPERATING PORT OF THE LATTER RETURN PASSAGE.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |