US3308844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus
Assignee: Dana Inc
•
Filing: 1964-10-02
•
Granted: 1967-03-14
•
Expires: 1984-10-02
Abstract
No abstract record available.
Inventors
- 👤 Wayne R Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:58
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/2582; Y10T137/265; Y10T137/2663; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702; Y10T137/8671; Y10T137/87169
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN COMBINATION WITH HYDRAULIC CONTROL APPARATUS INCLUDING AT LEAST ONE OPEN CENTER VALVE AND A VARIABLE DELIVERY PUMP, CONTROL VALVE MEANS COMPRISING IN COMBINATION: A VALVE BODY INCLUDING AN AXIALLY EXTENDING BORE AND AT LEAST THREE AXIALLY DISPLACED, RADIALLY EXTENDING GROOVES, ONE OF SAID GROOVES BEING CONNECTED TO AN INLET PORT AND ONE OF SAID GROOVES BEING CONNECTED TO AN OUTLET PORT; A VALVE MEMBER RECIPROCABLY JOURNALED IN SAID BORE, SAID VALVE MEMBER HAVING MEANS OPERATIVE IN A FIRST POSITION TO PROVIDE FLUID COMMUNICATION INTERMEDIATE SAID INLET AND OUTLET PORTS AND IN A SECOND POSITION TO PROVIDE FLUID COMMUNICATION INTERMEDIATE SAID INLET PORT THROUGH THE OTHER OF SAID GROOVES TO AT LEAST ONE OPEN CENTER VALVE; MEANS BIASING SAID VALVE MEMBER TOWARD SAID SECOND POSITION; AND MEANS OPERATIVE TO SELECTIVELY DRIVE SAID VALVE MEMBER TO SAID FIRST POSITION.
Claim 2
Dependent Claim
138 words
IN COMBINATION WITH HYDRAULIC CONTROL APPARATUS INCLUDING AT LEAST ONE OPEN CENTER VALVE AND A VARIABLE DELIVERY PUMP, CONTROL VALVE MEANS COMPRISING IN COMBINATION: A VALVE BODY INCLUDING AN AXIALLY EXTENDING BORE AND AT LEAST THREE AXIALLY DISPLACED, RADIALLY EXTENDING GROOVES, ONE OF SAID GROOVES BEING CONNECTED TO AN INLET PORT AND ONE OF SAID GROOVES BEING CONNECTED TO AN OUTLET PORT; A VALVE MEMBER RECIPROCABLY JOURNALED IN SAID BORE, SAID VALVE MEMBER HAVING MEANS OPERATIVE IN A FIRST POSITION TO PROVIDE FLUID COMMUNICATION INTERMEDIATE SAID INLET AND OUTLET PORTS AND IN A SECOND POSITION TO PROVIDE FLUID COMMUNICATION INTERMEDIATE SAID INLET PORT THROUGH THE OTHER OF SAID GROOVES TO AT LEAST ONE OPEN CENTER VALVE; MEANS BIASING SAID VALVE MEMBER TOWARD SAID SECOND POSITION; AND MEANS OPERATIVE TO SELECTIVELY DRIVE SAID VALVE MEMBER TO SAID FIRST POSITION.
References Cited (Backward Citations)
US2247141A
Cited
US2526709A
Cited
US2702529A
Cited
US2790427A
Cited
US2971536A
Cited
US2964057A
Cited
US3185175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |