Patent US3286734A successfully refreshed from Google Patents.
US3286734A
Expired / Lapsed
US
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Three way pressure control servo valve
Assignee: Goodyear Tire and Rubber Co
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Filing: 1964-11-16
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Granted: 1966-11-22
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Expires: 1984-11-16
Abstract
No abstract record available.
Inventors
- 👤 Everett W Hartshorne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:40
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T8/3635; B60T8/3695; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A PRESSURE CONTROL VALVE INCLUDING A HOUSING, A BRAKE LINE, A PRESSURE LINE, AND A SUMP LINE CONNECTED TO THE HOUSING, A POWER VALVE MEANS IN THE HOUSING HAVING A CENTRAL NULL POSITION ISOLATING ALL LINES AND MOVABLE IN ONE DIRECTION TO A PRESSURE POSITION CONNECTING THE PRESSURE AND BRAKE LINES, AND MOVABLE IN THE OPPOSITE DIRECTION TO A DISCHARGE POSITION TO CONNECT THE BRAKE AND SUMP LINES, A FIRST PRESSURE CHAMBER AT ONE END OF THE POWER VALVE MEANS AND CONNECTED TO THE PRESSURE LINE AND TENDING TO MOVE THE POWER VALVE MEANS TO PRESSURE POSITION, A SECOND PRESSURE CHAMBER AT THE OTHER END OF THE POWER VALVE MEANS AND CONNECTED TO THE BRAKE LINE AND TENDING TO MOVE THE POWER VALVE MEANS TO DISCHARGE POSITION, PILOT VALVE MEANS IN THE HOUSING CONNECTED TO THE FIRST PRESSURE CHAMBER AND MOVABLE FROM A CLOSED POSITION HOLDING PRESSURE IN THE FIRST CHAMBER TO AN OPEN POSITION DISCHARGING PRESSURE FROM THE FIRST CHAMBER TO THE SUMP LINE, SPRING MEANS NORMALLY CLOSING THE PILOT VALVE, AND SOLENOID MEANS FOR OPENING THE PILOT VALVE.
Claim 2
Dependent Claim
180 words
A PRESSURE CONTROL VALVE INCLUDING A HOUSING, A BRAKE LINE, A PRESSURE LINE, AND A SUMP LINE CONNECTED TO THE HOUSING, A POWER VALVE MEANS IN THE HOUSING HAVING A CENTRAL NULL POSITION ISOLATING ALL LINES AND MOVABLE IN ONE DIRECTION TO A PRESSURE POSITION CONNECTING THE PRESSURE AND BRAKE LINES, AND MOVABLE IN THE OPPOSITE DIRECTION TO A DISCHARGE POSITION TO CONNECT THE BRAKE AND SUMP LINES, A FIRST PRESSURE CHAMBER AT ONE END OF THE POWER VALVE MEANS AND CONNECTED TO THE PRESSURE LINE AND TENDING TO MOVE THE POWER VALVE MEANS TO PRESSURE POSITION, A SECOND PRESSURE CHAMBER AT THE OTHER END OF THE POWER VALVE MEANS AND CONNECTED TO THE BRAKE LINE AND TENDING TO MOVE THE POWER VALVE MEANS TO DISCHARGE POSITION, PILOT VALVE MEANS IN THE HOUSING CONNECTED TO THE FIRST PRESSURE CHAMBER AND MOVABLE FROM A CLOSED POSITION HOLDING PRESSURE IN THE FIRST CHAMBER TO AN OPEN POSITION DISCHARGING PRESSURE FROM THE FIRST CHAMBER TO THE SUMP LINE, SPRING MEANS NORMALLY CLOSING THE PILOT VALVE, AND SOLENOID MEANS FOR OPENING THE PILOT VALVE.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |