US3131722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Ross Operating Valve Co
•
Filing: 1961-11-27
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Granted: 1964-05-05
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Expires: 1981-11-27
Abstract
No abstract record available.
Inventors
- 👤 Daniel B Abbott
- 👤 Edwin P Brinkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:57
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/048; F16K11/06; F16K11/065; F16K11/07; F16K31/00; F16K31/12; F16K31/36; F16K31/363; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86622; Y10T137/8663; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
IN COMBINATION, A VALVE SPOOL, A VALVE BODY SLIDABLY SUPPORTING SAID SPOOL, A FIRST SEAL ON SAID SPOOL FORMING A SIGNAL CHAMBER IN SAID BODY AT ONE END OF THE SPOOL, ANLET CHAMBER FORMED AT THE OTHER END OF SAID SPOOL AND CONNECTABLE TO A SOURCE OF CONSTANT PRESSURE, A WORKING CHAMBER BETWEEN SAID INLET AND SIGNAL CHAMBERS, A SEAL FORMING AN INLET VALVE BETWEEN SAID INLET AND WORKING CHAMBERS, THE EFFECTIVE SEAL AREA OF SAID INLET VALVE BEING LESS THAN THE EFFECTIVE SEAL AREA OF SAID FIRST SEAL, AN EXHAUST CHAMBER BETWEEN SAID WORKING CHAMBER AND SIGNAL CHAMBER, A SEAL FORMING AN EXHAUST VALVE ON SAID SPOOL BETWEEN SAID WORKING AND EXHAUST CHAMBERS, THE EFFECTIVE AREA OF SAID EXHAUST VALVE BEING LESS THAN THE EFFECTIVE AREA OF SAID INLET VALVE, A SIGNAL VALVE CONNECTED TO SAID SIGNAL CHAMBER AND MOVABLE BETWEEN SUPPLY AND EXHAUST POSI-
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |