Patent US2118174A successfully refreshed from Google Patents.
US3136339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary 3-way helical valve
Assignee: PICKFORD EXPERIMENTAL CO Ltd
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Filing: 1961-04-19
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Granted: 1964-06-09
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Expires: 1981-04-19
Abstract
No abstract record available.
Inventors
- 👤 Champion Cuthbert Llewellyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:20
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/10; F16K11/20; F16K11/202; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86815; Y10T137/86823; Y10T137/86863; Y10T137/87096; Y10T137/87121; Y10T137/87129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A VALVE COMPRISING A VALVE CHAMBER OF CIRCULAR CROSS-SECTION ABOUT AN AXIS HAVING A COMMON PORT FORMED IN ITS CIRCUMFERENTIAL WALL, AND A VALVE MEMBER DISPOSED WITHIN THE CHAMBER FOR ROTATION ABOUT SAID AXIS AND HAVING A HELICAL CONTROLLING EDGE WHICH LIES ADJACENT TO OR IN CONTACT WITH THE CIRCUMFERENTIAL WALL OF THE VALVE CHAMBER AND EXTENDS ACROSS THE COMMON PORT TO DIVIDE THIS PORT INTO TWO PARTS WHICH RESPECTIVELY COMMUNICATE WITH PARTS OF THE VALVE CHAMBER WHICH LIES ON OPPOSITE SIDES OF SAID HELICAL EDGE AND ARE CLOSED EXCEPT THAT EACH HAS ASSOCIATED AND COMMUNICATING WITH IT ONE FURTHER FLOW PASSAGE, THE OPPOSITE ENDS OF THE HELICAL EDGE BEING UNITED BY A BARRIER PART THE EDGE OF WHICH ALSO LIES ADJACENT TO OR IN CONTACT WITH THE CIRCUMFERENTIAL WALL OF THE VALVE CHAMBER SO AS TO COOPERATE WITH THE HELICAL EDGE IN PREVENTING COMMUNICATION BETWEEN THE SAID TWO PARTS OF THE VALVE CHAMBER.
Claim 2
Dependent Claim
154 words
A VALVE COMPRISING A VALVE CHAMBER OF CIRCULAR CROSS-SECTION ABOUT AN AXIS HAVING A COMMON PORT FORMED IN ITS CIRCUMFERENTIAL WALL, AND A VALVE MEMBER DISPOSED WITHIN THE CHAMBER FOR ROTATION ABOUT SAID AXIS AND HAVING A HELICAL CONTROLLING EDGE WHICH LIES ADJACENT TO OR IN CONTACT WITH THE CIRCUMFERENTIAL WALL OF THE VALVE CHAMBER AND EXTENDS ACROSS THE COMMON PORT TO DIVIDE THIS PORT INTO TWO PARTS WHICH RESPECTIVELY COMMUNICATE WITH PARTS OF THE VALVE CHAMBER WHICH LIES ON OPPOSITE SIDES OF SAID HELICAL EDGE AND ARE CLOSED EXCEPT THAT EACH HAS ASSOCIATED AND COMMUNICATING WITH IT ONE FURTHER FLOW PASSAGE, THE OPPOSITE ENDS OF THE HELICAL EDGE BEING UNITED BY A BARRIER PART THE EDGE OF WHICH ALSO LIES ADJACENT TO OR IN CONTACT WITH THE CIRCUMFERENTIAL WALL OF THE VALVE CHAMBER SO AS TO COOPERATE WITH THE HELICAL EDGE IN PREVENTING COMMUNICATION BETWEEN THE SAID TWO PARTS OF THE VALVE CHAMBER.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |