Patent US3101741A successfully refreshed from Google Patents.
US3101741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot air operated valve
Assignee: Individual
•
Filing: 1961-04-12
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Granted: 1963-08-27
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Expires: 1981-04-12
Abstract
No abstract record available.
Inventors
- 👤 Walter D Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:14
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
IN A VALVE CONSTRUCTION HAVING A VALVE BODY DETACHABLY MOUNTED ON A BASE, THE COMBINATION OF, AN ANNULAR END CHAMBER IN EACH END OF SAID VALVE BODY; AN ELONGATED MASTER SPOOL SLIDABLY MOUNTED IN SAID VALVE BODY FOR CONTROLLING THE FLOW OF FLUID THROUGH THE VALVE; SAID MASTER SPOOL HAVING ENLARGED ENDS WHICH ARE SLIDABLY MOUNTED IN THE INNER ENDS OF THE ANNULAR END CHAMBERS SO AS TO SLIDABLY ENGAGE THE INTERIOR SURFACE THEREOF; A CUSHION RETAINER MOUNTED IN THE OUTER END OF EACH OF THE ANNULAR END CHAMBERS TO ENCLOSE THE OUTER ENDS THEREOF; A CUSHION MEMBER CARRIED ON THE INNER SIDE OF EACH OF SAID CUSHION RETAINERS; A CUSHION TRANSFER ELEMENT CARRIED ON EACH OF SAID CUSHIONS FOR STOOPING IMPACT WITH THE MASTER SPOOL WHEN IT IS SHIFTED FROM ONE END OF THE VALVE BODY TO THE OTHER, FOR TRANSFERRING THE STOPPING IMPACT OF THE MASTER SPOOL TO THE CUSHION; AND, MEANS FOR SELECTIVELY CONDUCTING PRESSURE FLUID INTO EACH OF SAID END CHAMBERS FOR SHIFTING SAID MASTER SPOOL.
Claim 2
Dependent Claim
170 words
IN A VALVE CONSTRUCTION HAVING A VALVE BODY DETACHABLY MOUNTED ON A BASE, THE COMBINATION OF, AN ANNULAR END CHAMBER IN EACH END OF SAID VALVE BODY; AN ELONGATED MASTER SPOOL SLIDABLY MOUNTED IN SAID VALVE BODY FOR CONTROLLING THE FLOW OF FLUID THROUGH THE VALVE; SAID MASTER SPOOL HAVING ENLARGED ENDS WHICH ARE SLIDABLY MOUNTED IN THE INNER ENDS OF THE ANNULAR END CHAMBERS SO AS TO SLIDABLY ENGAGE THE INTERIOR SURFACE THEREOF; A CUSHION RETAINER MOUNTED IN THE OUTER END OF EACH OF THE ANNULAR END CHAMBERS TO ENCLOSE THE OUTER ENDS THEREOF; A CUSHION MEMBER CARRIED ON THE INNER SIDE OF EACH OF SAID CUSHION RETAINERS; A CUSHION TRANSFER ELEMENT CARRIED ON EACH OF SAID CUSHIONS FOR STOOPING IMPACT WITH THE MASTER SPOOL WHEN IT IS SHIFTED FROM ONE END OF THE VALVE BODY TO THE OTHER, FOR TRANSFERRING THE STOPPING IMPACT OF THE MASTER SPOOL TO THE CUSHION; AND, MEANS FOR SELECTIVELY CONDUCTING PRESSURE FLUID INTO EACH OF SAID END CHAMBERS FOR SHIFTING SAID MASTER SPOOL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |