US3106932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve apparatus
Assignee: Halliburton Co
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Filing: 1961-03-31
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Granted: 1963-10-15
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Expires: 1981-03-31
Abstract
No abstract record available.
Inventors
- 👤 Pat T W Chisholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:15
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669; Y10T137/7504
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A CHECK VALVE FOR USE IN OIL WELL TESTING STRINGS OR THE LIKE COMPRISING: A GENERALLY TUBULAR BODY, FIRST COUPLING MEANS AT ONE END OF SAID BODY FOR ENGAGING PIPE MEANS EXTENDING BELOW SAID BODY, SECOND COUPLING MEANS AT THE OTHER END OF SAID BODY FOR ENGAGING PIPE MEANS EXTENDING ABOVE SAID BODY, A CHECK VALVE ASSEMBLY AXIALLY ALIGNED WITH SAID TELESCOPINGLY RECEIVED WITHIN SAID BODY, SAID CHECK VALVE ASSEMBLY BEING REMOVABLE FROM EITHER END OF SAID BODY, RETAINING MEANS OPERABLY CONNECTING SAID BODY AND VALVE ASSEMBLY FOR PREVENTING AXIAL MOVEMENT OF SAID VALVE ASSEMBLY WITHIN SAID BODY, A SLEEVE WITHIN SAID CHECK VALVE ASSEMBLY ADAPTED TO HOLD SAID RETAINING MEANS IN OPERABLE POSITION, A VALVE SEAT IN SAID ASSEMBLY FACING UPWARDLY, A VALVE HEAD IN SAID ASSEMBLY ABOVE SAID VALVE SEAT AND MOVABLE DOWNWARDLY AND AXIALLY OF SAID ASSEMBLY TO ENGAGE SAID SEAT IN RESPONSE TO FLUID PRESSURE ABOVE SAID VALVE HEAD AND MOVABLE UPWARDLY AND AXIALLY OF SAID ASSEMBLY AWAY FROM SAID SEAT IN RESPONSE TO FLUID PRESSURE BELOW SAID VALVE HEAD,
Claim 2
Dependent Claim
174 words
A CHECK VALVE FOR USE IN OIL WELL TESTING STRINGS OR THE LIKE COMPRISING: A GENERALLY TUBULAR BODY, FIRST COUPLING MEANS AT ONE END OF SAID BODY FOR ENGAGING PIPE MEANS EXTENDING BELOW SAID BODY, SECOND COUPLING MEANS AT THE OTHER END OF SAID BODY FOR ENGAGING PIPE MEANS EXTENDING ABOVE SAID BODY, A CHECK VALVE ASSEMBLY AXIALLY ALIGNED WITH SAID TELESCOPINGLY RECEIVED WITHIN SAID BODY, SAID CHECK VALVE ASSEMBLY BEING REMOVABLE FROM EITHER END OF SAID BODY, RETAINING MEANS OPERABLY CONNECTING SAID BODY AND VALVE ASSEMBLY FOR PREVENTING AXIAL MOVEMENT OF SAID VALVE ASSEMBLY WITHIN SAID BODY, A SLEEVE WITHIN SAID CHECK VALVE ASSEMBLY ADAPTED TO HOLD SAID RETAINING MEANS IN OPERABLE POSITION, A VALVE SEAT IN SAID ASSEMBLY FACING UPWARDLY, A VALVE HEAD IN SAID ASSEMBLY ABOVE SAID VALVE SEAT AND MOVABLE DOWNWARDLY AND AXIALLY OF SAID ASSEMBLY TO ENGAGE SAID SEAT IN RESPONSE TO FLUID PRESSURE ABOVE SAID VALVE HEAD AND MOVABLE UPWARDLY AND AXIALLY OF SAID ASSEMBLY AWAY FROM SAID SEAT IN RESPONSE TO FLUID PRESSURE BELOW SAID VALVE HEAD,
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) | 1966-10-14 | 1967-04-15 | 1967-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-14 | 1971-04-15 | 1971-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-14 | 1975-04-15 | 1975-10-15 | $7700.00 | Window Closed / Lapsed |