US2750958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill pipe float valve
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1953-04-27
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Granted: 1956-06-19
•
Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
- 👤 Charles M King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:14
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7857; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7932; Y10T137/7933; Y10T137/7934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
IN A DRILL PIPE FLOAT VALVE: A VALVE BODY HAVING A METALLIC VALVE SEAT; A METALLIC VALVE HEAD MOVABLE UPWARDLY INTO ENGAGEMENT WITH SAID SEAT, SAID VALVE HEAD ENGAGING SAID SEAT ONLY ALONG SUBSTANTIALLY A CIRCUMFERENTIAL LINE OF CONTACT; SAID BODY HAVING A CENTRAL HUB PORTION BELOW SAID HEAD; A SEPARATE VALVE GUIDE REMOVABLY MOUNTED IN SAID HUB PORTION AND HAVING A FLANGE ENGAGING ONE END OF SAID HUB PORTION TO PREVENT LONGITUDINAL MOVEMENT OF SAID GUIDE IN ONE DIRECTION; RETAINING MEANS ON SAID GUIDE ENGAGING THE OTHER END OF SAID HUB PORTION TO PREVENT LONGITUDINAL MOVEMENT OF SAID GUIDE IN THE OPPOSITE DIRECTION; A VALVE STEM SECURED TO AND DEPENDING FROM SAID HEAD AND SLIDABLE IN SAID GUIDE; AND SPRING MEANS SURROUNDING SAID STEM AND ENGAGING SAID HEAD AND GUIDE TO URGE SAID HEAD TOWARD ENGAGEMENT WITH SAID STEM, THE FORCE EXERTED BY SAID SPRING MEANS UPON SAID VALVE HEAD WHEN IT ENGAGES SAID SEAT BEING ONLY SLIGHTLY GREATER THAN THE COMBINED WEIGHTS OF SAID VALVE HEAD AND STEM, WHEREBY SAID VALVE HEAD MOVES DOWNWARDLY TO A FULLY OPEN POSITION WHEN A VERY LOW FLUID PRESSURE IS IMPOSED THEREON.
Claim 2
Dependent Claim
190 words
IN A DRILL PIPE FLOAT VALVE: A VALVE BODY HAVING A METALLIC VALVE SEAT; A METALLIC VALVE HEAD MOVABLE UPWARDLY INTO ENGAGEMENT WITH SAID SEAT, SAID VALVE HEAD ENGAGING SAID SEAT ONLY ALONG SUBSTANTIALLY A CIRCUMFERENTIAL LINE OF CONTACT; SAID BODY HAVING A CENTRAL HUB PORTION BELOW SAID HEAD; A SEPARATE VALVE GUIDE REMOVABLY MOUNTED IN SAID HUB PORTION AND HAVING A FLANGE ENGAGING ONE END OF SAID HUB PORTION TO PREVENT LONGITUDINAL MOVEMENT OF SAID GUIDE IN ONE DIRECTION; RETAINING MEANS ON SAID GUIDE ENGAGING THE OTHER END OF SAID HUB PORTION TO PREVENT LONGITUDINAL MOVEMENT OF SAID GUIDE IN THE OPPOSITE DIRECTION; A VALVE STEM SECURED TO AND DEPENDING FROM SAID HEAD AND SLIDABLE IN SAID GUIDE; AND SPRING MEANS SURROUNDING SAID STEM AND ENGAGING SAID HEAD AND GUIDE TO URGE SAID HEAD TOWARD ENGAGEMENT WITH SAID STEM, THE FORCE EXERTED BY SAID SPRING MEANS UPON SAID VALVE HEAD WHEN IT ENGAGES SAID SEAT BEING ONLY SLIGHTLY GREATER THAN THE COMBINED WEIGHTS OF SAID VALVE HEAD AND STEM, WHEREBY SAID VALVE HEAD MOVES DOWNWARDLY TO A FULLY OPEN POSITION WHEN A VERY LOW FLUID PRESSURE IS IMPOSED THEREON.
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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) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |