US3096825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve apparatus for drill pipes
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1960-09-19
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Granted: 1963-07-09
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Expires: 1980-09-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Earnest H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:52
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5153; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN APPARATUS OF THE CHARACTER DESCRIBED: A TUBULAR DRILLING STRING LOWERED THROUGH FLUID IN A WELL BORE AND EXTENDING TO THE TOP OF THE WELL BORE; A BODY MEMBER IN A LOWER PORTION OF SAID DRILLING STRING WHILE SAID DRILLING STRING IS LOWERED IN THE WELL BORE AND HAVING A PASSAGE THERETHROUGH; A VALVE MEMBER GREATER IN CROSS-SECTION THAN SAID PASSAGE AND DISPOSED INITIALLY BELOW SAID PASSAGE AND MOVABLE UPWARDLY INTO ENGAGEMENT WITH SAID BODY MEMBER TO PREVENT UPWARD FLOW OF WELL BORE FLUID THROUGH SAID PASSAGE DURING INITIAL LOWERING OF SAID DRILLING STRING THROUGH THE WELL BORE FLUID; ONE OF SAID MEMBERS BEING OF PLIANT, ELASTIC MATERIAL TO PERMIT SAID VALVE MEMBER TO BE
Claim 2
Dependent Claim
115 words
IN APPARATUS OF THE CHARACTER DESCRIBED: A TUBULAR DRILLING STRING LOWERED THROUGH FLUID IN A WELL BORE AND EXTENDING TO THE TOP OF THE WELL BORE; A BODY MEMBER IN A LOWER PORTION OF SAID DRILLING STRING WHILE SAID DRILLING STRING IS LOWERED IN THE WELL BORE AND HAVING A PASSAGE THERETHROUGH; A VALVE MEMBER GREATER IN CROSS-SECTION THAN SAID PASSAGE AND DISPOSED INITIALLY BELOW SAID PASSAGE AND MOVABLE UPWARDLY INTO ENGAGEMENT WITH SAID BODY MEMBER TO PREVENT UPWARD FLOW OF WELL BORE FLUID THROUGH SAID PASSAGE DURING INITIAL LOWERING OF SAID DRILLING STRING THROUGH THE WELL BORE FLUID; ONE OF SAID MEMBERS BEING OF PLIANT, ELASTIC MATERIAL TO PERMIT SAID VALVE MEMBER TO BE
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) | 1966-07-08 | 1967-01-07 | 1967-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-08 | 1971-01-07 | 1971-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-08 | 1975-01-07 | 1975-07-09 | $7700.00 | Window Closed / Lapsed |