Patent US3904042A successfully refreshed from Google Patents.
US3292718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic kelly valve
Assignee: Gulf Oil Corp
•
Filing: 1963-01-29
•
Granted: 1966-12-20
•
Expires: 1983-01-29
Abstract
No abstract record available.
Inventors
- 👤 Virgil D Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:42
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B21/106; E21B17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A SELF-ACTING VALVE FOR CONNECTION BETWEEN A KELLY AND DRILL PIPE OF ROTARY DRILLING APPARATUS, SAID VALVE ADAPTED TO RESPOND AUTOMATICALLY TO CHANGES IN FLUID PRESSURE OF A DRILLING FLUID CONTAINED IN THE VALVE AND COMPRISING A TUBULAR OUTER CASING FORMING A SMOOTH EVEN SURFACE BETWEEN THE KELLY AND THE DRILL PIPE, SAID CASING BEING THREADED AT EACH END FOR CONNECTION TO THE KELLY AND THE DRILL PIPE, A TUBE EXTENDING LONGITUDINALLY WITHIN THE CASING AND COMMUNICATING WITH THE KELLY AND THE DRILL PIPE AND HAVING A FLEXIBLE CENTER PORTION, THE OUTER DIAMETER OF THE TUBE BEING SMALLER THAN THE INNER DIAMETER OF THE CASING TO FORM A CHAMBER TOTALLY ENCLOSED BETWEEN THE TUBE AND THE CASING, AND A GAS SEALED WITHIN THE CHAMBER, AT A PRESSURE ADAPTED TO CONSTRICT THE FLEXIBLE PORTION OF THE TUBE WHEN CIRCULATION OF THE DRILLING FLUID THERETHROUGH IS STOPPED.
Claim 2
Dependent Claim
145 words
A SELF-ACTING VALVE FOR CONNECTION BETWEEN A KELLY AND DRILL PIPE OF ROTARY DRILLING APPARATUS, SAID VALVE ADAPTED TO RESPOND AUTOMATICALLY TO CHANGES IN FLUID PRESSURE OF A DRILLING FLUID CONTAINED IN THE VALVE AND COMPRISING A TUBULAR OUTER CASING FORMING A SMOOTH EVEN SURFACE BETWEEN THE KELLY AND THE DRILL PIPE, SAID CASING BEING THREADED AT EACH END FOR CONNECTION TO THE KELLY AND THE DRILL PIPE, A TUBE EXTENDING LONGITUDINALLY WITHIN THE CASING AND COMMUNICATING WITH THE KELLY AND THE DRILL PIPE AND HAVING A FLEXIBLE CENTER PORTION, THE OUTER DIAMETER OF THE TUBE BEING SMALLER THAN THE INNER DIAMETER OF THE CASING TO FORM A CHAMBER TOTALLY ENCLOSED BETWEEN THE TUBE AND THE CASING, AND A GAS SEALED WITHIN THE CHAMBER, AT A PRESSURE ADAPTED TO CONSTRICT THE FLEXIBLE PORTION OF THE TUBE WHEN CIRCULATION OF THE DRILLING FLUID THERETHROUGH IS STOPPED.
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) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |