US3092135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Full opening safety valve for pipe strings
Assignee: Individual
•
Filing: 1956-04-27
•
Granted: 1963-06-04
•
Expires: 1976-04-27
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Brown
- 👤 Chudleigh B Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:12
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B2200/00; E21B2200/05; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/7722; Y10T137/7723; Y10T137/7725; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/777
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
144 words
A SAFETY VALVE FOR A PIPE STRING EXTENDING INTO A WELL, COMPRISING, A TUBULAR BODY ADAPTED TO FORM A PART OF A PIPE STRING WITHIN A WELL, MEANS FORMING AN ANNULAR VAVLE SEAT IN SAID BODY, A SLEEVE MEMBER SLIDABLE AXIALLY IN THE BORE OF THE BODY, A FLAPPER VALVE HINGED TO THE SIDE OF THE BODY ADJACENT SAID SEAT, MEANS PIVOTALLY CONNECTING THE VALVE TO THE SLEEVE MEMBER OPERATIVE BY RECIPROCATION OF THE SLEEVE MEMBER TO MOVE SAID VALVE BETWEEN OPEN AND CLOSED POSITIONS WITH RESPECT TO SAID SEAT, AND CONTROL MEANS OPERATIVE IN RESPONSE TO FLUID PRESSURE INSIDE SAID PIPE STRING WITHIN A PRE-DETERMINED RANGE TO APPLY SAID FLUID PRESSURE TO SAID SLEEVE MEMBER TO HOLD SAID SLEEVE MEMBER IN THE VALVE-OPENING POSITION, SAID CONTROL MEANS INCLUDING CONTROL ELEMENTS AUTOMATICALLY OPERABLE IN RESPONSE TO FLUID PRESSURES IN SAID PIPE STRING ABOVE AND
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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) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |