US3265134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well safety valve
Assignee: Camco Inc
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Filing: 1964-02-03
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Granted: 1966-08-09
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Expires: 1984-02-03
Abstract
No abstract record available.
Inventors
- 👤 Gilbert H Tausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; E21B2200/00; E21B2200/05; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727; Y10T137/7781; Y10T137/7784; Y10T137/7785
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
144 words
A WELL TUBING SAFETY VALVE COMPRISING AN OUTER TUBULAR MEMBER FOR CONNECTION IN A WELL TUBING STRING, A DOWNWARDLY FACING ANNULAR VALVE SEAT CARRIED BY SAID MEMBER, A VALVE MOVABLY MOUNTED BY SAID MEMBER FOR UPWARD TRAVEL INTO CLOSING ENGAGEMENT WITH SAID SEAT, AN INNER TUBE SLIDABLY FITTED TO SAID MEMBER FOR AXIAL MOVEMENT FROM ONE POSITION IN WHICH THE TUBE IS WHOLLY ABOVE SAID SEAT AND ANOTHER POSITION IN WHICH A TUBE PORTION IS BELOW SAID SEAT AND BLOCKS VALVE CLOSING MOVEMENT, MEANS ON THE TUBE RESPONSIVE TO TUBING STRING FLUID PRESSURE DOWNSTREAM OF THE TUBE FOR URGING THE TUBE INTO ITS LAST MENTIONED POSITION, SPRING MEANS INTERPOSED UNDER COMPRESSION BETWEEN THE MEMBER AND THE TUBE FOR BIASING THE TUBE IN OPPOSITION TO SAID DOWNSTREAM FLUID PRESSURE AND A SPRING ENCLOSING CHAMBER SEALED AT ATMOSPHERIC PRESSURE BETWEEN THE MEMBER AND THE SLIDABLE TUBE.
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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |