Patent US3363581A successfully refreshed from Google Patents.
US3363581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas lift valve
Assignee: EARL G BLAKE
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Filing: 1966-05-16
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Granted: 1968-01-16
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Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Kelley Kork
- 👤 Robert K Kelley
- 👤 Earl G Blake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:48
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A GAS LIFT VALVE ADAPTED FOR CONNECTION TO A WELL TUBING STRING COMPRISING, AN ELEMENT HAVING A PASSAGE THEREIN AND A VALVE SEAT IN SAID PASSAGE, A VALVE MEMBER MOUNTED FOR AXIAL MOVEMENT BETWEEN AN OPEN AND CLOSED POSITION IN SAID SEAT, VALVE CLOSING MEANS COMPRISING A FIRST BELLOWS MEANS OPERATIVELY CONNECTED TO SAID VALVE MEMBER FOR URGING IT TOWARD THE CLOSED POSITION WITH A PREDETERMINED FORCE, AND VALVE OPENING MEANS COMPRISING A SECOND BELLOWS MEANS OPERATIVELY CONNECTED TO SAID VALVE MEMBER FOR URGING IT TOWARD THE OPEN POSITION IN RESPONSE TO DIFFERENTIAL FLUID PRESSURE.
Claim 2
Dependent Claim
95 words
A GAS LIFT VALVE ADAPTED FOR CONNECTION TO A WELL TUBING STRING COMPRISING, AN ELEMENT HAVING A PASSAGE THEREIN AND A VALVE SEAT IN SAID PASSAGE, A VALVE MEMBER MOUNTED FOR AXIAL MOVEMENT BETWEEN AN OPEN AND CLOSED POSITION IN SAID SEAT, VALVE CLOSING MEANS COMPRISING A FIRST BELLOWS MEANS OPERATIVELY CONNECTED TO SAID VALVE MEMBER FOR URGING IT TOWARD THE CLOSED POSITION WITH A PREDETERMINED FORCE, AND VALVE OPENING MEANS COMPRISING A SECOND BELLOWS MEANS OPERATIVELY CONNECTED TO SAID VALVE MEMBER FOR URGING IT TOWARD THE OPEN POSITION IN RESPONSE TO DIFFERENTIAL FLUID PRESSURE.
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) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |