US3216501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrievable safety valve
Assignee: Individual
•
Filing: 1961-05-26
•
Granted: 1965-11-09
•
Expires: 1981-05-26
Abstract
No abstract record available.
Inventors
- 👤 Jr John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:59
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A SHUT-OFF VALVE FOR WELLS, COMPRISING: AN ELONGATED HOUSING HAVING MEANS PROVIDING A BY-PASS PASSAGE; A SEAT IN SAID HOUSING; A VALVE INSERT; MEANS FOR RELEASABLY RETAINING SAID INSERT IN SAID SEAT; SAID INSERT INCLUDING A BODY; MEANS SEALING SAID INSERT BODY IN SAID SEAT; A VALVE MEMBER AT ONE SIDE OF SAID SEALING MEANS MOVABLE FROM A POSITION ALLOWING FLOW THROUGH SAID BYPASS PASSAGE TO A POTIION PREVENTING SUCH FLOW; MEANS SUPPORTING SAID VALVE MEMBER ON SAID BODY FOR SUCH MOVEMENT; MEANS INCLUDING FLUID PRESSURE RESPONSIVE SURFACES ON SAID MEMBER FOR MOVING SAID VALVE MEMBER TO SAID POSITIONS; AND SAID BODY HAVING MEANS INCLUDING A PASSAGE THERETHROUGH FOR ENABLING HYDRAULIC BALANCING OF SAID INSERT WHEN SAID BODY PASSAGE IS OPEN; AND CLOSURE MEANS PROVIDED FOR SELECTIVELY OPENING SAID BODY PASSAGE TO PERMIT SAID HYDRAULIC BALANCING TO OCCUR THROUGH SAID SEALING MEANS.
Claim 2
Dependent Claim
142 words
A SHUT-OFF VALVE FOR WELLS, COMPRISING: AN ELONGATED HOUSING HAVING MEANS PROVIDING A BY-PASS PASSAGE; A SEAT IN SAID HOUSING; A VALVE INSERT; MEANS FOR RELEASABLY RETAINING SAID INSERT IN SAID SEAT; SAID INSERT INCLUDING A BODY; MEANS SEALING SAID INSERT BODY IN SAID SEAT; A VALVE MEMBER AT ONE SIDE OF SAID SEALING MEANS MOVABLE FROM A POSITION ALLOWING FLOW THROUGH SAID BYPASS PASSAGE TO A POTIION PREVENTING SUCH FLOW; MEANS SUPPORTING SAID VALVE MEMBER ON SAID BODY FOR SUCH MOVEMENT; MEANS INCLUDING FLUID PRESSURE RESPONSIVE SURFACES ON SAID MEMBER FOR MOVING SAID VALVE MEMBER TO SAID POSITIONS; AND SAID BODY HAVING MEANS INCLUDING A PASSAGE THERETHROUGH FOR ENABLING HYDRAULIC BALANCING OF SAID INSERT WHEN SAID BODY PASSAGE IS OPEN; AND CLOSURE MEANS PROVIDED FOR SELECTIVELY OPENING SAID BODY PASSAGE TO PERMIT SAID HYDRAULIC BALANCING TO OCCUR THROUGH SAID SEALING MEANS.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |