US3288221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface safety valve
Assignee: Pan American Petroleum Corp
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Filing: 1964-03-06
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Granted: 1966-11-29
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Expires: 1984-03-06
Abstract
No abstract record available.
Inventors
- 👤 George C Howard
- 👤 Lawrence B Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:16
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1294; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7805
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A VALVE DEVICE COMPRISING: AN ELONGATED CENTRAL TUBULAR MEMBER ADAPTED TO BE CONNECTED INTO A STRING OF CONDUIT; AN ELONGATED OUTER TUBULAR MEMBER ENCASING SAID CENTRAL MEMBER; SAID OUTER MEMBER BEING RADIALLY SPACED FROM SAID CENTRAL MEMBER TO PROVIDE AN ANNULAR SPACE THEREBETWEEN, AND BEING SEALED TO SAID CENTRAL MEMBER IN A FLUID-TIGHT MANNER AT BOTH THE UPPER AND LOWER ENDS THEREOF; INLET PORT MEANS AND OUTLET PORT MEANS IN ONE OF SAID TUBULAR MEMBERS PLACING SAID ANNULAR SPACE IN FLOW COMMUNICATION WITH THE EXTERIOR OF SAID TUBULAR MEMBER, SAID PORT MEANS BEING SPACED APART ALONG THE LENGTH OF SAID TUBULAR MEMBER; VALVE SLEEVE MEANS SLIDABLY POSITIONED IN SAID ANNULAR SPACE TO MOVE BETWEEN AN OPEN POSITION AND A CLOSED POSITION TO MOVE BETWEEN AN OPEN POSITION AND A CLOSED SAID PORT MEANS;
Claim 2
Dependent Claim
133 words
A VALVE DEVICE COMPRISING: AN ELONGATED CENTRAL TUBULAR MEMBER ADAPTED TO BE CONNECTED INTO A STRING OF CONDUIT; AN ELONGATED OUTER TUBULAR MEMBER ENCASING SAID CENTRAL MEMBER; SAID OUTER MEMBER BEING RADIALLY SPACED FROM SAID CENTRAL MEMBER TO PROVIDE AN ANNULAR SPACE THEREBETWEEN, AND BEING SEALED TO SAID CENTRAL MEMBER IN A FLUID-TIGHT MANNER AT BOTH THE UPPER AND LOWER ENDS THEREOF; INLET PORT MEANS AND OUTLET PORT MEANS IN ONE OF SAID TUBULAR MEMBERS PLACING SAID ANNULAR SPACE IN FLOW COMMUNICATION WITH THE EXTERIOR OF SAID TUBULAR MEMBER, SAID PORT MEANS BEING SPACED APART ALONG THE LENGTH OF SAID TUBULAR MEMBER; VALVE SLEEVE MEANS SLIDABLY POSITIONED IN SAID ANNULAR SPACE TO MOVE BETWEEN AN OPEN POSITION AND A CLOSED POSITION TO MOVE BETWEEN AN OPEN POSITION AND A CLOSED SAID PORT MEANS;
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |