US3216731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tools
Assignee: Otis Engineering Corp
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Filing: 1962-02-12
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Granted: 1965-11-09
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Expires: 1982-02-12
Abstract
No abstract record available.
Inventors
- 👤 William W Dollison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:36
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; Y; Y10; Y10S; Y10S277/00; Y10S277/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A WELL TOOL INCLUDING: A TUBULAR MEMBER HAVING A BORE; A PLURALITY OF TUBULAR SEALING ELEMENTS DISPOSED ON SAID TUBULAR MEMBER IN LONGITUDINALLY SPACED RELATION, SAID SEALING ELEMENTS BEING ENGAGEABLE WITH AN ELONGATE MEMBER MOVABLE THROUGH SAID TUBULAR MEMBER AND SEALING THEREBETWEEN TO PROVIDE A PLURALITY OF LONGITUDINALLY SPACED CHAMBERS BETWEEN EACH ADJACENT PAIR OF SEALING ELEMENTS; AND MEANS PROVIDING FOR FLOW OF FLUID FROM THE BORE OF THE TUBULAR MEMBER AT A POINT UPSTREAM OF ONE END SEALING ELEMENT EXTERIORLY OF THE SEALING ELEMENTS AND BACK INTO THE TUBULAR MEMBER INTO THE CHAMBERS BETWEEN SAID SEALING MEANS, SAID LAST MENTIONED MEANS IN-
Claim 2
Dependent Claim
103 words
A WELL TOOL INCLUDING: A TUBULAR MEMBER HAVING A BORE; A PLURALITY OF TUBULAR SEALING ELEMENTS DISPOSED ON SAID TUBULAR MEMBER IN LONGITUDINALLY SPACED RELATION, SAID SEALING ELEMENTS BEING ENGAGEABLE WITH AN ELONGATE MEMBER MOVABLE THROUGH SAID TUBULAR MEMBER AND SEALING THEREBETWEEN TO PROVIDE A PLURALITY OF LONGITUDINALLY SPACED CHAMBERS BETWEEN EACH ADJACENT PAIR OF SEALING ELEMENTS; AND MEANS PROVIDING FOR FLOW OF FLUID FROM THE BORE OF THE TUBULAR MEMBER AT A POINT UPSTREAM OF ONE END SEALING ELEMENT EXTERIORLY OF THE SEALING ELEMENTS AND BACK INTO THE TUBULAR MEMBER INTO THE CHAMBERS BETWEEN SAID SEALING MEANS, SAID LAST MENTIONED MEANS IN-
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) | 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 |