US3102592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrievable drill pipe plug
Assignee: Otis Engineering Corp
•
Filing: 1959-02-16
•
Granted: 1963-09-03
•
Expires: 1979-02-16
Abstract
No abstract record available.
Inventors
- 👤 William W Dollison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:27
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/06; Y; Y10; Y10S; Y10S285/00; Y10S285/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A PLUG FOR A WELL CONDUCTOR HAVING SPACED UPWARDLY AND DOWNWARDLY FACING INTERNAL SHOULDERS, INCLUDING: AN OUTER TUBULAR MEMBER HAVING A FIRST MEANS MOVABLE LATERALLY THEREON INTO EXPANDED POSITION FOR ENGAGING A DOWNWARDLY FACING SHOULDER OF THE WELL CONDUCTOR TO LIMIT UPWARD MOVEMENT OF THE PLUG IN THE WELL CONDUCTOR; A SECOND MEANS MOUNTED ON SAID OUTER TUBULAR MEMBER FOR LONGITUDINAL AND LATERAL MOVEMENT THEREON BETWEEN AN INNER POSITION AND A LATERALLY PROJECTING POSITION FOR ENGAGING AN UPWARDLY FACING SHOULDER OF A WELL CONDUCTOR FOR LIMITING DOWNWARD MOVEMENT OF THE WELL PLUG IN THE WELL CONDUCTOR; SAID SECOND MEANS BEING MOVABLE LONGITUDINALLY OF SAID OUTER TUBULAR MEMBER BETWEEN A POSITION IN WHICH SAID OUTER TUBULAR MEMBER ENGAGES AND HOLDS SAID SECOND MEANS IN POSITION FOR ENGAGING SAID UPWARDLY FACING SHOULDER AND A POSITION IN WHICH SAID SECOND MEANS IS MOVABLE LATERALLY INWARDLY OUT OF ENGAGING POSITION; AND AN INNER MEMBER MOUNTED IN SAID OUTER TUBULAR MEMBER FOR LIMITED LONGITUDINAL MOVEMENT THEREIN, SAID INNER MEMBER HAVING LOCKING MEANS THEREON MOVABLE INTO ENGAGEMENT WITH SAID FIRST MEANS FOR LOCKING SAID FIRST MEANS IN SAID EXPANDED POSITION.
Claim 2
Dependent Claim
184 words
A PLUG FOR A WELL CONDUCTOR HAVING SPACED UPWARDLY AND DOWNWARDLY FACING INTERNAL SHOULDERS, INCLUDING: AN OUTER TUBULAR MEMBER HAVING A FIRST MEANS MOVABLE LATERALLY THEREON INTO EXPANDED POSITION FOR ENGAGING A DOWNWARDLY FACING SHOULDER OF THE WELL CONDUCTOR TO LIMIT UPWARD MOVEMENT OF THE PLUG IN THE WELL CONDUCTOR; A SECOND MEANS MOUNTED ON SAID OUTER TUBULAR MEMBER FOR LONGITUDINAL AND LATERAL MOVEMENT THEREON BETWEEN AN INNER POSITION AND A LATERALLY PROJECTING POSITION FOR ENGAGING AN UPWARDLY FACING SHOULDER OF A WELL CONDUCTOR FOR LIMITING DOWNWARD MOVEMENT OF THE WELL PLUG IN THE WELL CONDUCTOR; SAID SECOND MEANS BEING MOVABLE LONGITUDINALLY OF SAID OUTER TUBULAR MEMBER BETWEEN A POSITION IN WHICH SAID OUTER TUBULAR MEMBER ENGAGES AND HOLDS SAID SECOND MEANS IN POSITION FOR ENGAGING SAID UPWARDLY FACING SHOULDER AND A POSITION IN WHICH SAID SECOND MEANS IS MOVABLE LATERALLY INWARDLY OUT OF ENGAGING POSITION; AND AN INNER MEMBER MOUNTED IN SAID OUTER TUBULAR MEMBER FOR LIMITED LONGITUDINAL MOVEMENT THEREIN, SAID INNER MEMBER HAVING LOCKING MEANS THEREON MOVABLE INTO ENGAGEMENT WITH SAID FIRST MEANS FOR LOCKING SAID FIRST MEANS IN SAID EXPANDED POSITION.
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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) | 1966-09-02 | 1967-03-04 | 1967-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-02 | 1971-03-04 | 1971-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-02 | 1975-03-04 | 1975-09-03 | $7700.00 | Window Closed / Lapsed |