US3090442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for supporting a closure within a well pipe
Assignee: Individual
•
Filing: 1958-10-24
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Granted: 1963-05-21
•
Expires: 1978-10-24
Abstract
No abstract record available.
Inventors
- 👤 Chudleigh B Cochran
- 👤 James D Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:58
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/08; E21B23/04; E21B23/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PLUG FOR CLOSING THE LOWER EN D OF A TUBING COMPRISING, A MANDREL, MOVABLE DOG MEANS CARRIED BY THE MANDREL, MEANS MOUNTED ON THE MANDREL HOLDING THE DOG MEANS IN EXTENDED POSITION, A RELEASABLE CONNECTION BETWEEN SAID HOLDING MEANS AND SAID MANDREL, MEANS INCLUDING PRESSURE RESPONSIVE MEANS RELEASING SAID RELEASABLE CONNECTION UPON BEING SUBJECTED TO A PREDETERMINED PRESSURE, AND PRESSURE OPERATED MEANS PREVENTING THE HOLDING MEANS FROM RELEASING THE DOG MEANS UNTIL SAID PREDETERMINED PRESSURE HAS BEEN REDUCED TO A SECOND PREDETERMINED PRESSURE.
Claim 2
Dependent Claim
84 words
A PLUG FOR CLOSING THE LOWER EN D OF A TUBING COMPRISING, A MANDREL, MOVABLE DOG MEANS CARRIED BY THE MANDREL, MEANS MOUNTED ON THE MANDREL HOLDING THE DOG MEANS IN EXTENDED POSITION, A RELEASABLE CONNECTION BETWEEN SAID HOLDING MEANS AND SAID MANDREL, MEANS INCLUDING PRESSURE RESPONSIVE MEANS RELEASING SAID RELEASABLE CONNECTION UPON BEING SUBJECTED TO A PREDETERMINED PRESSURE, AND PRESSURE OPERATED MEANS PREVENTING THE HOLDING MEANS FROM RELEASING THE DOG MEANS UNTIL SAID PREDETERMINED PRESSURE HAS BEEN REDUCED TO A SECOND PREDETERMINED 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) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |