US2760581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well completion tool
Assignee: Johnston Testers Inc
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Filing: 1954-02-05
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Granted: 1956-08-28
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Expires: 1974-02-05
Abstract
No abstract record available.
Inventors
- 👤 James L Johnston
- 👤 Aubrey C Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:38
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1294
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A WELL TOOL COMPRISING A HOUSING, AN OUTER TUBULAR MANDREL SLIDABLY RECEIVED WITHIN SAID HOUSING AND ADAPTED TO-BE ATTACHED AT ITS UPPER END TO A TUBING STRING, MEANS CONNECTING SAID OUTER MANDREL AND HOUSING FOR LIMITED LONGITUDINAL MOVEMENT IN EITHER DIRECTION RELATIVE TO EACH OTHER, A SLEEVE FIXED IN SAID HOUSING THROUGH WHICH SAID OUTER MANDREL EXTENDS, TEST PORTS IN SAID OUTER MANDREL ADAPTED TO BE CLOSED BY SAID SLEEVE WHEN SAID MANDREL IS IN ITS UPPER POSITION RELATIVE TO SAID HOUSING, AN INNER
Claim 2
Dependent Claim
84 words
A WELL TOOL COMPRISING A HOUSING, AN OUTER TUBULAR MANDREL SLIDABLY RECEIVED WITHIN SAID HOUSING AND ADAPTED TO-BE ATTACHED AT ITS UPPER END TO A TUBING STRING, MEANS CONNECTING SAID OUTER MANDREL AND HOUSING FOR LIMITED LONGITUDINAL MOVEMENT IN EITHER DIRECTION RELATIVE TO EACH OTHER, A SLEEVE FIXED IN SAID HOUSING THROUGH WHICH SAID OUTER MANDREL EXTENDS, TEST PORTS IN SAID OUTER MANDREL ADAPTED TO BE CLOSED BY SAID SLEEVE WHEN SAID MANDREL IS IN ITS UPPER POSITION RELATIVE TO SAID HOUSING, AN INNER
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) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |