US3393732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for locating tension failures in oil well casings
Assignee: Shell USA Inc
•
Filing: 1965-05-21
•
Granted: 1968-07-23
•
Expires: 1985-05-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Carey E Murphey
- 👤 Maurice M Patterson
- 👤 Bascom C Sheffield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:30
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; E; E21; E21B; E21B47/00; E21B47/09; E21B47/092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2246542A
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US2250703A
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US2228623A
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US2553350A
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US2698920A
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US2717039A
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US3091733A
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US2902094A
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US3114876A
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US3163487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |