Patent US3495212A successfully refreshed from Google Patents.
US3495212A
Expired / Lapsed
US
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Methods and apparatus for detecting the sudden movement of a tool in a well
Assignee: Schlumberger Technology Corp
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Filing: 1968-09-05
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Granted: 1970-02-10
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Expires: 1988-09-05
Abstract
No abstract record available.
Inventors
- 👤 George W Brock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:21
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/1185; E21B43/11857; G; G01; G01V; G01V1/00; G01V1/40; G01V1/44
Claims Analysis
Total Claims: 0
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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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |