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US3400327A
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US
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Borehole tool rotational switching system controlled by detector of earth's magnetic field
Assignee: Mobil Oil AS
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Filing: 1966-02-23
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Granted: 1968-09-03
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Expires: 1986-02-23
Abstract
No abstract record available.
Inventors
- 👤 James H Sexton
- 👤 Bobbie J Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:40
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2300823A
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US2370818A
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US2958821A
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US2940039A
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US2958511A
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US3032127A
Cited
US3297948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |