US3014177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic earth surveying apparatus
Assignee: Shell USA Inc
•
Filing: 1957-06-24
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Granted: 1961-12-19
•
Expires: 1977-06-24
Abstract
No abstract record available.
Inventors
- 👤 Ernest T Hungerford
- 👤 Charles H Fay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:11
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/026; G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1980100A
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US2291692A
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US2359894A
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US2401280A
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US2564018A
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US2674049A
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US2611190A
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US2766426A
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US2687507A
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US2723374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |