Patent US2271951A successfully refreshed from Google Patents.
US2271951A
Expired / Lapsed
US
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Electrical prospecting method and apparatus
Assignee: Sperry Sun Well Surveying Co
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Filing: 1936-02-12
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Granted: 1942-02-03
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Expires: 1956-02-12
Abstract
No abstract record available.
Inventors
- 👤 John M Pearson
- 👤 George A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-02-02 | 1945-08-04 | 1946-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-02 | 1949-08-04 | 1950-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-02 | 1953-08-04 | 1954-02-03 | $7700.00 | Window Closed / Lapsed |