Patent US2585907A successfully refreshed from Google Patents.
US2585907A
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Transmitting and receiving apparatus for electromagnetic prospecting
Assignee: ENGINEERING RES CORP
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Filing: 1947-06-26
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Granted: 1952-02-19
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Expires: 1967-06-26
Abstract
No abstract record available.
Inventors
- 👤 William M Barret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:27
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1322622A
Cited
US1220005A
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US1349103A
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US1557049A
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US1303730A
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US1530129A
Cited
US2333990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |