US3500175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic prospecting apparatus utilizing vlf radio fields
Assignee: Geonics Ltd
•
Filing: 1967-04-21
•
Granted: 1970-03-10
•
Expires: 1987-04-21
Abstract
No abstract record available.
Inventors
- 👤 Vaino Ronka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:26
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2268106A
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US2471105A
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US2558972A
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US2995699A
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US2929984A
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US3108220A
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US3085197A
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US3065407A
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US3214686A
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US3351852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |