US3548304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistivity measuring device having vertically-spaced ring electrode and a central electrode
Assignee: Iowa State University Research Foundation Inc
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Filing: 1967-12-05
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Granted: 1970-12-15
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Expires: 1987-12-05
Abstract
No abstract record available.
Inventors
- 👤 Robert A Lohnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:12
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/02; G01V3/04; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2083074A
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US2379106A
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US2461111A
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US2782364A
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US2922103A
Cited
US3051893A
Cited
GB959046A
Cited
US3370466A
Cited
US3327968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |