Patent US1894328A successfully refreshed from Google Patents.
US1894328A
Expired / Lapsed
US
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Electrical device for the determination of specific resistivity
Assignee: Individual
•
Filing: 1932-07-02
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Granted: 1933-01-17
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Expires: 1952-07-02
Abstract
No abstract record available.
Inventors
- 👤 Schlumberger Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:58
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/22
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) | 1936-01-17 | 1936-07-18 | 1937-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-01-17 | 1940-07-18 | 1941-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-01-17 | 1944-07-18 | 1945-01-17 | $7700.00 | Window Closed / Lapsed |