US2965838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical logging system for exploring subsurface formations
Assignee: Texaco Inc
•
Filing: 1957-04-03
•
Granted: 1960-12-20
•
Expires: 1977-04-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Kister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:18
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2415364A
Cited
US2754475A
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US2669688A
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US2654064A
Cited
US2655632A
Cited
US2786178A
Cited
US2782364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |