Patent US2961539A successfully refreshed from Google Patents.
US2961539A
Expired / Lapsed
US
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Productivity well logging
Assignee: Texaco Inc
•
Filing: 1955-11-14
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Granted: 1960-11-22
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Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Edmond F Egan
- 👤 Herzog Gerhard
- 👤 Joseph C Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:35
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735944A
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US2289926A
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US2273215A
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US2378219A
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US2522522A
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US2316239A
Cited
US2670442A
Cited
US2722609A
Cited
US2725486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |