US2640869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated susceptibility logging system
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1950-06-03
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Granted: 1953-06-02
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Expires: 1970-06-03
Abstract
No abstract record available.
Inventors
- 👤 Carl W Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1479087A
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US2377496A
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US1089030A
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US1379266A
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US1601383A
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US2083387A
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US2274013A
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US2370609A
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US2535666A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |