Patent US2149510A successfully refreshed from Google Patents.
US2431487A
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US
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Oil detection in drilling muds
Assignee: NL Industries Inc
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Filing: 1942-06-22
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Granted: 1947-11-25
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Expires: 1962-06-22
Abstract
No abstract record available.
Inventors
- 👤 Delmar H Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:32
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2133280A
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US2173842A
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US2206922A
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US2213138A
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US2288942A
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US2263108A
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US2297939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |