Patent US2468658A successfully refreshed from Google Patents.
US2468658A
Expired / Lapsed
US
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Treatment of drilling fluids
Assignee: Individual
•
Filing: 1947-07-21
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Granted: 1949-04-26
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Expires: 1967-07-21
Abstract
No abstract record available.
Inventors
- 👤 Dyke Milton
- 👤 Samuel Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:23
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1819646A
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US1999766A
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US2369407A
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US2109858A
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US2209591A
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US2286835A
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US2380156A
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US2393574A
Cited
US2431891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-25 | 1952-10-25 | 1953-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-25 | 1956-10-25 | 1957-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-25 | 1960-10-25 | 1961-04-26 | $7700.00 | Window Closed / Lapsed |