US2475485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of drilling fluids
Assignee: Oil Well Chemical and Materials Co
•
Filing: 1948-12-15
•
Granted: 1949-07-05
•
Expires: 1968-12-15
Abstract
No abstract record available.
Inventors
- 👤 Dyke Milton
- 👤 Self Edward Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:38
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)
US1833772A
Cited
US1819646A
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US2065762A
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US1964641A
Cited
US2109858A
Cited
US2209591A
Cited
US2286835A
Cited
US2430039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |