Patent US3479287A successfully refreshed from Google Patents.
US3479287A
Expired / Lapsed
US
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Drilling fluids and additives therefor
Assignee: Phillips Petroleum Co
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Filing: 1965-09-30
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Granted: 1969-11-18
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Expires: 1985-09-30
Abstract
No abstract record available.
Inventors
- 👤 James C Floyd
- 👤 Francis J Shell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/28; C09K8/14; C09K8/18; C09K8/20; C09K8/203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |