US3371710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of surfactants in oil recovery
Assignee: Phillips Petroleum Co
•
Filing: 1965-03-25
•
Granted: 1968-03-05
•
Expires: 1985-03-25
Abstract
No abstract record available.
Inventors
- 👤 Robert R Harvey
- 👤 Thomas B Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:11
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2748080A
Cited
US2841222A
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US2882973A
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US3056452A
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US3087539A
Cited
US3175610A
Cited
US3208528A
Cited
US3160205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |