US3476187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil recovery with a drive comprising surfactants and minute solids
Assignee: Phillips Petroleum Co
•
Filing: 1968-03-25
•
Granted: 1969-11-04
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Expires: 1988-03-25
Abstract
No abstract record available.
Inventors
- 👤 Robert R Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:13
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/92
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3412792A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |