Patent US3468377A successfully refreshed from Google Patents.
US3468377A
Expired / Lapsed
US
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Waterflooding employing surfactant solution
Assignee: Mobil Oil AS
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Filing: 1967-10-09
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Granted: 1969-09-23
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Expires: 1987-10-09
Abstract
No abstract record available.
Inventors
- 👤 Peggy M Dunlap
- 👤 William R Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:20
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
IT IS PARTICULARLY PREFERRED TO EMPLOY A RESTRICTED MIXTURE OF PETROLEUM SULFONATES HAVING A MEDIAN MOLECULAR WEIGHT OF FROM ABOUT 400 TO ABOUT 430, AND HAVING A SMOOTH MONOMODAL CURVE OF MOLECULAR WEIGHT DISTRIBUTION BETWEEN AVERAGE MOLECULAR WEIGHTS OF ABOUT 290 AND 590. THE SOLUTION MAY BE AQUEOUS OR HYDROCARBONACEOUS. PREFERABLY, THE MIXTURE OF PETROLEUM SULFONATES IS INJECTED IN AN AQUEOUS SOLUTION WHICH ALSO CONTAINS SODIUM CHLORIDE, SODIUM CARBONATE, AND INORGANIC POLYPHOSPHATES.
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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) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |