US3107726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of oil from tar sands and other oil-bearing formations
Assignee: Rohm and Haas Co
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Filing: 1961-02-03
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Granted: 1963-10-22
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Expires: 1981-02-03
Abstract
No abstract record available.
Inventors
- 👤 Harold L Greenwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:39
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE PROCESS OF RECOVERING OIL FROM AN OIL-BEARING FORMATION WHICH COMPRISES INTRODUCING THEREUNTO THROUGH AN INJECTION WELL AN ALKALINE AQUEOUS SOLUTION OF A PHSENSITIVE SURFACTANT SO AS TO FORM AN OIL-WATER EMULSION IN THE WELL, THE SURFACTANT BEING SELECTED FROM THE CLASS CONSISTING OF (A) THE ETHYLENE OXIDE ADDUCTS OF A RANGE OF AMINES REPRESENTED BY THE FORMULA C11-24H23-49NH2 WHERE THE NUMBER OF ETHYLENE OXIDE UNITS IS FROM 5 TO 50 PER AMINE; (B) C11-24H23-49NH(C2H4O)NSO4NA WHERE N=3 TO 50; AND (C)
Claim 2
Dependent Claim
81 words
THE PROCESS OF RECOVERING OIL FROM AN OIL-BEARING FORMATION WHICH COMPRISES INTRODUCING THEREUNTO THROUGH AN INJECTION WELL AN ALKALINE AQUEOUS SOLUTION OF A PHSENSITIVE SURFACTANT SO AS TO FORM AN OIL-WATER EMULSION IN THE WELL, THE SURFACTANT BEING SELECTED FROM THE CLASS CONSISTING OF (A) THE ETHYLENE OXIDE ADDUCTS OF A RANGE OF AMINES REPRESENTED BY THE FORMULA C11-24H23-49NH2 WHERE THE NUMBER OF ETHYLENE OXIDE UNITS IS FROM 5 TO 50 PER AMINE; (B) C11-24H23-49NH(C2H4O)NSO4NA WHERE N=3 TO 50; AND (C)
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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |