US2568583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating impurities from used lubricating oils
Assignee: Dow Chemical Co
•
Filing: 1949-06-18
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Granted: 1951-09-18
•
Expires: 1969-06-18
Abstract
No abstract record available.
Inventors
- 👤 Eldon F Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:09
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD OF SEPARATING DISPERSED IMPURITIES FROM USED LUBRICATING OIL WHICH COMPRISES, DISSOLVING IN THE OIL A MINOR BUT EFFECTIVE PROPORTION OF AN N-PHENYL ALKYLOL AMINE SELECTED FROM THE GROUP CONSISTING OF N-PHENYL ETHANOLAMINE, NPHENYL DIETHANOLAMINE, AND N-PHENYL ETHANOLISOPROPANOLAMINE SUFFICIENT TO CAUSE AGGREGATION OF THE IMPURITICS AND THEREAFTER SEPARATING THE AGGREGATE OF IMPURITIES FROM THE OIL.
Claim 2
Independent Claim
56 words
A METHOD OF SEPARATING DISPERSED IMPURITIES FROM USED LUBRICATING OIL WHICH COMPRISES, DISSOLVING IN THE OIL A MINOR BUT EFFECTIVE PROPORTION OF AN N-PHENYL ALKYLOL AMINE SELECTED FROM THE GROUP CONSISTING OF N-PHENYL ETHANOLAMINE, NPHENYL DIETHANOLAMINE, AND N-PHENYL ETHANOLISOPROPANOLAMINE SUFFICIENT TO CAUSE AGGREGATION OF THE IMPURITICS AND THEREAFTER SEPARATING THE AGGREGATE OF IMPURITIES FROM THE OIL.
References Cited (Backward Citations)
US1882002A
Cited
US2162195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |