US2878182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of a recirculating solvent
Assignee: Universal Oil Products Co
•
Filing: 1953-07-20
•
Granted: 1959-03-17
•
Expires: 1973-07-20
Abstract
No abstract record available.
Inventors
- 👤 Herman S Bloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:40
CPC Classifications
B; B01; B01J; B01J41/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A PROCESS FOR THE SEPARATION OF AN AROMATIC HYDROCARBON FROM A HYDROCARBON MIXTURE CONTAINING THE SAME BY EXTRACTION WITH A CYCLICALLY CIRCULATING SELECTIVE SOLVENT COMPRISING WATR AND GLYCOL SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL AND DIPROPYLENE GYCOL, AND METHOD OF RETARDING DETERIORATION OF THE SELECTIVE SOLVENT AND MAINTAINING THE SOLVENT CHARACTERISTICS OF THE LATTER SUBSTANTIALLY CONSTANT, WHICH COMPRISES CONTACTING AT LEAST A PORTION OF THE CIRCULATING SELECTIVE SOLVENT WITH AN ANION EXCHANGE RESIN TO REMOVE THE ACIDS CONTAINED THEREIN.
Claim 2
Dependent Claim
84 words
IN A PROCESS FOR THE SEPARATION OF AN AROMATIC HYDROCARBON FROM A HYDROCARBON MIXTURE CONTAINING THE SAME BY EXTRACTION WITH A CYCLICALLY CIRCULATING SELECTIVE SOLVENT COMPRISING WATR AND GLYCOL SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL AND DIPROPYLENE GYCOL, AND METHOD OF RETARDING DETERIORATION OF THE SELECTIVE SOLVENT AND MAINTAINING THE SOLVENT CHARACTERISTICS OF THE LATTER SUBSTANTIALLY CONSTANT, WHICH COMPRISES CONTACTING AT LEAST A PORTION OF THE CIRCULATING SELECTIVE SOLVENT WITH AN ANION EXCHANGE RESIN TO REMOVE THE ACIDS CONTAINED THEREIN.
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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) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |