US2679472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of hydrocarbons by azeotropic distillation
Assignee: Phillips Petroleum Co
•
Filing: 1951-12-10
•
Granted: 1954-05-25
•
Expires: 1971-12-10
Abstract
No abstract record available.
Inventors
- 👤 James W Tooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:28
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
IN THE REFINING A HYDROCARBONS THE IMPROVEMENT COMPRISING SUBJECTING A NARROW BOILING RANGE MIXTURE OF HYDROCARBONS COMPRISING 2,2- AND 2,4-DIMETHYLPENTANES AND CYCLOHEXANE TO DISTILLATION CONDITIONS IN THE PRESENCE OF ACETONITRILE, RECOVERING CYCLOHEXANE FROM THE KETTLE PRODUCT AND RECOVERING SAID DIMETHYLPENTANES FROM THE OVERHEAD DISTILLATE.
Claim 2
Dependent Claim
44 words
IN THE REFINING A HYDROCARBONS THE IMPROVEMENT COMPRISING SUBJECTING A NARROW BOILING RANGE MIXTURE OF HYDROCARBONS COMPRISING 2,2- AND 2,4-DIMETHYLPENTANES AND CYCLOHEXANE TO DISTILLATION CONDITIONS IN THE PRESENCE OF ACETONITRILE, RECOVERING CYCLOHEXANE FROM THE KETTLE PRODUCT AND RECOVERING SAID DIMETHYLPENTANES FROM THE OVERHEAD DISTILLATE.
References Cited (Backward Citations)
US2540318A
Cited
US2463479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |