US2692227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic distillation of straight chain paraffins from mixtures with branched chain paraffins with perfluoro compounds
Assignee: Phillips Petroleum Co
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Filing: 1950-12-20
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Granted: 1954-10-19
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Expires: 1970-12-20
Abstract
No abstract record available.
Inventors
- 👤 Martin R Cines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:43
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
THE METHOD FOR SEPARATING NORMAL HEPTANE FROM ADMIXTURE WITH A CLOSE BOILING BRANCHED CHAIN PARAFFINIC HYDROCARBON COMPRISING SUBJECTING THE ADMIXTURE OF HYDROCARBONS TO DISTILLATION CONDITIONS IN THE PRESENCE OF A COMPLETELY FLUORINATED ORGANIC COMPOUND BOILING WITHIN 70* F. OF THE BOILING POINT OF N-HEPTANE AND SELECTED FROM THE GROUP OF COMPOUNDS CONSISTING OF PERFLUOROPARAFFINS, PERFLUORO-DI-ALKYLETHERS, PERFLUORO-TRIALKYL AMINES, PERFLUORO-CYCLOPARAFFINS AND PERFLUORO-ALKYL-CYCLOPARAFFINS, AS AN ENTRAINER, CONDENSING THE OVERHEAD VAPORS, SEPARATING THE CONDENSATE INTO A HYDROCARBON PHASE RICH IN NHEPTANE AND CONTAINING SOME OF SAID COMPLETELY FLUORINATED ORGANIC COMPOUND IN SOLUTION AND A COMPLETELY FLUORINATED ORGANIC COMPOUND PHASE CONTAINING SOME N-HEPTANE IN SOLUTION, RECYCLING THIS LATTER FLUORINATED ORGANIC COMPOUND PHASE CONTAINING SOME N-HEPTANE INTOTHE ORIGINAL DIS-
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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) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |