Patent US669705A successfully refreshed from Google Patents.
US2575285A
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Extractive distillation of alcohol-containing mixtures with diphenyl ether as solvent
Assignee: Standard Oil Development Co
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Filing: 1949-01-07
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Granted: 1951-11-13
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Expires: 1969-01-07
Abstract
No abstract record available.
Inventors
- 👤 Carl S Carlson
- 👤 Jr Paul V Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:21
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE METHOD OF SEPARATING AN ALCOHOL HAVING FROM 3 TO 6 CARBON ATOMS FROM C3 TO C6 OXYGENATED ORGANIC COMPOUNDS OF THE CLASS CONSISTING OF ALCOHOLS AND NEUTRAL CARBONYL COMPOUNDS WHICH FORM CLOSE-BOILING MIXTURES DIFFICULT TO SEPARATE BY ORDINARY FRACTIONAL DISTILLATION, WHICH COMPRISES CONTINUOUSLY INTRODUCING A FEED MIXTURE OF SAID OXYGENERATED COMPOUNDS TO FRACTIONAL DISTILLATION ZONE WHEREIN VAPORS OF SAID COMPOUNDS ASCEND COUNTERCURRENTLY TO A HOMOGENOUS LIQUID REFLUX OF THE OXYGENATED COMPOUNDS DISSOLVED IN A SUFFICIENTLY HIGH PROPORTION OF DI-
Claim 2
Independent Claim
80 words
THE METHOD OF SEPARATING AN ALCOHOL HAVING FROM 3 TO 6 CARBON ATOMS FROM C3 TO C6 OXYGENATED ORGANIC COMPOUNDS OF THE CLASS CONSISTING OF ALCOHOLS AND NEUTRAL CARBONYL COMPOUNDS WHICH FORM CLOSE-BOILING MIXTURES DIFFICULT TO SEPARATE BY ORDINARY FRACTIONAL DISTILLATION, WHICH COMPRISES CONTINUOUSLY INTRODUCING A FEED MIXTURE OF SAID OXYGENERATED COMPOUNDS TO FRACTIONAL DISTILLATION ZONE WHEREIN VAPORS OF SAID COMPOUNDS ASCEND COUNTERCURRENTLY TO A HOMOGENOUS LIQUID REFLUX OF THE OXYGENATED COMPOUNDS DISSOLVED IN A SUFFICIENTLY HIGH PROPORTION OF DI-
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) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |