US2575243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation of alcohols
Assignee: Standard Oil Development Co
•
Filing: 1948-04-27
•
Granted: 1951-11-13
•
Expires: 1968-04-27
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
2026-11-04 19:43
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE METHOD OF SEPARATING C3 TO C5 SATURATED MONOHYDRIC ALCOHOLS HAVING NORMAL BOILING POINTS ABOVE THAT OF ISOPROPANOL AND WHICH FORM CLOSE-BOILING MIXTURES DIFFICULT TO SEPARATE BY ORDINARY FRACTIONAL DISTILLATION, WHICH COMPRISES CONTINUOUSLY INTRODUCING A FEED MIXTURE OF SAID ALCOHOLS TO A FRACTIONAL DISTILLATION ZONE WHEREIN VAPORS OF SAID ALCOHOLS ASCEND COUNTERCURRENTLY TO LIQUID REFLUX OF THE ALCOHOLS DISSOLVED IN 70-99 VOLUME PERCENT OF A GLYCOL ETHER-ESTER TO EFFECT VAPORIZATION OF THE LOWER MOLECULAR WEIGHT
Claim 2
Independent Claim
75 words
THE METHOD OF SEPARATING C3 TO C5 SATURATED MONOHYDRIC ALCOHOLS HAVING NORMAL BOILING POINTS ABOVE THAT OF ISOPROPANOL AND WHICH FORM CLOSE-BOILING MIXTURES DIFFICULT TO SEPARATE BY ORDINARY FRACTIONAL DISTILLATION, WHICH COMPRISES CONTINUOUSLY INTRODUCING A FEED MIXTURE OF SAID ALCOHOLS TO A FRACTIONAL DISTILLATION ZONE WHEREIN VAPORS OF SAID ALCOHOLS ASCEND COUNTERCURRENTLY TO LIQUID REFLUX OF THE ALCOHOLS DISSOLVED IN 70-99 VOLUME PERCENT OF A GLYCOL ETHER-ESTER TO EFFECT VAPORIZATION OF THE LOWER MOLECULAR WEIGHT
References Cited (Backward Citations)
US2107265A
Cited
US2339160A
Cited
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 |