US2657243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isopropyl alcohol process
Assignee: Standard Oil Development Co
•
Filing: 1948-09-15
•
Granted: 1953-10-27
•
Expires: 1968-09-15
Abstract
No abstract record available.
Inventors
- 👤 Albert P Giraitis
- 👤 Mack C Fuqua
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:27
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
IN THE PRODUCTION OF HIGH QUALITY ISOPROPYL ALCOHOL BY HYDRATION OF PROPYLENE IN THE PRESENCE OF SULFURIC ACID, THE STEPS OF SEPARATING BY DISTILLATION A PROPYLENE-RICH FRACTION CONTAINING BETWEEN 0.1 AND 1% BY WEIGHT OF C4 HYDROCARBONS AND FROM 0.05 TO 0.15% C3 ACETYLENES FROM A COMMERCIAL PROPYLENE FRACTION, PARTIALLY CONDENSING UNDER INCREASED PRESSURE FROM SAID PROPYLENE-RICH FRACTION A CONDENSATE CONTAINING 10 TO 60 WEIGHT PER CENT OF C3 HYDROCARBONS WITH A PORTION OF THE C4 HYDROCARBONS AND C3 ACETYLENES SO AS TO LEAVE THE REMAINING PROPYLENE-RICH VAPOR FRACTION WITH A C4 HYDROCARBON CONTENT OF LESS THAN 0.1 WEIGHT PER CENT AND A C3 ACETYLENE CONTENT OF LESS THAN 0.05 WEIGHT PER CENT.
References Cited (Backward Citations)
US1465600A
Cited
GB297842A
Cited
US1957818A
Cited
US2055720A
Cited
US2222276A
Cited
GB586831A
Cited
US2409773A
Cited
US2370948A
Cited
US2431685A
Cited
US2514294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |