Patent US2541673A successfully refreshed from Google Patents.
US2541673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weak-acid isopropanol process
Assignee: —
•
Filing: —
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Granted: 1951-02-13
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Expires: 1968-02-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:25
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/02; C07C31/10; C07C29/00; C07C29/03; C07C29/04; C07C29/74; C07C29/76; C07C29/80; C07C31/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
AN IMPROVED PROCESS FOR THE PREPARATION OF CRUDE ISOPROPYL ALCOHOL WHICH COMPRISES CONTACTING A PROPYLENE-RICH HYDROCARBON WHICH IS ESSENTIALLY FREE OF HIGHER OLEFINS WITH SULFURIC ACID OF APPROXIMATELY 70% CONCENTRATION IN AN ABSORPTION ZONE WHEREBY AN EXTRACT LIQUOR IS FORMED, RECOVERING UNREACTED VENT GASES FROM THE ABSORPTION ZONE, SCRUBBING THE UNREACTED VENT GASES WITH WATER TO RECOVER SULFURIC ACID AND ISOPROPYL ALCOHOL THEREFROM, WITHDRAWING THE EXTRACT LIQUOR FROM THE ABSORPTION ZONE AND DILUTING THE EXTRACT LIQUOR WITH THE WATER RECOVERED FROM THE SCRUBBING OF THE VENT GASES WHEREBY DILUTE ISOPROPYL ALCOHOL IS FORMED.
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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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |