Patent US4265692A successfully refreshed from Google Patents.
Patent US2586602A successfully refreshed from Google Patents.
US2586602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of alcoholic liquid
Assignee: —
•
Filing: —
•
Granted: 1952-02-19
•
Expires: 1969-02-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:43
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/86; C07C31/00; C07C31/02; C07C31/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR PRODUCING ISOPROPANOL OF IMPROVED ODOR CHARACTERISTICS WHICH COMPRISES ABSORBING PROPYLENE IN SULFURIC ACID TO FORM AN ISOPROPYL EXTRACT, HYDROLYZING THE EXTRACT WITH WATER, STREAM DISTILLING THE EXTRACT TO PRODUCE A CRUDE ISOPROPANOL DISTILLATE CONTAINING APPROXIMATELY 65 TO 70% BY VOLUME OF ISOPROPYL ALCOHOL, DILUTING THE CRUDE DISTILLATE WITH WATER UNTIL THE
Claim 2
Dependent Claim
54 words
A PROCESS FOR PRODUCING ISOPROPANOL OF IMPROVED ODOR CHARACTERISTICS WHICH COMPRISES ABSORBING PROPYLENE IN SULFURIC ACID TO FORM AN ISOPROPYL EXTRACT, HYDROLYZING THE EXTRACT WITH WATER, STREAM DISTILLING THE EXTRACT TO PRODUCE A CRUDE ISOPROPANOL DISTILLATE CONTAINING APPROXIMATELY 65 TO 70% BY VOLUME OF ISOPROPYL ALCOHOL, DILUTING THE CRUDE DISTILLATE WITH WATER UNTIL THE
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) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |