Patent US2533754A successfully refreshed from Google Patents.
US2533754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification process
Assignee: Shell Development Co
•
Filing: 1947-11-04
•
Granted: 1950-12-12
•
Expires: 1967-11-04
Abstract
No abstract record available.
Inventors
- 👤 Seaver A Ballard
- 👤 Bradford P Geyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:38
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/88
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
73 words
IN AMETHOD OF PURIFYING A CRUDE AQUEOUS, ALDEHYDE-CONTAINING ETHANOL SOLUTION HAVING A ZERO PERMANGANATE TIME, THE STEPS CONSISTING OF DISSOLVING FROM 0.1 TO 3% BY WEIGHT ALKALI METAL HYDROXIDE IN TEH SOLUTION, REFLUXING THE RESULTING HYDROXIDE-CONTAINING SOLUTION FOR A PERIOD OF AT LEAST ONE-HALF HOUR, AND RECOVERING A PURIFIED ETHANOL SOLUTION AS A DISTILLATE FROM THE REFLUXED SOLUTION, SAID PURIFIED ALCOHOL SOLUTION BEING CHARACTERIZED BY A PERMANGANATE TIME OF AT LEAST 15 MINUTES.
References Cited (Backward Citations)
US294285A
Cited
US432198A
Cited
USRE21727E
Cited
US2188274A
Cited
US2227485A
Cited
US2429484A
Cited
US2451857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |