US2744938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of color impurities from organic compounds
Assignee: Universal Oil Products Co
•
Filing: 1952-07-24
•
Granted: 1956-05-08
•
Expires: 1972-07-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Peter Urban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:06
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/34; C07C41/36; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR DECOLORIZING 2-TERTIARY BUTYL-4METHOXYPHENOL CONTAMINATED WITH A DISCOLORING IMPURITY WHICH COMPRISES DISSOLVING SAID PHENOL IN A SOLVENT CONSISTING ESSENTIALLY OF ETHYL ALCOHOL, MIXING THE RESULTING SOLUTION WITH A CATALYST-FREE ACTIVATED VEGATABLE CHARCOAL AT A TEMPERATURE CORRESPONDING TO THE BOILING POINT OF THE ALCHOL AND IN THE PRESENCE OF HYDROGEB MAINTAINED AT A SUPERATMOSPHERIC PRESSURE OF FROM ABOUT 5 TO ABOUT 300 POUNDS PER SQUARE INCH TO ABSORB THE DISCOLORING IMPURITY IN SAID CHARCOAL, AND SEPARATING THE THUS TREATED SOLUTION FROM THE CHARCOAL.
Claim 2
Dependent Claim
84 words
A PROCESS FOR DECOLORIZING 2-TERTIARY BUTYL-4METHOXYPHENOL CONTAMINATED WITH A DISCOLORING IMPURITY WHICH COMPRISES DISSOLVING SAID PHENOL IN A SOLVENT CONSISTING ESSENTIALLY OF ETHYL ALCOHOL, MIXING THE RESULTING SOLUTION WITH A CATALYST-FREE ACTIVATED VEGATABLE CHARCOAL AT A TEMPERATURE CORRESPONDING TO THE BOILING POINT OF THE ALCHOL AND IN THE PRESENCE OF HYDROGEB MAINTAINED AT A SUPERATMOSPHERIC PRESSURE OF FROM ABOUT 5 TO ABOUT 300 POUNDS PER SQUARE INCH TO ABSORB THE DISCOLORING IMPURITY IN SAID CHARCOAL, AND SEPARATING THE THUS TREATED SOLUTION FROM THE CHARCOAL.
References Cited (Backward Citations)
US1973833A
Cited
US1971930A
Cited
US2444589A
Cited
US2574331A
Cited
US2616830A
Cited
US2488479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |