Patent US2744938A successfully refreshed from Google Patents.
US2744938A
Expired / Lapsed
US
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Removal of color impurities from organic compounds
Assignee: Universal Oil Products Co
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Filing: 1952-07-24
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Granted: 1956-05-08
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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 15:10
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)
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US2444589A
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US2616830A
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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) | 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 |