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Patent US3052728A successfully refreshed from Google Patents.
US3052728A
Expired / Lapsed
US
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Decolorization of cryptophenols by treatment with carbon dioxide
Assignee: Shell USA Inc
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Filing: 1959-11-30
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Granted: 1962-09-04
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Expires: 1979-11-30
Abstract
No abstract record available.
Inventors
- 👤 Albert L Rocklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:25
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86; C07C41/00; C07C41/01; C07C41/34; C07C41/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A PROCESS FOR SUBSTANTIALLY DECOLORIZING A NORMALLY UNCOLORED PHENOLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF 2,4,6-TRIALKYLPHENOL, 2,6-DIALKYL-4-HYDROXYMETHYLPHENOL, 2,6-DIALKYL-4-ALKOXYALKYLPHENOL, AND BIS(3,5-DIALKYL-4-HYDROXYPHENYL)ALKANE, SAID COMPOUND HAVING AT LEAST ONE OF THE ALKYL GROUPS ORTHO TO THE PHENOLIC HYDROXYL GROUP BRANCHED ON THE ALPHA CARBON ATOM, IN A LIQUID CONTAINING MISCIBLE BASE, WHICH COMPRISES INTRODUCING INTO SAID LIQUID AN AMOUNT OF CARBON DIOXIDE SUFFICIENT TO SUBSTANTIALLY DECOLORIZE THE PHENOLIC COMPOUND, SAID COMPOUND HAVING BEEN DISCOLORED PRIOR TO TREATMENT WITH THE CARBON DIOXIDE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |