US3102149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of phenol
Assignee: Shawinigan Chemicals Ltd
•
Filing: 1959-12-07
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Granted: 1963-08-27
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Expires: 1979-12-07
Abstract
No abstract record available.
Inventors
- 👤 Sydney E Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:37
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A PROCESS FOR THE PURIFICATION OF PHENOL DERIVED FROM CUMENE BY OXIDATION FOLLOWED BY CLEAVAGE OF THERESULTANT HYDROPEROXIDE, AND CONTAINING COLOUR-FORMING IMPURITIES, CONSISTING OF HEATING THE IMPURE PHENOL WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF THE HYDROXIDES OF SODIUM AND POTASSIUM AT A CONCENTRATION OF 0.025 TO 0.25 POUND MOLES PER THOUSAND POUNDS OF PHENOL FOR A PERIOD OF SIXTEEN TO FORTY-EIGHT HOURS AT A TEMPERATURE OF 95* TO 170*C., DISTILLING THE PHENOL FROM THE RESULTANT MIXTURE, HEATING THE PHENOL DISTILLATE WITH 0.1 TO 1.0% FERRIC CHLORIDE BY WEIGHT FOR FOURTEEN DAYS TO EIGHT HOURS AT TEMPERATURES BETWEEN THE MELTING POINT OF 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) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |