Patent US2663743A successfully refreshed from Google Patents.
US2663743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of phenol
Assignee: Hercules Powder Co
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Filing: 1949-04-08
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Granted: 1953-12-22
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Expires: 1969-04-08
Abstract
No abstract record available.
Inventors
- 👤 Bewley Thomas
- 👤 Wilkins Frederick John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:50
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/72
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
IN THE MANUFACTURE OF PHENOL BY THE OXIDATION OF ISOPROPHYL BENZENE INTO ISOPROPYL BENZENE HYDROPEROXIDE AND THE DECOMPOSITION OF SAID HYDROPEROXIDE IN ITS SOLUTION IN UNCHANGED ISOPROPYL BENZENE TO FORM PHENOL, THE STEP OF RECOVERING THE PHENOL FROM SAID SOLUTION CONTAINING IN ADDITION ACETONE AND METHYL STYRENE WHICH COM-
References Cited (Backward Citations)
US2199786A
Cited
US2339889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |