Patent US3592951A successfully refreshed from Google Patents.
US3592951A
Expired / Lapsed
US
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Process for alkylating a phenol
Assignee: Ethyl Corp
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Filing: 1967-12-28
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Granted: 1971-07-13
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Expires: 1987-12-28
Abstract
Abstract THE REACTION OF FROM ABOUT 1 TO 2 MOLE EQUIVALENTS OF A PHENOL UNSUBSTITUTED IN AT LEAST ONE POSITION ORTHO OR PARA TO THE PHENOLIC HYDROXYL GROUP WITH ABOUT 2 MOLE EQUIVALENTS OF FORMALDEHYDE AND ABOUT ONE MOLE EQUIVALENT OF ETHYLENEDIAMINE EFFECTS NUCLEAR METHYLATION OF THE PHENOL. FOR EXAMPLE, THE REACTION OF 2 MOLES OF 2,6-DITERT-BUTYPHENOL WITH 2 MOLES OF FORMALDEHYDE AND ONE MOLE OF ETHYLENEDIAMINE FORMS 2,6-DI-TERT-BUTYL-P-CRESOL. THE PRODUCTS ARE USEFUL AS ANTIOXIDANTS.
Inventors
- 👤 Edward F Zaweski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/20
Claims Analysis
Total Claims: 0
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |