Patent US3553270A successfully refreshed from Google Patents.
US3553270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phenolic thioethers
Assignee: Ethyl Corp
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Filing: 1967-12-22
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Granted: 1971-01-05
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Expires: 1987-12-22
Abstract
Abstract THE REACTION OF PHENOLS UNSUBSTITUTED IN AT LEAST ONE POSITION ORTHO OR PARATO THE HYDROXYL GROUP WITH FORMALDEHYDE AND MONO- OR DIMERCAPTANS YIELDS, RESPECTIVELY, A-(HYDROCARBYLTHIO)-CRESOLA OR A,A''-ALKYLENE DITHIOBIS COMPOUNDS. FOR EXAMPLE, THE REACTION OF 2,6-DI-TERT-BUTYLPHENOL WITH FORMALDEHYDE AND DODECYL MERCAPTAN YIELDS 2,6-DI-TERT-BUTYL-A-(DODECYLTHIO)-P-CRESOL. THE PRODUCTS ARE USEFUL AS ANTIOXIDANTS.
Inventors
- 👤 John C Wollensak
- 👤 Bernard R Meltsner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:22
CPC Classifications
C; C07; C07C; C07C323/00
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |