US3642912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of phenols
Assignee: COAL TAR RESEARCH ASS
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Filing: 1967-12-11
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Granted: 1972-02-15
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Expires: 1987-12-11
Abstract
Abstract TITANIUM DIOXIDE IS USED TO CATALYSE THE REACTION BETWEEN AT LEAST ONE ALCOHOL AND AT LEAST ONE PHENOL IN THE VAPOR PHASE, SO AS TO GIVE ALKYLPHENOLS. THE TEMPERATURE RANGE PREFERRED FOR THE REACTION IS ABOUT 250*C. TO ABOUT 500*C. THE REACTION CAN BE CARRIED OUT IN A FLUIDIZED BED REACTOR.
Inventors
- 👤 John Alan Sharp
- 👤 Raymond Ernest Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:49
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |