US2678951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of phenols
Assignee: Shell Development Co
•
Filing: 1951-12-26
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Granted: 1954-05-18
•
Expires: 1971-12-26
Abstract
No abstract record available.
Inventors
- 👤 William C Smith
- 👤 Masterton Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:05
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS OF PRODUCING 2,3,5-TRIMETHYL PHENOL WHICH COMPRISES CONTACTING METHANOL AND 3,5-XYLENOL IN THE VAPOR PHASE WITH AN ADSORPTIVE ALUMINA CATALYST AT 475* C. TO 550* C. IN A MOLE RATIO OF 0.5:1 TO 1:1 MOLE OF METHANOL PER MOLE OF XYLENOL AND ADDING TO THE REACTION MIXTURE 2 TO 6 MOLES OF STEAM PER MOLE OF XYLENOL FED TO THE REACTION.
Claim 2
Dependent Claim
62 words
A PROCESS OF PRODUCING 2,3,5-TRIMETHYL PHENOL WHICH COMPRISES CONTACTING METHANOL AND 3,5-XYLENOL IN THE VAPOR PHASE WITH AN ADSORPTIVE ALUMINA CATALYST AT 475* C. TO 550* C. IN A MOLE RATIO OF 0.5:1 TO 1:1 MOLE OF METHANOL PER MOLE OF XYLENOL AND ADDING TO THE REACTION MIXTURE 2 TO 6 MOLES OF STEAM PER MOLE OF XYLENOL FED TO THE REACTION.
References Cited (Backward Citations)
US2448942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |