Patent US2678337A successfully refreshed from Google Patents.
US2678337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic isomerization of methyl substituted phenols
Assignee: Shell Development Co
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Filing: 1952-04-15
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Granted: 1954-05-11
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Expires: 1972-04-15
Abstract
No abstract record available.
Inventors
- 👤 George M Good
- 👤 Holzman George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
C; C07; C07C; C07C37/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
PROCESS FOR THE ISOMERIZATION OF METHYL SUBSTITUTED PHENOLS WHICH COMPRISES CONTAINING A METHYL SUBSTITUTED PHENOL IN THE VAPOR PHASE IN THE PRESENCE OF AT LEAST AN EQUIMOLAR AMOUNT OF ADDED HYDROGEN WITH A HYDROFLUORIC ACID TREATED ADSORPTIVE ALUMINA CONTAINING LESS THAN 5% FLUORINE AT A PRESSURE BELOW ABOUT 50 POUNDS PER SQUARE INCH AND AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 425* C. TO ABOUT 525 C.
Claim 2
Dependent Claim
68 words
PROCESS FOR THE ISOMERIZATION OF METHYL SUBSTITUTED PHENOLS WHICH COMPRISES CONTAINING A METHYL SUBSTITUTED PHENOL IN THE VAPOR PHASE IN THE PRESENCE OF AT LEAST AN EQUIMOLAR AMOUNT OF ADDED HYDROGEN WITH A HYDROFLUORIC ACID TREATED ADSORPTIVE ALUMINA CONTAINING LESS THAN 5% FLUORINE AT A PRESSURE BELOW ABOUT 50 POUNDS PER SQUARE INCH AND AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 425* C. TO ABOUT 525 C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |