US2795633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demethylation process
Assignee: ExxonMobil Oil Corp
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Filing: 1952-09-16
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Granted: 1957-06-11
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Expires: 1972-09-16
Abstract
No abstract record available.
Inventors
- 👤 Harry L Coonradt
- 👤 Wilbur K Leaman
- 👤 Barton W Rope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:31
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2521/00; C07C2521/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR THE DEMETHYLATION OF METHYL-SUBSTITUTED AROMATIC HYDROCARBONS, WHICH COMPRISES CONTACTING A METKHYL-SUBSTITUTED AROMATIC HYDROCARBON WITH AN ALUMINASILICA CATALYST CONSISTILNG OF BETWEEN ABOUT ONE PERCENT AND ABOUT 20 PERCENT SILICA, BY WEIGHT, AND THE BALANCE OF SAID CATALYST BEING ALUMINA, AT A TEMPERATURE OF BETWEEN ABOUT 1000*F. AND ABOUT 1200*F., FOR A PERIOD OF TIME OF BETWEEN ABOUT TWO SECONDS AND ABOUT 1000 SECONDS, AND IN THE PRESENCE OF HYDROGEN GAS.
Claim 2
Dependent Claim
72 words
A PROCESS FOR THE DEMETHYLATION OF METHYL-SUBSTITUTED AROMATIC HYDROCARBONS, WHICH COMPRISES CONTACTING A METKHYL-SUBSTITUTED AROMATIC HYDROCARBON WITH AN ALUMINASILICA CATALYST CONSISTILNG OF BETWEEN ABOUT ONE PERCENT AND ABOUT 20 PERCENT SILICA, BY WEIGHT, AND THE BALANCE OF SAID CATALYST BEING ALUMINA, AT A TEMPERATURE OF BETWEEN ABOUT 1000*F. AND ABOUT 1200*F., FOR A PERIOD OF TIME OF BETWEEN ABOUT TWO SECONDS AND ABOUT 1000 SECONDS, AND IN THE PRESENCE OF HYDROGEN GAS.
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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |