US2786876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demethylation of methylbenzenes
Assignee: ExxonMobil Oil Corp
•
Filing: 1952-09-16
•
Granted: 1957-03-26
•
Expires: 1972-09-16
Abstract
No abstract record available.
Inventors
- 👤 Harry L Coonradt
- 👤 Wilbur K Leaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:23
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
85 words
A PROCESS FOR DEMETHYLATING METHYLBENZENES, WHICH COMPRISES CONTACTING A METHYLBENZENE WITH A SILICAALUMINA CRACKING CATALYST CONTAINING BETWEEN ABOUT 5 PERCENT AND ABOUT 20 PERCENT ALUMINA AND BETWEEN ABOUT 95 PERCENT AND ABOUT 80 PERCENT SILICA, AT A TEMPERATURE OF BETWEEN ABOUT 1050*F. AND ABOUT 1200*F., FOR A CONTACT TIME OF BETWEEN ABOUT 40 SECONDS AND ABOUT 1000 SECONDS, AND IN THE PRESENCE OF HYDROGEN GAS UNDER A PRRSSURE OF BETWEEN ABOUT 100 POUNDS PER SQUARE INCH GAUGE, AND ABOUT 500 POUNDS PER SQUARE INCH GAUGE.
Claim 2
Dependent Claim
85 words
A PROCESS FOR DEMETHYLATING METHYLBENZENES, WHICH COMPRISES CONTACTING A METHYLBENZENE WITH A SILICAALUMINA CRACKING CATALYST CONTAINING BETWEEN ABOUT 5 PERCENT AND ABOUT 20 PERCENT ALUMINA AND BETWEEN ABOUT 95 PERCENT AND ABOUT 80 PERCENT SILICA, AT A TEMPERATURE OF BETWEEN ABOUT 1050*F. AND ABOUT 1200*F., FOR A CONTACT TIME OF BETWEEN ABOUT 40 SECONDS AND ABOUT 1000 SECONDS, AND IN THE PRESENCE OF HYDROGEN GAS UNDER A PRRSSURE OF BETWEEN ABOUT 100 POUNDS PER SQUARE INCH GAUGE, AND ABOUT 500 POUNDS PER SQUARE INCH GAUGE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |