US2744149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of m- and p-cymene mixture by isomerization of cymene
Assignee: Hercules Powder Co
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Filing: 1953-06-29
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Granted: 1956-05-01
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Expires: 1973-06-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Herman I Enos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:31
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/274; C07C5/2748; C07C5/2751
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE PROCESS FOR THE PRODUCTION OF A MIXTURE OF O-, M-, AND P-CYMENE IN WHICH THE O-CYMENE CONTENT IS LES THAN ABOUT 5% WHICH COMPRISES SUBJECTING A CYMENE TO CONTACT WITH 0.1-2 MOLE PER CENT ALUMINUM CHLORIDE, BASED ON THE MOLES BENZENOID MATERIALS IN THE REACTION MIXTURE AT 80* C. UNDER ISOMERIZING CONDITIONS UN THE ISOMERIZED CYMENE MIXTURE CONTAINS ESSENTIALLY MAND P-CYMENE AND LESS THAN ABOUT 5% O-CYMENE BASED ON THE TOTAL CYMENE CONTENT AND SEPARATING THE MIXTURE FROM THE CATALYST.
Claim 2
Dependent Claim
81 words
THE PROCESS FOR THE PRODUCTION OF A MIXTURE OF O-, M-, AND P-CYMENE IN WHICH THE O-CYMENE CONTENT IS LES THAN ABOUT 5% WHICH COMPRISES SUBJECTING A CYMENE TO CONTACT WITH 0.1-2 MOLE PER CENT ALUMINUM CHLORIDE, BASED ON THE MOLES BENZENOID MATERIALS IN THE REACTION MIXTURE AT 80* C. UNDER ISOMERIZING CONDITIONS UN THE ISOMERIZED CYMENE MIXTURE CONTAINS ESSENTIALLY MAND P-CYMENE AND LESS THAN ABOUT 5% O-CYMENE BASED ON THE TOTAL CYMENE CONTENT AND SEPARATING THE MIXTURE FROM THE CATALYST.
References Cited (Backward Citations)
US2429691A
Cited
US2527824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |