Patent US2885451A successfully refreshed from Google Patents.
US2885451A
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Preparation of para-substituted cyclic compounds
Assignee: Universal Oil Products Co
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Filing: 1954-11-24
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Granted: 1959-05-05
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Expires: 1974-11-24
Abstract
No abstract record available.
Inventors
- 👤 Carl B Linn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:03
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/08; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/274; C07C5/2748
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR PRODUCING PARA-XYLENE FROM META-XYLENE WHICH COMPRISES HYDROGENATING THE META-XYLENE TO FORM 1,3-DIMETHYLCYCLOHEXANE, ISOMERIZING THE LAST-MENTIONED COMPOUND TO 1,4-DIMETHYLCYCLOHEXANEIN THE PRESENCE OF A HYDROGEN FLUORIDE CATALYST AT A TEMPERATURE OF FROM ABOUT 20* TO ABOUT 100*C, AND DEHYDROGENATING SAID 1,4-DIMETHYLCYCLOHEXANE TO FORM PARA-XYLENE THEREFROM.
Claim 2
Dependent Claim
46 words
A PROCESS FOR PRODUCING PARA-XYLENE FROM META-XYLENE WHICH COMPRISES HYDROGENATING THE META-XYLENE TO FORM 1,3-DIMETHYLCYCLOHEXANE, ISOMERIZING THE LAST-MENTIONED COMPOUND TO 1,4-DIMETHYLCYCLOHEXANEIN THE PRESENCE OF A HYDROGEN FLUORIDE CATALYST AT A TEMPERATURE OF FROM ABOUT 20* TO ABOUT 100*C, AND DEHYDROGENATING SAID 1,4-DIMETHYLCYCLOHEXANE TO FORM PARA-XYLENE THEREFROM.
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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |