Patent US2617838A successfully refreshed from Google Patents.
US2617838A
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Isomerization of aromatic compounds
Assignee: Beazer East Inc
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Filing: 1947-10-02
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Granted: 1952-11-11
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Expires: 1967-10-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Nickels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:25
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2735
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE PROCESS OF ISOMERIZING ALPHA-ETHYLNAPTHALENE TO BETA-ETHYLNAPTHALENE IN A MIXTURE CONTAINING SUBSTANTIALLY EQUAL PARTS OF THE TWO ISOMERS WHICH COMPRISES VAPORIZING SAID MIXTURE, PASSING THE VAPORS IN ADMIXTURE WITH HYDROGEN HALIDE IN CONTACT WITH MAGNESIA-ALUMINA CATALYST UNDER ISOMERIZING CONDITIONS.
Claim 2
Dependent Claim
39 words
THE PROCESS OF ISOMERIZING ALPHA-ETHYLNAPTHALENE TO BETA-ETHYLNAPTHALENE IN A MIXTURE CONTAINING SUBSTANTIALLY EQUAL PARTS OF THE TWO ISOMERS WHICH COMPRISES VAPORIZING SAID MIXTURE, PASSING THE VAPORS IN ADMIXTURE WITH HYDROGEN HALIDE IN CONTACT WITH MAGNESIA-ALUMINA CATALYST UNDER ISOMERIZING CONDITIONS.
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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) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |