Patent US3592826A successfully refreshed from Google Patents.
US3592826A
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US
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Imidazole catalysts for diketene reactions
Assignee: Union Carbide Corp
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Filing: 1967-05-22
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Granted: 1971-07-13
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Expires: 1987-05-22
Abstract
Abstract IMIDAZOLE CATALYZED-REACTIONS FOR THE PRODUCTION OF DEHYDROACETIC ACID. 2,4,6-HEPTANETRIONE AND 2,6-DIMETHYL-4PYRANONE FROM DIKETENE ARE DISCLOSED. THE EXAMPLES ILLUSTRATE THE USE OF 1-METHYLIMIDAZOLE; 1-ETHYLIMIDAZOLE; 1-ISOPROPYLIMIDAZOLE; 1-OCTYLIMIDAZOLE; 1,2-DIMETHYLIMIDAZOLE; 1,2-DIETHYL-4-METHYLIMIDAZOLE TO CATALYZE THE REACTIONS.
Inventors
- 👤 Erich Marcus
- 👤 John Kai-Fai Chan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:52
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/34; C07D309/36; C07D309/38; C07C; C07C49/00; C07C49/04; C07C49/12; C07C51/00; C07C51/347; C07C51/373; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |