US3629292A
Expired / Lapsed
US
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Process for the preparation of 2 5-dialkyl-4-hydroxy-(2h)-furan-3-ones
Assignee: International Flavors and Fragrances Inc
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Filing: 1970-02-10
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Granted: 1971-12-21
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Expires: 1990-02-10
Abstract
Abstract PROCESS FOR THE PREPARATION OF DIALKYLHYDROXYFURAN3-ONES WHICH COMPRISE REACTING DIHALODIKETONES HAVING THE STRUCTURE R-CH(-X)-CO-CO-CH(-X)-R WHEREIN EACH X IS A HALOGEN ATOM AND R IS LOWER ALKYL, WITH AQUEOUS ALKALI AT 75* TO 125*C.
Inventors
- 👤 William J Evers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:06
CPC Classifications
C; C11; C11B; C11B9/00; C11B9/0069; C11B9/0073; A; A23; A23L; A23L27/00; A23L27/20; A23L27/205; A23L27/2052; C07; C07C; C07C45/00; C07C45/61; C07C45/63; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/60
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |