Patent US4464590A successfully refreshed from Google Patents.
US3576014A
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Alkyl substituted dihydrofurans and method of manufacture
Assignee: Firmenich SA
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Filing: 1968-06-12
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Granted: 1971-04-20
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Expires: 1988-06-12
Abstract
Abstract THE PRESENT INVENTION RELATES TO A NOVEL PROCESS FOR PREPARING DIHYDROFURAN DERIVATIVES OF FORMULA 2,5-DI(R-),4-(HO-)-2,3-DIHYDROFURAN-3-ONE WHEREIN ONE OF THE SYMBOLS R MEANS A METHYL RADICAL AND THE OTHER ONE AN ETHYL RADICAL OR WHEREIN BOTH SYMBOLS R REPRESENT METHYL RADICALS. THE COMPOUNDS OF FORMULA I POSSES VALUABLE ORGANOLEPTIC PROPERTIES AND ARE, THEREFORE, USEFUL AS FLAVOURING AGENTS AND AS FRAGRANCES. THE INVENTION ALSO RELATES TO THOSE COMPOUNDS OF FORMULA I WHEREIN ONE OF THE R''S IS ETHYL AND WHICH ARE NEW SUBSTANCES. THE INVENTION FURTHERMORE RELATES TO NEW INTERMEDIATES USED IN THE SAID NEW PROCESS AND TO METHODS FOR PREPARING THEM.
Inventors
- 👤 Luciano Re
- 👤 Gunther Ohloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:13
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/60; A; A23; A23L; A23L27/00; A23L27/20; A23L27/205; A23L27/2052; C07C; C07C29/00; C07C29/36; C07C29/38; C07C29/42; C07C45/00; C07C45/40; C07C45/56; C07C45/57; C07C45/59; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C49/00; C07C49/04; C07C49/17
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |