US3651097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of 2-methyl and 2-ethyl-3-hydroxy - 4 5 --dihydrofuran-4-one from monosaccharide 5-esters
Assignee: Lever Brothers Co
•
Filing: 1969-03-11
•
Granted: 1972-03-21
•
Expires: 1989-03-11
Abstract
Abstract CERTAIN 2-ALKYL-3-HYDROXY-4,5-DIHYDROFURAN-4-ONES USEFUL AS FLAVOURING AGENTS, PARTICULARLY IN MEATY FLAVOURS CAN BE PREPARED FROM MONOSACCHARIDE 5-ESTERS. THE PHOSPHATE ESTERS ARE PARTICULARLY USEFUL AS STARTING MATERIALS. THE MONOSACCHARIDE 5-ESTERS ARE REACTED WITH NUCLEOPHILLIC AGENTS, SUCH AS DIETHYLAMINE, IN AN AQUEOUS MEDIUM AT A CAREFULLY CONTROLLED PH BETWEEN 2 AND 8 PREFERABLY IN THE PRESENCE OF A BUFFER SYSTEM.
Inventors
- 👤 Godefridus Antonius M Ouweland
- 👤 Hendricus Gerardus Peer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:45
CPC Classifications
C; C07; C07H; C07H11/00; C07H11/04; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |