US2780588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of levulinic acid
Assignee: Quaker Oats Co
•
Filing: 1954-12-08
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Granted: 1957-02-05
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Expires: 1974-12-08
Abstract
No abstract record available.
Inventors
- 👤 Andrew P Dunlop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/50
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
A CONTINUOUS PROCESS FOR THE RECOVERY OF LEVULINIC ACID FROM A SOLUTION CONTAINING LEVULINIC ACID AND A NONAQUEOUS SOLVENT WHICH COMPRISES CONTINUOUSLY PASSING SAID SOLUTION INTO A FRACTIONATION ZONE, CONCOMITANTLY AND CONTINUOUSLY PASSING WATER IN SAID ZONE, AND RECTIFLYING SAID SOLUTION AND WATER MIXTURE WHEREBY A BOTTOMS CONCENTRATE CONTAINING ESSENTIALLY LEVULINIC ACID AND WATER IS FORMED.
References Cited (Backward Citations)
US2257389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |