Patent US2684982A successfully refreshed from Google Patents.
US2684982A
Expired / Lapsed
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Recovery of levulinic acid
Assignee: Quaker Oats Co
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Filing: 1951-11-19
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Granted: 1954-07-27
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Expires: 1971-11-19
Abstract
No abstract record available.
Inventors
- 👤 Andrew P Dunlop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:15
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A PROCESS FOR RECOVERING LEVULINIC ACID FROM AN AQUEOUS SOLUTION WHICH COMPRISES EXTRACTING SAID AQUEOUS SOLUTION WITH FURFURAL.
Claim 2
Dependent Claim
18 words
A PROCESS FOR RECOVERING LEVULINIC ACID FROM AN AQUEOUS SOLUTION WHICH COMPRISES EXTRACTING SAID AQUEOUS SOLUTION WITH FURFURAL.
References Cited (Backward Citations)
US1995965A
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US2018031A
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US2165438A
Cited
CH208747A
Cited
US2255235A
Cited
US2257389A
Cited
GB583533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |