Patent US2763665A successfully refreshed from Google Patents.
US2763665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of levulinic acid esters
Assignee: Howards of Ilford Ltd
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Filing: 1952-07-28
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Granted: 1956-09-18
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Expires: 1972-07-28
Abstract
No abstract record available.
Inventors
- 👤 Lock Ritchie Hart
- 👤 Reynolds Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:33
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/39; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A PROCESS FOR THE MANUFACTURE OF LEVULINIC ACID ESTERS, WHICH COMPRISES HEATING FURFURYL ALCOHOL AT A TEMPERATURE WITHIN THE RANGE OF 64* C. TO 200* C. WITH A DIFFERENT ALCOHOL SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED PRIMARY AND SECONDARY CARBON CHAIN AND OXYGEN-CARBON CHAIN ALIPHATIC AND CARBON RING AND OXYGEN-CARBON RING CYCLOALIPHATIC ALCOHOLS CONTAINING FROM 1 TO 10 CARBON ATOMS UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS WITH AGITATION IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN BROMIDE, AND GRADUALLY ADDING THE FURFURYL ALCOHOL TO THE OTHER ALCOHOL AT A RATE SUCH THAT AT NO TIME DOES THE AMOUNT OF UNREACTED FURFURYL ALCOHOL PRESENT EXCEED 2 PER CENT BY VOLUME OF THE OTHER ALCOHOL, AND USING ALCOHOL THAN 4 MOLECULAR PROPORTIONS OF THE SAID OTHER ALCOHOL PER MOLECULAR PROPORTION OF THE FURFURYL ALCOHOL USED.
Claim 2
Dependent Claim
140 words
A PROCESS FOR THE MANUFACTURE OF LEVULINIC ACID ESTERS, WHICH COMPRISES HEATING FURFURYL ALCOHOL AT A TEMPERATURE WITHIN THE RANGE OF 64* C. TO 200* C. WITH A DIFFERENT ALCOHOL SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED PRIMARY AND SECONDARY CARBON CHAIN AND OXYGEN-CARBON CHAIN ALIPHATIC AND CARBON RING AND OXYGEN-CARBON RING CYCLOALIPHATIC ALCOHOLS CONTAINING FROM 1 TO 10 CARBON ATOMS UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS WITH AGITATION IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN BROMIDE, AND GRADUALLY ADDING THE FURFURYL ALCOHOL TO THE OTHER ALCOHOL AT A RATE SUCH THAT AT NO TIME DOES THE AMOUNT OF UNREACTED FURFURYL ALCOHOL PRESENT EXCEED 2 PER CENT BY VOLUME OF THE OTHER ALCOHOL, AND USING ALCOHOL THAN 4 MOLECULAR PROPORTIONS OF THE SAID OTHER ALCOHOL PER MOLECULAR PROPORTION OF THE FURFURYL ALCOHOL USED.
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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |