US2768976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing tetraacetals of
Assignee: —
•
Filing: —
•
Granted: 1956-10-30
•
Expires: 1973-10-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:24
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/48; C07C41/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE METHOD OF PRODUCING TETRAACETALS OF BUTENEDIAL, WHICH COMPRISES REACTING FURAN WITH A HALOGEN AND AN ALCOHOL CORRESPONDING TO THE ACETAL TO BE PRODUCED, UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND AT A TEMPERATURE NOT ABOVE -25* C., NEUTRALIZING THE RESULTING REACTION MIXTURE WITH AN ALKALINE NEUTRALIZING AGENT WHILE THE TEMPERATURE OF THE REACTION MIXTURE IS BETWEEN -25* C. AND ABOUT 0* C. UNTIL THE PH OF THE REACTION MIXTURE REACHES A VALUE BETWEEN 6.0 AND 7.5, AND SEPARATING THE BUTENEDIAL-TETRAACETAL FORMED THEREBY FROM THE NEUTRALIZED REACTION MASS.
Claim 2
Independent Claim
86 words
THE METHOD OF PRODUCING TETRAACETALS OF BUTENEDIAL, WHICH COMPRISES REACTING FURAN WITH A HALOGEN AND AN ALCOHOL CORRESPONDING TO THE ACETAL TO BE PRODUCED, UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND AT A TEMPERATURE NOT ABOVE -25* C., NEUTRALIZING THE RESULTING REACTION MIXTURE WITH AN ALKALINE NEUTRALIZING AGENT WHILE THE TEMPERATURE OF THE REACTION MIXTURE IS BETWEEN -25* C. AND ABOUT 0* C. UNTIL THE PH OF THE REACTION MIXTURE REACHES A VALUE BETWEEN 6.0 AND 7.5, AND SEPARATING THE BUTENEDIAL-TETRAACETAL FORMED THEREBY FROM THE NEUTRALIZED REACTION MASS.
References Cited (Backward Citations)
US2556312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |