US2537814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acetone cyanohydrin
Assignee: Wyeth Holdings LLC
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Filing: 1949-01-14
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Granted: 1951-01-09
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Expires: 1969-01-14
Abstract
No abstract record available.
Inventors
- 👤 Harold S Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:14
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A PROCESS FOR THE PREPARATION OF ACETONE CYANOHYDRIN WHEREIN ACETONE, HCN, AND AN ALKALINE CATALYST ARE FIRST REACTED AT A TEMPERATURE HIGH ENOUGH FOR REMOVAL OF THE GREATER PART OF THE HEAT OF REACTION BY COOLING WATER UNTIL AN EQUILIBRIUM MIXTURE COMPRISING ACETONE CYANOHYDRIN IS SUBSTANTIALLY OBTAINED, SAID MIXTURE IS SUBSEQUENTLY MAINTAINED AT A LOWER TEMPERATURE UNTIL A NEW EQUILIBRIUM MIXTURE IS SUBSTANTIALLY OBTAINED CONTAINING A HIGHER PROPORTION OF ACETONE CYANOHYDRIN, AND SAID LETTER MIXTURE IS ACIDIFED, WHEREBY THE EFFECTIVENESS OF SAID CATALYST IS DESTROYED AND REVERSAL OF THE REACTION IS SUBSTANTIALLY PREVENTED, THE IMPROEMENT WHICH CONSISTS IN SELECTIVELY FREEZING SAID ACETONE CYANOHYDRIN IN SAID MIXTURE FOR AT LEAST 15 MINUTS IMMEDIATELY PRIOR TO SAID ACIDIFICATION.
Claim 2
Dependent Claim
117 words
IN A PROCESS FOR THE PREPARATION OF ACETONE CYANOHYDRIN WHEREIN ACETONE, HCN, AND AN ALKALINE CATALYST ARE FIRST REACTED AT A TEMPERATURE HIGH ENOUGH FOR REMOVAL OF THE GREATER PART OF THE HEAT OF REACTION BY COOLING WATER UNTIL AN EQUILIBRIUM MIXTURE COMPRISING ACETONE CYANOHYDRIN IS SUBSTANTIALLY OBTAINED, SAID MIXTURE IS SUBSEQUENTLY MAINTAINED AT A LOWER TEMPERATURE UNTIL A NEW EQUILIBRIUM MIXTURE IS SUBSTANTIALLY OBTAINED CONTAINING A HIGHER PROPORTION OF ACETONE CYANOHYDRIN, AND SAID LETTER MIXTURE IS ACIDIFED, WHEREBY THE EFFECTIVENESS OF SAID CATALYST IS DESTROYED AND REVERSAL OF THE REACTION IS SUBSTANTIALLY PREVENTED, THE IMPROEMENT WHICH CONSISTS IN SELECTIVELY FREEZING SAID ACETONE CYANOHYDRIN IN SAID MIXTURE FOR AT LEAST 15 MINUTS IMMEDIATELY PRIOR TO SAID ACIDIFICATION.
References Cited (Backward Citations)
US2101823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |