US2623060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylidenecyanoacetates and improved process for preparation thereof
Assignee: Sharp and Dohme Inc
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Filing: 1949-11-04
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Granted: 1952-12-23
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Expires: 1969-11-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward J Cragoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:02
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A PROCESS FOR THE PRODUCTION OF ALKYLIDENECYANOACETATES COMPRISING REFLUXING AND CONTINUOUSLY REMOVING WATER FROM A MIXTURE COMPRISING A KETONE SELECTED FROM THE CLASS CONSISTING OF ARYL ALKYLKETONES AND DIARYL KETONES IN WHICH THE ARYL NUCLEUS CONTAINS LESS THAN 11 CARBON ATOMS, DIALKYL AND CYCLOALIPHATIC KETONES CONTAINING A TERTIARY ALKYL RADICAL ATTACHED TO THE CARBONYL GROUP, DIARALKYL KETONES AND KETONES CONTAINING AT LEAST ONE HETEROCYCLIC RADICAL CHOSEN FROM THE CLASS CONSISTING OF THIENYL AND FURFURYL, WITH A CYANOACETATE, ACETIC ACID, A SOLVENT CAPABLE OF REMOVING WATER, AMMONIUM ACETATE CATALYST, ADDING THERETO PORTIONS OF CATALYST AT INTERVALS UPON DIMINISHED WATER EVOLUTION RATE UNTIL A RELATIVELY CONSTANT, DIMINISHED RATE OF WATER EVOLUTION EVIDENCES COMPLETION OF THE REACTION AND RECOVERING THE ALKYLIDENECYANOACETATE FROM THE MIXTURE.
Claim 2
Dependent Claim
121 words
A PROCESS FOR THE PRODUCTION OF ALKYLIDENECYANOACETATES COMPRISING REFLUXING AND CONTINUOUSLY REMOVING WATER FROM A MIXTURE COMPRISING A KETONE SELECTED FROM THE CLASS CONSISTING OF ARYL ALKYLKETONES AND DIARYL KETONES IN WHICH THE ARYL NUCLEUS CONTAINS LESS THAN 11 CARBON ATOMS, DIALKYL AND CYCLOALIPHATIC KETONES CONTAINING A TERTIARY ALKYL RADICAL ATTACHED TO THE CARBONYL GROUP, DIARALKYL KETONES AND KETONES CONTAINING AT LEAST ONE HETEROCYCLIC RADICAL CHOSEN FROM THE CLASS CONSISTING OF THIENYL AND FURFURYL, WITH A CYANOACETATE, ACETIC ACID, A SOLVENT CAPABLE OF REMOVING WATER, AMMONIUM ACETATE CATALYST, ADDING THERETO PORTIONS OF CATALYST AT INTERVALS UPON DIMINISHED WATER EVOLUTION RATE UNTIL A RELATIVELY CONSTANT, DIMINISHED RATE OF WATER EVOLUTION EVIDENCES COMPLETION OF THE REACTION AND RECOVERING THE ALKYLIDENECYANOACETATE FROM THE MIXTURE.
Claim 3
Dependent Claim
8 words
A COMPOUND CHOSEN FROM THE CLASS CONSISTING OF
Claim 4
Dependent Claim
8 words
A COMPOUND CHOSEN FROM THE CLASS CONSISTING OF
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |