Patent US2648649A successfully refreshed from Google Patents.
US2799697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture and purification of malononitrile
Assignee: Chase Chemical Co LP
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Filing: 1954-09-15
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Granted: 1957-07-16
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Expires: 1974-09-15
Abstract
No abstract record available.
Inventors
- 👤 Emil J Maxion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:31
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PREPARATION OF MALONONITRILE WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY OF CYANOACETAMIDE WITH A DEHYDRATING AGENT SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS OXYCHLORIDE, PHOSPHORUS PENTACHLORIDE, AND MIXTURES THEREOF IN AN INERT ORGANIC SOLVENT AND IN THE PRESENCE OF AN INORGANIC SULFITE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM SULFITES AND BISULFITES, AND RECOVERING THE MALONONITRILE THUS FORMED, THE DEHYDRATING AGENT BEING EMPLOYED IN AT LEAST THE THEORETICALLY REQUIRED PROPORTIONS BUT NO MORE THAN ABOUT 1.25 MOLES FOR EACH TWO MOLES OF CYANOACETAMIDE.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PREPARATION OF MALONONITRILE WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY OF CYANOACETAMIDE WITH A DEHYDRATING AGENT SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS OXYCHLORIDE, PHOSPHORUS PENTACHLORIDE, AND MIXTURES THEREOF IN AN INERT ORGANIC SOLVENT AND IN THE PRESENCE OF AN INORGANIC SULFITE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM SULFITES AND BISULFITES, AND RECOVERING THE MALONONITRILE THUS FORMED, THE DEHYDRATING AGENT BEING EMPLOYED IN AT LEAST THE THEORETICALLY REQUIRED PROPORTIONS BUT NO MORE THAN ABOUT 1.25 MOLES FOR EACH TWO MOLES OF CYANOACETAMIDE.
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) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |