US2802857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of malononitrile
Assignee: Kay-Fries Chemicals Inc
•
Filing: 1955-11-17
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Granted: 1957-08-13
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Expires: 1975-11-17
Abstract
No abstract record available.
Inventors
- 👤 Kesslin George
- 👤 Nicholl Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:38
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A METHOD FOR THE PRODUCTION OF MALONONITRILE, WHICH COMPRISES REACTING CYANOACETAMID WITH A DEHYDRATING AGENT SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS OXYCHLORIDE, PHOSPHORUS PENTOXIDE, PHOSPHORUS PENTACHLORIDE AND ADMIXTURES THEREOF IN AN INERT SOLVENT CONTAINING A SOLID ADSORBENT, UNDER THE INFLUENCE OF HEAT AT THE REFLUX TEMPERATURE OF THE SOLVENT.
Claim 2
Independent Claim
50 words
A METHOD FOR THE PRODUCTION OF MALONONITRILE, WHICH COMPRISES REACTING CYANOACETAMID WITH A DEHYDRATING AGENT SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS OXYCHLORIDE, PHOSPHORUS PENTOXIDE, PHOSPHORUS PENTACHLORIDE AND ADMIXTURES THEREOF IN AN INERT SOLVENT CONTAINING A SOLID ADSORBENT, UNDER THE INFLUENCE OF HEAT AT THE REFLUX TEMPERATURE OF THE SOLVENT.
References Cited (Backward Citations)
US2389217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |