US2855428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of amino nitriles
Assignee: Hampshire Chemical Corp
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Filing: 1956-10-25
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Granted: 1958-10-07
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Expires: 1976-10-25
Abstract
No abstract record available.
Inventors
- 👤 John J Singer
- 👤 Weisberg Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:05
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF PREPARING AMINE NITRILES WHICH COMPRISES ESTABLISHING AND MAINTAINING A LIQUID PHASE REACTION MEDIUM CONTAINING FORMALDEHYDE AND LIQUID HYDROGEN CYANIDE, MAINTAINING THE PH OF SAID MEDIUM AT A STRONG ACID LEVEL, AND INTRODUCING AMINE HAVING A REPLACEABLE HYDROGEN THERETO AT A RATE SUCH THAT ALL THE AMINE INTRODUCED IS SUBSTANTIALLY IMMEDIATELY REACTED, THEREBY TO FORM THE CORRESPONDING ACETO NITRILE AND SEPARATING THE ACETO NITRILE WHICH IS FORMED.
Claim 2
Independent Claim
69 words
THE METHOD OF PREPARING AMINE NITRILES WHICH COMPRISES ESTABLISHING AND MAINTAINING A LIQUID PHASE REACTION MEDIUM CONTAINING FORMALDEHYDE AND LIQUID HYDROGEN CYANIDE, MAINTAINING THE PH OF SAID MEDIUM AT A STRONG ACID LEVEL, AND INTRODUCING AMINE HAVING A REPLACEABLE HYDROGEN THERETO AT A RATE SUCH THAT ALL THE AMINE INTRODUCED IS SUBSTANTIALLY IMMEDIATELY REACTED, THEREBY TO FORM THE CORRESPONDING ACETO NITRILE AND SEPARATING THE ACETO NITRILE WHICH IS FORMED.
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |