US3660460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing n n-bis-cyanoethylated derivatives of aliphatic primary amine branched at the alpha-position
Assignee: Toyobo Co Ltd
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Filing: 1969-08-06
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Granted: 1972-05-02
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Expires: 1989-08-06
Abstract
Abstract WHEREIN R'' AND R" ARE EACH A LOWER ALKYL GROUP OR ARE LINKED TOGETHER TO REPRESENT A LOWER ALKYLENE GROUP OR ITS N-MONOCYANOETHYLATED DERIVATIVE WITH ACRYLONITRILE IN THE PRESENCE OF AN ACIDIC CATALYST TO GIVE THE CORRESPONDING N,N-BISCYANOETHYLATED COMPOUND, WHICH IS USEFUL AS THE STARTING MATERIAL IN THE PRODUCTION OF AN EASILY DYEABLE POLYAMIDE FIBER. R''-CH(-R")-NH2 PROCESS FOR PREPARING THE N,N-BIS-CYANOETHYLATED DERIVAITIVE OF AN ALIPHATIC PRIMARY AMINE BRANCHED AT THE A-POSITION WHICH COMPRISES REACTING AN ALIPHATIC PRIMARY AMINE OF THE FORMULA:
Inventors
- 👤 Hideaki Munakata
- 👤 Kazuo Watanabe
- 👤 Akitada Osako
- 👤 Rintaro Urakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:43
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |