US3591639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of amines from n-substituted amides
Assignee: Armour Industrial Chemical Co
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Filing: 1967-11-02
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Granted: 1971-07-06
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Expires: 1987-11-02
Abstract
Abstract A PROCESS FOR PREPARATION OF PRIMARY AND SECONDARY AMINES COMPRISING REACTING AN N-SUBSTITUTED AMIDE WITH AMMONIA AT AN ELEVATED TEMPERATURE FORMING AN AMINE AND UNSUBSTITUTED AMIDE WHICH IN THE PRESENCE OF A CATALYST DEHYDRATES THE UNSUBSTITUTED AMIDE TO A NITRILE. THE AMINES FORMED BY THIS REACTION ARE USEFUL AS MINERAL FLOTATION AGENTS, BIOCIDES, AND AS INTEREMEDIATES TO FORM SURFACE ACTIVE CHEMICALS AND NITROGEN DERIVATIVE COMPOUNDS SUCH AS DIAMINES, QUATERNARY AMMONIUM COMPOUNDS AND THE LIKE.
Inventors
- 👤 Harlan E Tiefenthal
- 👤 Eugene J Miller Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:50
CPC Classifications
G; G09; G09B; G09B27/00; G09B27/08
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |