Process for the preparation of n-monosubstituted o- alkylurethanes
CA 1182467 A · Owner: Bayer Aktiengesellschaft · Inventors: Konig, Klaus; Heitkamper, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PROCESS FOR THE PREPARATION OF, N-MONOSUBSTITUTED O-ALKYLURETHANES ABSTRACT OF THE DISCLOSURE, N-monosubstituted O-alkylurethanes are prepared by reacting a primary amine with an N,N'-diarylurea preferably diphenylurea and a primary or secondary alcohol at a temperature from 150 to 300°C. The reactant alcohol has a boiling point which is at least 5°C higher at atmospheric pressure than the aromatic amine from which the urea is derived. The aromatic monoamine on which the urea is based which forms during the reaction is removed by distillation during the course of the reaction.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.