Preparation of bis-(aminocyclohexyl)-dialkylmethanes
CA 1192575 A · Owner: Basf Aktiengesellschaft · Inventors: Voges, Dieter; Wolff, Dietrich; Hertel, Otto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bis-(aminocyclohexyl)-dialkylmethanes of the general formula I, where R1 and R2 are identical or different and are each lower alkyl, R3 is hydrogen or lower alkyl and the two, cyclohexane rings may be unsubstituted or substituted are, prepared by a process in which a para-unsubstituted aniline is condensed with a lower aliphatic ketone in the presence of a strong acid, and the product obtained is then hydrogenated in the presence of a ruthenium-containing catalyst.
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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 August 27, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 27, 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.