Process for preparing a mixture of amino-methyl-cyclohexanes and diamino-methyl-cyclohexanes
CA 2201236 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Petruck, Gerd-Michael; Darsow, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
For the continuous preparation of a mixture of amino-methyl-cyclohexanes and diamino-methyl-cyclohexanes by catalytic hydrogenation of diamino-toluenes with hydrogen at temperatures of from 150 to 260~C and an H2 pressure of from 20 to 500 bar, use is made of reduced support-free catalysts which are produced from pressed powders of cobalt, manganese, copper and alkaline earth metal (hydr)oxides, with or without a content of at least one (hydr)oxide of metals oftransition group V and/or VI of the Periodic Table of the Elements (Mendeleev).
Read the whole patent
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
- Filed March 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- 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.