Process for the preparation of pyrazole
CA 1164878 A · Owner: Bayer Aktiengesellschaft · Inventors: Ditgens, Klaus; Lantzsch, Reinhard; Heinemann, Ulrich
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 pyrazole Process for the preparation of pyrazole by heating a pyrazoline derivative of the general formula (I), in which, R represents an optionally substituted phenyl radicals or an alkyl or halogeno= alkyl radical, without the addition of an acid or base at a tempera-, ture between 100 and 200°C under a pressure between 1 mbar and 10 bars r optionally in the presence of a diluent. Le A 20 592
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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 April 3, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 2001.
- 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.