N-aryl-nitrogen heterocycles
CA 2083071 A1 · Owner: Schallner, Otto · Inventors: Schmidt, Robert R.; Schallner, Otto; Santel, Hans-Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
N-Aryl-nitrogen heterocycles, A b s t r a c t The invention relates to new N-aryl-nitrogen heterocycles of the general formula (I), (I), . in which R1 represents hydrogen or halogen, R2 represents one of the radicals ; , or , R3 represents hydrogen and, R4 represents alkyl or halogenoalkyl or, R3 and R4 together represent a divalent alkanediyl radical and, Le A 28 809, R5 represents an in each case straight-chain or branched radical from the series comprising alkyl alkenyl, alkinyl, halogenoalkyl or cycloalkyl where, R6 represents hydrogen or alkyl R7 represents an in each case optionally substituted radical from the series comprising alkyl alkenyl or cycloalkyl;, R8 represents hydrogen or …
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 December 1, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2014.
- 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.