Substituted pyrroles
CA 2046801 C · Owner: Davis, Peter D. · Inventors: Davis, Peter D.; Hill, Christopher H.; Lawton, Geoffrey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula, (See formula I) wherein R1 and R3 together form a bond and R2 represent hydrogen or R1 and R2 together form a bond and R3 represents hydrogen; R4, R5, R6 and R7 each independently represent hydrogen, halogen, alkyl, haloalkyl alkoxy, vitro, amino, alkanoylamino, aroylamino alkylthio or alkyl-, sulphonyl; R8 represents hydrogen alkyl or aralkyl; X, represents -N(R9)- or -CHN(R10,R11)- in which R9 R10 and, R11 each represent hydrogen, alkyl aralkyl or alkanayl; m, stands for 0-2 and n stands for 1-3 with the proviso that, the sum of m and n is 1-3; p stands fa 0-4 and q stands for 0-4, with the proviso that the sum of p and q is 2-4 when X represents -N(R9)-, that …
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 July 11, 1991 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2013.
- 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.