Process for making substituted pyrazoles
CA 2461095 A1 · Owner: Yalamanchili, Gopi · Inventors: Mcdermott, Lisa L.; Lau, Patrick H.; Mudipalli, Partha S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a process for making substituted pyrazoles (I) , tautomers of the substituted pyrazoles and salts of the substituted pyrazoles and tautomers, wherein R3A, R3B, R3C, Y1 Y2, Y3, Y4, and Y5 are as defined in , the specification. The process comprises: forming a mixture by a process comprising introducing a hydrazone (II) and an optionally-substituted benzoyl halide (III) into a reactor, and heating the mixture to a temparature of greater than 50 ~C (II); and (III).
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 September 25, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2024.
- 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.