Pyridazinone manufacture
CA 1316536 C · Owner: Avecia Limited · Inventors: Yelland, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved method for the manufacture of plant regulant pyridazine-4-one carboxylic acids which comprises the step of diazo-coupling a benzenediazonium salt with a dialkyl, 3-oxoglutarate in the presence of water and a dispersing agent, preferably at a temperature not greater than 5°C.
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
- Granted April 20, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 20, 2010.
- 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.