Dipyrazoles useful as bronchodilators
CA 1324607 C · Owner: Merrell Dow Pharmaceuticals Inc. · Inventors: Peet, Norton P.; Le Tourneau, Michael E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A group of variously methyl-substituted benzo1,2-c:3,4-c'dipyrazoles, cyclohepta1,2-c:3,4-c'dipyrazoles and, cyclopenta1,2-c:3,4-c'dipyrazoles useful as bronchodilators are described herein. The compounds are prepared by reacting a 1,3-diketone with hydrazine or methylhydrazine to give tricyclic products optionally followed by catalytic dehydrogenation and/or alkylation with a strong base and methyl iodide to give various other compounds within the scope of the invention.
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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 November 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 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.