Benzimidazole anthelmintic agents
CA 2120616 C · Owner: Goudie, Alexander Crossan · Inventors: Goudie, Alexander Crossan; Banks, Bernard Joseph; Dutton, Christopher James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Benzimidazole anthelmintic agents of the formula (I) and their non-toxic salts wherein R1, which is in the 5(6)-position,is either H or certain stated substituents "alk" is a methylene or ethylene group; R2 is cyano C2-C4 alkenyl, C2-C4 alkynyl, C2-C4 alkanoyl C1-C4 alkoxy, C2-C4 alkenoxy, aryl, heteroaryl aryl-(C1-C4 alkoxy) or heteroaryl-(C1-C4 alkoxy) in which, "aryl" means phenyl optionally substituted by 1 to 3 substituents each independently selected from halo C1-C4 alkyl, C1-C4, alkoxy, C1-C4 alkithio C1-C4 alkylsulphinyl, and C1-C4 alkylsulphonyl in which "heteroaryl" means thienyl furyl or, pyridininyl all optionally substituted by 1 to 3 substituents each independently selected …
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 November 4, 1992 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 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.