Benzimidazole anthelmintics
CA 2113567 C · Owner: Pfizer Limited · 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
A benzimidazole anthelmintic agent of formula (I) or a non-toxic salt thereof wherein R1, which is in the 5- or 6-, position is either (i) benzoyl, phenyloxy, phenylthio phenylsulfinyl, phenylsulfonyl, phenylsulfonyloxy C1-C6 alkyl, C1-C6, alkoxy, C1-C6 alkylthio C1-C6 alkylsulfinyl, C1-C6 alkylsulfonyl or (C3-C7 cycloa1kyl)carbonyl said phenyl groups, and the, phenyl portion of said benzoyl group optionally having 1 to 3 substituents each independently selected from halo C1-C4, alkyl, halo-(C1-C4 alkyl), C1-C4 alkoxy C1-C4 alkylthio, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl C2-C4 alkanoyl, nitro, isothiocyanato, and cyano; or (ii) a group of formula (a) where X is O, S, SO, SO2 or NR4 in …
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 13, 1992 and granted November 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 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.