Herbicidal composition
CA 2045709 C · Owner: Zeneca Limited · Inventors: Heylings, Jonathan Roy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A herbicidal composition, comprising preferably an aqueous solution of a salt of paraquat or diquat, or a mixture thereof in admixture with a, gelling agent that will gel at the pH of human gastric juice (e. g. magnesium silicate), and further comprising (1) an emetic (e.g. a, triazolopyrimidine emetic) or (2) a purgative (e. g. magnesium sulphate) or (3) both an emetic and a purgative. In the event of ingestion of the composition these additives act, synergistically to reduce absorption of bipyridylium compound from the gastrointestinal tract into the bloodstream and thereby reduce the oral, toxicity of the composition.
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 June 26, 1991 and granted December 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2013.
- 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.