Herbicidal 3-(3,4,5,6-tetrahydrophthalimido)-cinnamic esters
CA 2016880 C · Owner: Rueb, Lothar · Inventors: Westphalen, Karl-Otto; Wuerzer, Bruno; Rueb, Lothar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-(N-3,4,5,6-Tetrahydrophthalimido)-cinnamic esters of the general formula I, (see figure I) where n is 1 or 2 and the substituents have the following meanings: R1 is hydrogen or fluorine, R2 is halogen R3 is hydrogen, halogen or C1-C4-alkyl R4 is hydrogen, substituted or unsubstituted C1-C6-alkyl C3-C7-cycloalkyl, C3-C6-alkenyl, C3-C6-alkynyl or benzyl R is C1-C4-alkyl, processes for their manufacture and herbicidal agents containing them.
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 May 16, 1990 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2012.
- 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.