Cyclohexenone compounds and their use as herbicides or plant growth regulators
CA 2027446 C · Owner: Wuerzer, Bruno · Inventors: Rademacher, Wilhelm; Wuerzer, Bruno; Westphalen, Karl-Otto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cyclohexenone compounds of the formula I where the substituents have the following meanings: R1 substituted or unsubstituted alkyl, alkenyl alkynyl, cycloalkyl, phenyl or benzyl; A ~oxygen, N-OR2, NR3;, R2 substituted or unsubstituted alkyl alkenyl, alkynyl;, R3 hydrogen, alkyl, hydroxyalkyl alkoxyalkyl, alkylthioalkyl, substituted or unsubstituted phenyl or benzyl; processes for their manufacture and their use for combating unwanted plant growth and for regulating plant growth.
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 October 12, 1990 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 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.