Expired Canadian patentCanada
Monoclinic metazachlor and its preparation
CA 2022133 C · Owner: Keil, Michael · Inventors: Synnatschke, Gotthard; Wigger, August; Ziegler, Hans
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Monoclinic 2-chloro-(2',6'-, dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula (see formula I), which melts at 76°C. Processes far its preparation and herbicides.
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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 27, 1990 and granted September 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 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.
FiledJuly 27, 1990
GrantedSeptember 19, 2000
Term endedJuly 27, 2010
Patent numberCA 2022133 C
Classification (IPC)C07D231/12 +2 more
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.