Expired Canadian patentCanada
5-amino-1-phenyl-pyrazole-4-carboxylic acid derivatives and their use for controlling undesirable plant growth
CA 1182452 A · Owner: Basf Aktiengesellschaft · Inventors: Plath, Peter; Eicken, Karl; Wuerzer, Bruno
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
or the Disclosure: 5-amino-1-phenyl-pyrazole-4carboxylic acid derivatives of the formula uhere R1, R2, R3 and A have the meanings given in the description, are used for controlling undesirable plant growth.
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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
- Granted February 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 2002.
- 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 21, 1982
GrantedFebruary 12, 1985
Term endedFebruary 12, 2002
Patent numberCA 1182452 A
Classification (IPC)C07D231/38 +1 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.