Expired Canadian patentCanada
Process for the preparation of 4-halo-3-oxo-2-alkoxy- iminobutyric esters
CA 1333720 C · Owner: Ritter, Eberhard · Inventors: Krieg, Claus-Peter; Ritter, Eberhard; Keil, Detlev
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of 4-halo-3-oxo-2-alkoxyiminobutyric esters by solvent-free halogenation of the liquid substrate of a 3-oxo-2-alkoxyiminobutyric ester with elemental halogen.
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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 December 27, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 27, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 23, 1989
GrantedDecember 27, 1994
Term endedDecember 27, 2011
Patent numberCA 1333720 C
Classification (IPC)C07C249/12 +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.