Isomer enrichment process for cyclopropanecarboxylates
CA 1192218 A · Owner: Zeneca Inc. · Inventors: Hartmann, Ludwig A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of partially resolving the cis and trans isomers of a cyclopropane carboxylate by a controlled partial hydrolysis. The cis/trans distribution in the hydrolyzed product differs from that in the starting material. The cyclopropane carboxylates are known intermediates for the natural and synthethic pyrethroids, some of which exhibit a difference in pesticidal activity depending on whether the cis or trans isomers are applied.
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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 August 20, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2002.
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Timeline
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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.