Crystalline phenylacetate enantiomer pair, and preparation of a pesticidal enantiomer pair
CA 1231718 A · Owner: Shell Canada Limited · Inventors: Petty, Walter L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pesticidal phenylacetate rich in the Y enantiomer pair is prepared by precipitating the novel intermediate crystalline phenylacetate X enantiomer pair in the presence of crystals of phenylacetate X from a solution of racemic phenylacetate and recovering the filtrate rich in the Y enantiomer pair. The phenylacetate X crystals are redissolved epimerized and the, resulting racemate recycled to improve the yield of phenylacetate Y enantiomer pair.
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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 January 19, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 19, 2005.
- 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.