Unsaturated carboxylic acids
CA 1086329 A · Owner: Shell Canada Limited · Inventors: Van Helden, Robert; Austermuhle-Bertola, Helena
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Unsaturated carboxylic acids of formula:in which X represents a cyano group or an alkoxycarbonyl group; and R1 and R2 each represents an alkyl group or a salt of such an acid. The compounds are intermediates for the preparation of pyrethroid-type insecticides.
Read the whole patent
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 September 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 1997.
- 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.