Expired Canadian patentCanada
Process for the preparation of dialkyl 2- vinylcyclopropane-1,1-dicarboxylates
CA 1295623 C · Owner: Quantum Chemical Corporation · Inventors: Clark, Clarence E. Jr.; Fayter, Richard G. Jr.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to the preparation of dialkyl-2-vinylcyclopropane-1,1-dicarboxylates involving the addition of an alcoholic metallic alkoxide to an organic solution of a 1,4-dihalobutene-2 and a malonic ester.
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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 11, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 11, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 23, 1987
GrantedFebruary 11, 1992
Term endedFebruary 11, 2009
Patent numberCA 1295623 C
Classification (IPC)C07C69/74
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.