Low sediment method for preparing copper salts of polyolefinic-substituted dicarboxylic acids
CA 2030279 C · Owner: Giffin, Gregory C. · Inventors: Giffin, Gregory C.; Evans, Joan M.; Evans, Gordon F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a low sediment method of producing oleaginous compositions captaining copper salts of the product of a polyolefin having a numerical average molecular weight (~ n) of at least 600 which has been substituted with an average of at least 0.5 dicarboxylic acid anhydride moiety per polyolefin molecule, wherein the polyolefin-substituted dicarboxylic acid anhydride is contacted with a water-soluble copper reactant in the presence of at least 1,000 wt.% above the amount theoretically required to hydrolyze the polyolefin-substituted dicarboxylic acid anhydride material charged) and in the presence of a solvent for the polyolefin-substituted dicarboxylic acid …
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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
- Filed November 19, 1990 and granted January 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.