Continuous process for making a dialkyltin thiocarboxylic acid ester
CA 2123359 C · Owner: Morton International Inc. · Inventors: Kolin, Kevin S.; Siegmann, Anthony J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a method for reducing fifty-fold the size of equipment required for making a given volume of alkyltin thioglycolic acid esters. In said method an alkyltin, thiocarboxylic acid ester is made from the corresponding alkyltin halide and thiocarboxylic ester in a continuous process that requires but one agitated reaction vessel. The organic reactants and an acid acceptor are added simultaneously to a reaction vessel equipped with agitator impellers and containing a sufficient level of water to provide an agitatable medium. Extremely vigorous agitation (at least about 75 turnovers per minute which is, sufficient to achieve a fluid velocity across the impeller(s) of at …
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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 May 11, 1994 and granted January 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2016.
- 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.