Terminators for anionic polymerizations
CA 2011925 C · Owner: Marchand, Gary R. · Inventors: Rose, Warren Ronald; Marchand, Gary R.; Walther, Brian W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing polymers by means of the anionic polymerization of polymerizable monomers comprising contacting one or more anionically polymerizable monomers with an alkalimetal-containing anionic initiator under anionic polymerization condition characterized by terminating the polymerization by contacting the reaction mixture with an inorganic acid selected from sulfuric acid, phosphoric acid and mixtures thereof.
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
- Filed March 12, 1990 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.
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.