Polymerisation regulation
CA 2103595 C · Owner: Commonwealth Scientific And Industrial Research Organisation · Inventors: Rizzardo, Ezio; Meijs, Gordon Francis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of low molecular weight polymers by free radical polymerisation of one or more monomers in the presence of a chain transfer agent characterized in that the chain , transfer agent comprises one or more compounds of general formula (1), wherein R1 is a hydrogen atom an alkyl group, or a group capable , of activating the vinylic carbon towards free radical addition; R2 represents an optionally substituted alkyl optionally , substituted alkenyl, optionally substituted alkynyl or optionally substituted satured, unsatured or aromatic carbocyclic or heterocyclic ring; and Z represents an oxygen sul-, phur, phosphorus, or nitrogen atom bound to another atom or group …
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 January 31, 1992 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2014.
- 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.