Polyonic transition metal catalyst composition
CA 2124187 C · Owner: Turner, Howard William · Inventors: Turner, Howard William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved ionically activated transition metal catalyst compositions which are useful in the polymerization of olefins comprise a transition metal cationic component associated with and stabilized by a polyanionic moiety comprising a plurality of metal or metalloid - containing non-coordinating anionic groups pendant from and chemically bonded to a core component.
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 November 25, 1992 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 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.