Process for preparing stabilized polymer dispersion
CA 2036422 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Antonelli, Joseph A.; Scopazzi, Christopher; Doherty, Mark M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Stabilized polymer dispersions in which the principal polymer contains a core component of acrylic polymers and stabilizer components which are polymers of ethylenically unsaturated monomers and which are grafted to the core component at the stabilizer ends can be prepared using a catalytic chain transfer agent containing Co+2.
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 February 15, 1991 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2013.
- 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.