Acrylic emulsions prepared in the presence of fully hydrolyzed poly (vinyl alcohol)
CA 2207363 C · Owner: Bott, Richard Henry · Inventors: Distefano, Frank Vito; Bott, Richard Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is an emulsion composition comprised of acrylic ester monomers polymerized in the presence of fully hydrolyzed poly(vinyl alcohol) or a partially, hydrolyzed poly(vinyl alcohol) provided the molecular weight of the low molecular weight, poly(vinyl alcohol) is from 5,000 to 13,000 as the only stabilizer and a chain transfer, agent. The improvement over the known prior art is the ability to incorporate fully, hydrolyzed poly(vinyl alcohol) without the need for other surfactants or special, processing.
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 June 9, 1997 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2019.
- 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.