Redispersible powder composition
CA 2052173 C · Owner: Hinterwinkler, Juergen · Inventors: Herold, Hardy; Hinterwinkler, Juergen; Schulze, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a redispersible powder composition comprising, a) a base polymer from the group comprising vinyl ester polymers, styrene polymers, acrylate polymers and vinyl chloride polymers, b) 2 to 15% by weight relative to the base polymer, of, polyvinyl alcohol having a degree of hydrolysis of 85 to 94 mol% and a Höppler viscosity of 2 to 25 mPa~s c) 3 to 30% by weight, relative to the total weight of polymer components, of a fine antiblocking agent d) 0.1 to 2% by weight, relative to the base polymer of antifoams, which contains, e) 1 to 8% by weight relative to the base polymer, of, a fully hydrolyzed 1-alkylvinyl ester/vinyl ester copolymer having a Höppler viscosity of 1 …
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 September 24, 1991 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 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.