Mixtures of aqueous polymer dispersions
CA 2033740 C · Owner: Bayer Aktiengesellschaft · Inventors: Ganster, Otto; Konigshofen, Heinrich; Witkowski, Reiner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a novel adhesive which is a mixture of, A) at least one aqueous dispersion of a polymer which has a softening point below 70°C said, dispersion containing 5 to 70% by weight solids and having a film-forming temperature below 70°C, and, B) at least one aqueous dispersion of a polymer based on olefinically unsaturated monomers having a softening point is above 70°C said, dispersion containing 5 to 70% by weight solids wherein the weight ratio of dispersion A) to dispersion B) is from 97:3 to 60:40, based on the solids content of said dispersions.
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 7, 1991 and granted March 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 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.