Post-extended anionic polyurethane dispersion
CA 2083058 C · Owner: Budde, Anna M. · Inventors: Budde, Anna M.; Salatin, Timothy D.
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 an aqueous anionic polyurethane dispersion, obtainable by a) dispersing a polyurethane resin, having carboxylic said groups, in water in the presence of a tertiary amine and b) reacting the carboxylic acid groups oh the polyurethane resin with an organic compound having at least two oxirane groups, a basecoat containing said dispersions a method of coating a substrate with said basecoat and a coated substrate,
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 March 23, 1992 and granted May 27, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 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.