Aqueous polyurethane resin dispersion, processes for its preparation, and its use in aqueous coating compositions
CA 2104845 A1 · Owner: Patzschke, Hans-Peter · Inventors: Patzschke, Hans-Peter; Schubert, Walter; Lenhard, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous coating composition which is selfdrying or is crosslinked by external agents processes, and dispersions for its preparation and its use. The coating composition comprises:, I) 40 to 100% by weight of a film-former in the form of an aqueous dispersion of one or more polyurethane resins having a number-average molecular mass (Mn) of from 2500 to 1,000,000 and a content of ionic groups, groups which can be converted to ionic groups, and/or hydrophilic groups of from 5 to 200 meq per 100 g of solid resin, and at least one CM-acid group per molecule and a OH-number of 0 to 100 wherein some or all of the Ch-acid groups can be reacted with one ore more compounds which are able to react …
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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 August 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 2015.
- 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.