Abrasion resistant polyurethane blend compositions
CA 2016189 C · Owner: Gencorp Inc. · Inventors: Chihara, Kohji Y.; Lenke, Gerd M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a primerless one-part, storage stable, fast heat curable abrasion-resistant coating composition useful as a low friction coating for EPDM glass run channels in vehicles or similar applications. The coating composition comprises a blocked polyurethane, a coreactive crosslinking agent, and a compatible silicone oil. The blocked polyurethane is desirably made from a hydroxyl terminated hydrogenated diene polymer or polyolefin which, is reacted with excess equivalents of a polyisocyanate reactant and the free isocyanate groups blocked with a blocking agent.
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 May 7, 1990 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.