Process for preparing a coating with improved resistance to yellowing and the resulting coating
CA 2116166 C · Owner: Shaffer, Myron W. · Inventors: Shaffer, Myron W.; Potter, Terry A.; Venham, Lanny D.
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 process for preparing a coated substrate having improved resistance to yellowing which comprises coating a substrate with a one-component coating composition containing a) a blocked polyisocyanate which is the reaction product of a polyisocyanate with an oxime or lactam blocking agent for isocyanate groups and, b) a compound containing at least two isocyanate-reactive groups, provided that component a) and/or component b) contains the group, -CO-(R)N-N(R)-CO-, wherein R represents hydrogen or an optionally substituted hydrocarbon radical in an amount of 0.01 to 5% by weight, based on the solids content of components a) and b), by applying the one-component …
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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 February 22, 1994 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2016.
- 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.