A process for the production of polyurethane coatings
CA 2018803 C · Owner: Pedain, Josef · Inventors: Kahl, Lothar; Nachtkamp, Klaus; Zwiener, Christian
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 process for the preparation of a polyurethane coating by coating a substrate with a coating composition containing, a) a polyisocyanate component and b) an isocyanate-reactive component containing at least one compound corresponding to the formula, (see formula I) wherein, X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100°C or less, R1 and R2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100°C or less, R3 and R4 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate …
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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 June 12, 1990 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 12, 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.
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.