Powder coating compositions
CA 2049837 C · Owner: Wamprecht, Christian · Inventors: Wamprecht, Christian; Kreuder, Hans-Joachim
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 powder coating compositions which are solid below 30°C and contain a mixture of, A) a copolymer component which is solid below 30°C and contains at least one copolymer containing both cyclic carboxylic anhydride groups and hydroxyl groups B) a polyepoxide component which, contains at least one polyepoxide containing at least two epoxide groups per molecule.
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 August 26, 1991 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2013.
- 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.