Powder coating compositions
CA 2068170 C · Owner: Pedain, Josef · Inventors: Pedain, Josef; 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 coating compositions in pulverulent form which are solid below 30°C and liquid above 150°C and contain, A) 10 to 99 parts by weight of a copolymer component containing at least one copolymer which is prepared from olefinically unsaturated compounds, has a weight average molecular weight of 1500 to 75,000 and contains in chemically bound form, (i) 1 to 30% by weight of cyclic carboxylic acid anhydride groups (calculated as C4H2O3) and (ii) 0.3 to 10% by weight of epoxide groups (calculated as C2H3O), and, B) 1 to 90 parts by weight of a polyol component containing at least one organic polyol having at least two hydroxyl groups per molecule, provided that for …
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, 1992 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2014.
- 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.