Carboxy-functional crosslinkers for epoxy-functional powder-lacquer binding agents
CA 2471636 C · Owner: Guertler, Christoph · Inventors: Grahl, Michael; Rawlins, James; Guertler, Christoph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the use of special mixtures of at least two polycarboxylic acids as crosslinker components for thermally curing powder-lacquer binding agents having groups that are capable of reacting with carboxyl groups. The mixtures include at least two polycarboxylic acids each melting above 95 °C and having up to 20 carbon atoms and consist of at least 5 wt.% of the polycarboxylic acid with the lowest melting point and at least 10 wt.% of the polycarboxylic acid with the highest melting point of all polycarboxylic acids present in the mixture to at least 5 wt.%. Additionally the polycarboxylic acid mixture is a solid below 40 °C and a liquid above 160°C.
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 June 21, 2004 and granted September 4, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 21, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2026.
- 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.