The use of polyaspartic acid salts as a grinding agent
CA 2226642 C · Owner: Suau, Jean-Marc · Inventors: Mongoin, Jacques; Suau, Jean-Marc; Jacquemet, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention involves the use of polyaspartic acid salts as a grinding agent to produce aqueous suspensions of refined mineral matter which can be pumped deposit no sediment and are highly concentrated in mineral matter; it includes the grinding process which uses the agent in question the aqueous suspensions of mineral matter obtained and their application to the paper industry.
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 February 13, 1998 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2020.
- 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.