Method of mixed-bed filtration and demineralization with ion-exchange resins
CA 2055206 C · Owner: Kawazu, Hideo · Inventors: Kawazu, Hideo; Izumi, Takeshi; Hagiwara, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of mixed-bed filtration and demineralization for removing suspended impurities from the primary cooling water in a power plant by means of a demineralizer having a mixed bed formed of a particulate canon and anion exchange resin that have such a surface layer structure that granules are seen to bind with one another under microscopic examination, being able to be operated in a safe and yet economical manner by virtue of established conditions for operating processes, such as regeneration of the demineralizer by backwashing and by passage of chemicals and also replacement of the demineralizer.
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 November 8, 1991 and granted April 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 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.