Purification of chlor-alkali membrane cell brine
CA 2029689 C · Owner: Texas Brine Corporation · Inventors: Rutherford, John; Ver Hoeve, Raymond W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to methods and, systems for purifying brine for electrolysis in chloralkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesirable ions such as calcium and chlorate. The methods and systems employed are unique combinations of refrigeration and crystallization, and brine recirculation techniques in the systems for electrolyzing brine.
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 9, 1990 and granted January 26, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2012.
- 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.