Perchlorate removal process
CA 2175053 C · Owner: Thiokol Corporation · Inventors: Mower, Glenn L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A process for removing perchlorate ions from waste water using KCl is disclosed. In the process waste perchlorate is concentrated, by water evaporation in a stripping tower. Ammonia and volatile organics are removed during the concentrating step. Potassium chloride (KCl) is added to the concentrated perchlorate solution to form potassium perchlorate (KClO4) and the reaction mixture is cooled to effect crystallization of the potassium perchlorate. The crystallization liquor is removed by centrifuge or filter press and may be further treated as part of an overall waste water treatment system.
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.
Why it's free to use
- Filed September 28, 1994 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2016.
- 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.