In-situ treatment system for inhibiting the formation of, and for alleviating, acidity in water
CA 2098511 C · Owner: Enpar Technologies Inc. · Inventors: Chesworth, Ward; Shelp, Barry Jess; Shelp, Gene Sidney
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Treatment is described for acidity caused by water seeping down through a seam of acid-generating mineral such as pyrite. The pyrite oxidises through exposure to the atmosphere (as a result of mine workings). The treatment system creates an electrolytic cell using the submerged portion of the pyrite seam as the cathode the, water in the aquifer as the electrolyte and a body of scrap iron, immersed in the water as the (sacrificial) anode. Contact rods are inserted into the pyrite seam, and are connected via a cable, to, the body of scrap iron which is placed in a nearby pond. Hydrogen ions migrating to the cathode bubble off as hydrogen gas thereby, raising the pH. The acid generating …
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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 16, 1993 and granted July 31, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2015.
- 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.