Process for treatment of contaminated wastewater or groundwater
CA 2097327 A1 · Owner: Van Luong, Cuong · Inventors: Van Luong, Cuong; Bircher, Keith G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided for treating aqueous waste or groundwater contaminated with nitro-containing organic chemicals to degrade the compound sufficiently to permit disposal of the waste or groundwater, said process comprising the steps of (a) adjusting the pH in the range of ± 3 pH units from the pKa of said compound and (b) treating said waste or groundwater with at least one hydroxyl radical generating agent (e.g. ozone).
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 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 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.