Two-stage subcritical-supercritical wet oxidation
CA 2095803 A1 · Owner: Lehmann, Richard W. · Inventors: Copa, William M.; Lehmann, Richard W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-stage wet oxidation process for COD removal from high strength wastewater is disclosed. The wastewater stream is treated in a first stage subcritical wet oxidation zone at temperatures between about 250° and 374°C to remove a substantial portion of the COD. Subsequently all or a, portion of the first stage oxidized waste stream is treated in a second stage supercritical wet oxidation zone at temperatures of 374° to about 600°C to remove any remaining COD content. Both stages of wet oxidation treatment are carried out at essentially the same system pressure.
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 May 7, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 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.