Purification of waste streams
CA 2104692 C · Owner: Saugier, Richard Kent · Inventors: Saugier, Richard Kent; Weibel, Albert Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a process for decreasing the concentration of organic carbon in an aqueous system by incorporating a peroxygen composition as an oxidant capable of oxygen transfer in a chemical reaction. The process is particularly useful for decolorizing lignin-containing aqueous solutions such as effluents from a pulp mill.
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 January 10, 1992 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 2014.
- 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.