Method for treatment of waste water
CA 2362329 A1 · Owner: Smith, George A. · Inventors: Smith, George A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention concerns a method for the treatment of waste-water. This method includes reacting a polyamine and a multifunctional epoxide in waste-water composition that initially is in the form of an emulsion to form a reaction product that causes the emulsion to break into a water phase and an oil phase. The oil phase and water phase may thereafter be physically separated from one another as by dissolved air flotation or chemical precipitation.
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 February 11, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 11, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2022.
- 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.