Process for in-situ surfactant washing of contaminated soil
CA 2030382 C · Owner: Ang, Carolina C. · Inventors: Fincham, Alva E.; Ang, Carolina C.; Abdul, Abdul S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A method is disclosed for the use of an aqueous surfactant solution to remove water-insoluble organic contaminant from subsurface soil layers. The process is carried out continuously with the application of the surfactant solution and the removal of the leachate from a recovery well within the treatment area. It is contemplated that the leachate will be treated above ground to remove the dispersed contaminant.
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 20, 1990 and granted June 14, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 2012.
- 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.