Surfactant selection method for the extraction of chemical pollutants from soils
CA 2089639 A1 · Owner: Purcell, Lauren M. · Inventors: Purcell, Lauren M.; Lawrence, Albert F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The physics of adhesion are applied to choosing surfactants that have Lewis acid-base and dispersion force interaction values which are required to optimally extract pollutants (10) from soils (12). This application is novel in predicting a surfactant's effectiveness in the removal of toxic contaminants. Additionally, Lewis acid-base and dispersion forces are applied to the selection of a co-surfactant to improve the adhesion between a surfactant and a pollutant.
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 June 22, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 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.