Ketone-based surfactant and method for treating industrial, commercial, and institutional waste-water
CA 2176276 C · Owner: Joseph, Albert Ferris · Inventors: Smith, Charles Arnold; Galante, Denise Christine; King, Stephen Wayne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
58-, A nonionic surfactant having cyclic 1,3-dioxane and/or 1,3dioxolane functionality which is irreversibly splittable by lowering the pH of its aqueous solution is useful in various processes requiring the removal of emulsified hydrophobic contaminants or other hydrophobic materials from an aqueous stream. After splitting of the surfactant into its component ketone and polyol, the hydrophobic components phase-separate and can be removed from the aqueous stream by routine means. The non-ionic surfactant is represented by the formulas: or, of which R and R' are the residue of an organic compound (substituted or unsubstituted) which does not contain a beta-alkoxy substituent or other …
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 10, 1996 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2018.
- 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.