Aldehyde-based surfactant and method for treating industrial, commercial, and institutional waste-water
CA 2176277 C · Owner: Wizda, Cheryl Marie · Inventors: Joseph, Albert Ferris; Smith, Charles Arnold; Wizda, Cheryl Marie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A nonionic surfactant having cyclic 1,3-dioxane and/or 1,3-dioxolane functionality is irreversibly splittable by lowering the pH of its aqueous solution. The, cyclic 1,3-dioxolane has the formula: (see figure I), The 1,3-dioxolane has the formula: (see figure II), of which R is hydrogen and R' has no alkoxy linkage and is the residue of an organic, compound (substituted or unsubstituted) derived from an aldehyde of the formula, (see figure III), wherein R is hydrogen and R' is the residue of an organic compound (substituted or, unsubstituted) which contains a total of 8 to 20 carbon atoms and which contains no, moieties or linkages which significantly interfere with the performance of …
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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.