Aqueous alkaline composition
CA 2135148 C · Owner: Lenoir, Pierre Marie · Inventors: Lenoir, Pierre Marie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The aqueous composition comprises a non-ionic surfactant and an alkali metal hydroxide. The non-ionic surfactant is a propylene oxideethylene oxide derivative of an alcohol of Formula I R-O-C2H3(CH3)Oa-C2H4Ob-H (I) and/or, a butylene oxide-ethylene oxide derivative of an alcohol (ROH), of Formula II, R-O-C2H3(C2H5)oc-(C2H4Ob-H (II) wherein R is a linear or branched-alkyl or alkenyl group containing from 4 to 11 carbon atoms, (a) (the average degree of propoxylation per mole) is from 2.5 to 7, (b) (the average degree of ethoxylation per mole) is from 1 to 10, and, (c) (the average degree of butoxylation per mole) is from 0.5 to 4. The content of the alkali metal hydroxide is at least 5 …
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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 November 4, 1994 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2016.
- 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.