Hydroxyesters as coupling agents for surfactant formulations
CA 2203233 C · Owner: Keys, Robert O. · Inventors: Keys, Robert O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are stable monophasic liquid compositions comprising water, one or more cationic anionic, amphoteric and/or nonionic surfactants exhibiting partial solubility in water or in concentrated formulations, and one or more coupling agents of the formula (1), RA-C(O)O-RC-(OC(O)RE)0-1 (1) wherein RA is C1-C15 alkyl with 0-3 hydroxyl substituents, RC is C1-C10 alkyl with 0-3 hydroxyl substituents, and RE is C1-C15 alkyl with 0-1 hydroxyl substituents, wherein the compounds of formula (1) contain 7 to 16 carbon atoms and a total of 1-3 hydroxyl substituents.
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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 April 21, 1997 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 2019.
- 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.