Betaine ester compounds of active alcohols
CA 2250837 C · Owner: Demeyere, Hugo Jean-Marie · Inventors: Declercq, Marc Johan; Struillou, Arnaud Pierre; Demeyere, Hugo Jean-Marie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a composition and process for preparing such a composition which provides stabilised betaine ester compounds of active alcohols in an acidic environment. In particular it relates to an aqueous , acidic composition comprising: a) a betaine ester of an active alcohol which at a concentration of from 0.01 % to 10 % by weight in said composition is , predominantly in the form of micelles and/or is capable of being incorporated into micelles, b) a surfactant, said composition comprising an acidic material in sufficient amount to render the pH of the composition of less than 7.
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 March 27, 1997 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 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.