Process for the preparation of hydroxypropylated quaternary ammonium derivatives having a fatty ester acid function
CA 2222360 C · Owner: L'Oreal · Inventors: Campos, Alain; Philippe, Michel
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 novel one-step process for obtaining hydroxypropylated quaternary ammonium compounds having a fatty acid ester function that is simpler quicker and safer and does not use epihalohydrins alkylating agents or highly toxic solvents. The hydroxypropylated quaternary ammonium compounds having a fatty acid ester function of the present invention have the following general formula(I): (see Fig. I).
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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 December 10, 1997 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.