.alpha.-hydroxy fatty acid derivatives and external compositions containing the same
CA 2333701 C · Owner: Yakumaru, Masafumi · Inventors: Nakatsugawa, Hiroko; Yakumaru, Masafumi; Iwamoto, Yoshiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel oily base, which has excellent stability and a low melting point, dose not irritate the skin and is superior feel in use. And an external composition contains the oily base. The present invention is directed to an alpha-hydroxy fatty acid derivatives represented by the general formula (1):, (see fig I) , wherein R1 represents a straight-chain or branched alkyl group having 10 to 24 carbon atoms, R2 represents a straight-chain or branched alkyl group having 1 to 31 carbon atoms and R1, represents a straight-chain or branched alkyl group having 11 to 31 carbon atoms, and an external composition contains at least one of the derivatives.
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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 27, 1999 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2021.
- 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.