Skin whitening cosmetics
CA 2022654 C · Owner: Shimizu, Mitsuaki · Inventors: Ando, Hideya; Ozasa, Yoshitsugu; Kato, Hisatoyo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A skin whitening cosmetic is disclosed which comprises, (a) at least one compound selected from the group consisting of a free fatty acid having from 18 to 22 carbon atoms and containing at least two unsaturated bonds per molecule a salt, of the fatty acid, and an ester of the fatty acid with a monohydric or dihydric alcohol, and (b) at least one silicone oil selected from the group consisting of compounds represented by formulae (I), (II), and (III):, (see formula I) wherein n1 represents an integer of from 4 to 6 (see formula II), wherein n2 represents an integer of from 1 to 400 (see formula III), wherein n3 and n4 each represents an integer the sum of n3 and, n4 being from 1 to 400.
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 August 3, 1990 and granted September 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2012.
- 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.