Skin-whitening agent
CA 2025825 C · Owner: Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo · Inventors: Mishima, Yutaka; Kurimoto, Masashi; Mishima, Yutaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lactic acid and its derivatives such as D-lactic acid, L-lactic acid, DL-lactic acid, and their nonmetallic derivatives and lactates of alkali metal or alkaline earth metal exhibit a strong skin-whitening effect at a concentration of 5 w/w % or higher in pigment cell. The skin-whitening effect is augmented by unsaturated fatty acids having a carbon number of 12-22.
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 September 20, 1990 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 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.