A skin lightening composition containing an ascorbic acid compound
CA 2351077 A1 · Owner: Sumiyoshi, Toru · Inventors: Yamaguchi, Asako; Sumiyoshi, Toru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a composition comprising: (a) an ascorbic acid compound; (b) a charged, reflective particulate material a preferred embodiment of which is coated Titanium dioxide; (c) a structuring compound whose preferred embodiment is a combination of a surfactant and a fatty alcohol; and a cosmeticallyacceptable carrier. Preferred use of such composition is a skin whitening composition. Herein, ascorbic acid compound means ascorbic acid or derivatives thereof which have formula: (II) wherein R2 and R3 are independently selected from hydrogen and linear or branched alkyl of 1 to about 8 carbons; M1 is a metal; and x is an integer of from 1 to about 3. More preferably R2 and R3 , are …
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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 November 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2020.
- 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.