Compositions for the treatment of pigmentation disorders and methods for their manufacture
CA 2450685 A1 · Owner: Taro Pharmaceuticals U.S.A. Inc. · Inventors: Patel, Bhiku G.; Wortzman, Mitchell S.; Gordon, Philip J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention addresses the problem of excessive discoloration in hydroquinone compositions of a neutral pH. Antioxidants in the hydroquinone phase and inorganic or amino acyl cationic salts of acidic ascorbyl esters preferably sodium metabisulfite and magnesium ascorbyl phosphate respectively are effective in stabilizing such hydroquinone compositions which are used in , treatment of pigmentation disorders. Protected retinoid may be added to these compositions for additional skin benefit effects.
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 May 16, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 16, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2024.
- 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.