Stabilized ascorbyl compositions
CA 2273327 C · Owner: Perricone, Nicholas V. · Inventors: Perricone, Nicholas V.; Potini, Chim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fatty acid esters of ascorbic acid, particularly saturated fatty acid esters such as ascorbyl palmitate, their salts ascorbic acid and its salts are , solubilized in large amounts e.g. up to about 25 % by weight, and stabilized using special solvent systems. Useful solvents include polyethylene glycol ethoxydiglycol, propylene glycol, butylene glycol propylene carbonate, glycerin, a capric glyceride a caprylic glyceride, an alkyl lactate an alkyl , adipate, an isosorbide, and mixtures thereof. Preferred dermatological compositions made using these solvents with ascorbic acid and/or at least one of its derivatives also include dimethylaminoethanol tyrosine, proline, cystine, a …
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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 17, 1997 and granted January 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2019.
- 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.