Method for improving uv radiation stability of photosensitive sunscreen filters
CA 2353718 A1 · Owner: L'Oreal · Inventors: Sanchez, Clement; Chodorowski, Sandrine; Quinn, Francis Xavier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for improving the UV radiation stability of a photosensitve sunscreen filter which consists in incorporating said filter in a substance produced by sol-gel process from at least a silicon alkoxide and at least a surfactant. The invention also concerns a photostable substance comprising in combination a sunscreen filter and a light stabilizing substance produced by sol-gel process containing at least a silicon alkoxide and at least a non-ionic surfactant and a cosmetic and/or dermatological composition comprising in a cosmetically and/or dermatologically acceptable support an efficient amount of a photostable substance. Said cosmetic and/or dermatological …
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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 September 28, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 28, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2022.
- 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.