Photostable sunscreen composition comprising a dibenzoylmethane derivative and a polysaccharide alkylether and its uses
CA 2201959 C · Owner: Hansenne, Isabelle · Inventors: De Chabannes, Karine; Hansenne, Isabelle
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention consists of a new photostable cosmetic composition for protecting skin and/or hair against ultraviolet radiation. It comprises in a cosmetically acceptable matrix, at least one dibenzoylmethane derivative as an active UV-A screen and at least one polysaccharide alkylether formed of patterns of at least two different saccharide cycles each pattern having at least one hydroxyl group replaced by a saturated hydrocarbon alkyl chain as a stabilizing agent for the screen. It also includes the corresponding photostabilization process and the application of the composition to skin and hair to protect against the effects of ultraviolet radiation.
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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 April 4, 1997 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 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.