Cosmetic composition based on chitosan and ampholytic copolymers as wellas a chitosan/polyampholyte salt
CA 1294613 C · Owner: Wella Aktiengesellschaft · Inventors: Wendel, Harald; Lang, Gunther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a cosmetic compostion for the treatment of hair or skin, based on 0.05 to 10 wt.% of chitosan including 0.05 to 20 wt.% of an ampholytic copolymer of the formula (I), where m is from 0.1 to 0.9, and n is 0.5 to 0.9. The compositions yield clear, smooth films which do not become sticky in a humid environment nor brittle in a dry one. The invention also relates to a new chitosan/polyampholyte salts which can be obtained by reacting chitosan with an ampholytic copolymer of the formula (I).
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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
- Granted January 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
- 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.