Permanent wave solution
CA 1338799 C · Owner: Redken Laboratories, Inc. · Inventors: Mathews, Roger A.; Moore, Edward R.; Cannell, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous permanent wave solution employing one or more compounds for cleaving keratin interprotein disulfide bonds is enhanced by including a biocompatible 1,3-alkyldiol. Preferably from two to seven percent by weight of 2-ethyl-1,3-hexanediol or 1,3-butanediol is employed. Such compositions provide a useful neutral permanent wave solution employing ammonium thioglycolate, the first permanent wave solution with a pH in the same acidic range as the isolectric point of hair, or a five minute permanent wave with either an acid or alkaline solution.
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
- Granted December 17, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 17, 2013.
- 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.