Guanidine hydroxide composition for waving hair
CA 1106288 A · Owner: Carson Products Company · Inventors: De La Guardia, Mario J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compositions and methods for curling hair and for straightening hair are disclosed, wherein the compositions contain, as the principal active ingredient thereof, guanidine hydroxide. The guanidine hydroxide may be conveniently prepared by reacting calcium hydroxide and guanidine carbonate. Hair is curled by contacting the hair with the composition while the hair is on curlers or otherwise, maintained in a curled configuration. After the desired treatment time, the hair is rinsed and neutralized with, long lasting curls of the so-called "permanent wave" nature resulting. Hair may be straightened by contacting the hair with the composition and maintaining the hair in a generally straight …
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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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.