Permanent hair waving kit and process
CA 2036615 A1 · Owner: Revlon, Inc. · Inventors: Cot, Jaime V.; Klein, Gustave J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1140-1, Abstract of the Disclosure, A method for providing permanent waves to a users hair is described in which a specific permanent wave formula is mixed at the point of use from a plurality of stock mixtures the amount of each, stock mixture incorporated in the formula being chosen in accordance with an evaluation of the hair to be waved. Thus the concentration, pH, and activity rate of the reducing agent can all be chosen so that the time and the temperature used for all permanent wave formulae are substantially constant for differing types of hair.
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
- Filed February 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 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.