Method of reducing malodors in permanent waving
CA 2114748 C · Owner: Nandagiri, Arun · Inventors: Solka, Bruce H.; Kocis, John A.; Nandagiri, Arun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of treating hair to reduce post-perm odor by (1) reducing the degree of reaction between a permanent wave reducing agent and a natural compound contained in hair e.g. hair aldehydes; and/or (2) altering the malodor of products formed by the reaction of hair and a permanent wave reducing agent during the oxidation step; and/or (3) binding a fragrance to the hair to mask any odoriferous compounds that result from reaction of a reducing agent with the hair or from the reaction of reduced hair with an oxidizing agent; and/or (4) change the naturally occurring post-perm odor by adding a reducing agent reactant during the permanent waving process resulting in more pleasant smelling …
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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 February 2, 1994 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2016.
- 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.