Combined two-part reducing agent/humectant shaving system for improved shaving comfort
CA 2190959 C · Owner: Slife, Charles W. · Inventors: Stoner, Karla Leum; Slife, Charles W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of improving shaving comfort by softening the hair to be shaved so as to reduce the cutting force required to cut it. The novel method comprises carrying out the following sequential steps: (a) contacting an area of hair to be shaved with a reducing agent that breaks disulfide linkages in hair (b) contacting the area of hair treated in step (a) with a humectant and allowing it to dry or partially dry; (c) contacting the area treated in step (b) with water to hydrate the hair and (d) shaving the hydrated hair of step (c.
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 May 16, 1995 and granted July 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2017.
- 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.