Cationic polymeric dyes
CA 1096310 A · Owner: The Gillette Company · Inventors: Tsai, Hu-Chu; Sokol, Phillip E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new class of water soluble cationic dyes especially useful in the rapid dyeing of hair prepared by the covalent reaction of visibly colored optical chromophores with selected polymeric backbones containing at least one primary secondary, or tertiary amino group per repeating unit.
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 February 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 24, 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.