Expired Canadian patentCanada
Hair colorants
CA 2042487 C · Owner: Wis-Surel, Gabriella · Inventors: Wis-Surel, Gabriella; Murphy, Bryan P.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Certain dispersant free substituted diaminoanthaquinone colorants are useful in, hair dye compositions to more intensely color hair. Coloring kits mousses, gels, and aerosols may contain the compositions.
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 13, 1991 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 13, 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.
FiledMay 13, 1991
GrantedMay 1, 2001
Term endedMay 13, 2011
Patent numberCA 2042487 C
Classification (IPC)C09B1/28 +2 more
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.