Expired Canadian patentCanada
Hydroxynaphtoquinones for dyeing human keratinic fibres, process for dyeing and tinctorial composition so applied
CA 1186231 A · Owner: L'Oreal · Inventors: Forestier, Serge; Lang, Gerard; Rosenbaum, Georges
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 April 30, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 30, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 2, 1982
GrantedApril 30, 1985
Term endedApril 30, 2002
Patent numberCA 1186231 A
Classification (IPC)C07C50/12
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.