Expired Canadian patentCanada
Tinctorial composition for keratinic fibers containing at least one co-solubilized n-substituted 2-nitro-paraphenylenediamine; related keratinic fibers dyeing processes
CA 1251738 A · Owner: L'Oreal · Inventors: Rosenbaum, Georges; Cotteret, Jean; Grollier, Jean-Francois
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
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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
- Granted March 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 28, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 19, 1985
GrantedMarch 28, 1989
Term endedMarch 28, 2006
Patent numberCA 1251738 A
Classification (IPC)D06P3/30 +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.