Expired Canadian patentCanada
Benzene-1,3-diamines; process for preparing them; intermediates and use of these benzene-1,3-diamines as coupling agents for the oxidation dyeing of keratinic fibers, especially human hair
CA 1315297 C · Owner: Lang, Gerard · Inventors: Lang, Gerard; Borowiak, Herve; Vandenbossche, Jean-Jacques
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 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 30, 2010.
- 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 30, 1988
GrantedMarch 30, 1993
Term endedMarch 30, 2010
Patent numberCA 1315297 C
Classification (IPC)C07C217/84 +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.