Oxidative hair dye compositions
CA 1103586 B · Owner: Bristol-Myers Canada Limited · Inventors: Brody, Frederick; Pohl, Stanley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oxidative hair dye composition containing as "para component", compounds of the formula: or their acid addition salts, in which: R1 is hydroxyalkyl;, R2 is hydrogen, alkyl or hydroxyalkyl; and, R3 is hydrogen, alkyl alkoxy or halogen;, provided that when R2 is hydrogen R3 is other than hydrogen.
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 November 9, 1976. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 9, 1993.
- 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.