Sulfur-containing nitroaminobenzene dyes, process and hair dye compositions
CA 1338689 C · Owner: Lim, Mu-Ill · Inventors: Lim, Mu-Ill; Anderson, James S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel sulfur containing nitroamino benzene dyes of formula: (I), and salts thereof wherein, (a) R1 and R2 are the same or different and are selected from the group consisting of alkyl, hydroxyalkyl polyhydroxyalky, aminoalkyl, monoalkylaminoalkyl and dialkylaminoalkyl wherein, (b) n is 0, 1 or 2, and wherein (c) the group occupies a position that is meta or para to the group - NHR1 ; a process for synthesizing these compounds; and their use as direct dyeing hair dyes are being disclosed.
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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 November 5, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 5, 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.
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.