Benzoxazine dyes
CA 2011642 C · Owner: Clairol Incorporated · Inventors: Lim, Mu-Ill; Botta, Nancy A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel nitrobenzoxazine compounds are useful as dyes for coloring keratinaceous substrates such as human hair. Compounds of formula I, (see fig. I) wherein: X and Y are independently selected from the group consisting of: hydrogen, C1-6 alkyl, C1-6alkoxyalkyl C1-6, aminoalkyl, C1-6 hydroxyalkyl, and C1-6 hydroxyaminoalkyl.
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
- Filed March 7, 1990 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2012.
- 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.