Catalyzed bismuth dye system for human hair
CA 1197466 A · Owner: Combe Incorporated · Inventors: Lapidus, Herbert; Shansky, Albert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dyeing system for human hair is provided comprising a bismuth salt, a sulfur source, such as elemental sulfur or thiosulfate, a complexing agent such as triethanolamine product, enhancers, and a catalyst which has a chemical structure having either an oxygen atom possessing a resonating double bond or an oxygen atom of an ether group attached to a carbon atom such, catalyst being characterized by a high degree of solubility in water and having a molecular weight of from about 50 to about 170. The ability of human hair to be effectively colored by a bismuth containing dyeing system involves a complex interaction of a number of components in the dyeing system and requires the presence of an …
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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 December 3, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 3, 2002.
- 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.