US Patent 7435269 Bismuth dye system for human hair

Patent 7435269 was granted and assigned to Combe Incorporated on October, 2008 by the United States Patent and Trademark Office.

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Patent

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Current Assignee

Combe Incorporated

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7435269

Date of Patent

October 14, 2008

Patent Application Number

11266858

Date Filed

November 4, 2005

Patent Primary Examiner

‌

Eisa B Elhilo

Patent abstract

A progressive hair dyeing composition which comprises the following ingredients:(a) from 0.1 to 5 wt % of a bismuth salt;(b) from 0.1 to 5 wt % of a thiosulfate compound;(c) from 1 to 20 wt % of a delta-valerolactam;(d) from 0.25 to 2.5 wt % of an alkaline agent;(e) from 0 to 5 wt % of elemental sulfur; and(e) from 50 to 90 wt % of water.

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