Patent · US Expired

Direct dyes having a quaternary center with a long aliphatic chain

US5169403A · kind A · utility

11Cited by

1References

20Claims

0Family size

Assignee

Clairol Incorporated · US

Inventors

Alexander Chan · Buffalo Grove, US
Yuh-Guo Pan · Stamford, US

Key dates

Filing date	Nov 1, 1991
Grant date	Dec 8, 1992
Priority date	—
Expiry date	Nov 1, 2011

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61Q5/10
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

Direct dyes having a quaternary center with a long aliphatic chain, compositions containing those dyes, and the process of using them to dye hair are disclosed. These dyes have a higher affinity for hair and are more shampoo stable than conventional direct dyes, and produce pleasing uniform dyeing.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.