Patent · US Expired

Triarylmethane dyes

US6846956B2 · kind B2 · utility

1Cited by

3References

27Claims

0Family size

Assignee

BASF SE

Inventors

Hellmut Kast
Thomas Gessner · Ypsilanti, US
Rainer Tresch · Frankenthal (Pfalz), DE

Key dates

Filing date	Aug 14, 2001
Grant date	Jan 25, 2005
Priority date	—
Expiry date	Nov 14, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S8/919
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Described is a triarylmethane dye of the formula I where R1 and R2 are independently methyl, ethyl or hydroxyethyl, Q is substituted or unsubstituited phenyl or naphthyl and A⊖ is the equivalent of an anion. It does not detach carcinogenic Michler's ketone.

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