Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Process for the preparation of N,N'-disubstituted 1,4-diaminoanthraquinones

Process for the preparation of N,N'-disubstituted 1,4-diaminoanthraquinones

US Patent 5639896 · Granted Jun 17, 1997

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Pigment preparations2024
Methine dyes2021
Methine dyes2020
Methine dyes2019
Methine dyes2019
Yellow methine dyes2019
Metal azo pigments2017
Metal azo pigments and pigment preparations produced therefrom2015
Fluorine-substituted perylenes for colour filters in LCDS2012
Preparation of styryl dyes2005
Crystal form of a perinone dye2005
Electrochromic device with a yellow filter2003