Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Methine-azo compounds containing cyclic ammonium groups

Methine-azo compounds containing cyclic ammonium groups

US Patent 4754021 · Granted Jun 28, 1988

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Method of dyeing keratin-containing fibres2008
Method of dyeing keratin-containing fibres2007
Method of coloring hair using cationic dyes2006
Cationic azo dye compound2006
Method of coloring hair using cationic dyes2005
Cationic imidazole azo dyes2004
Processes for dyeing keratin-containing fibres with cationicazo dyes1999
Process for dyeing keratin-containing fibres with cationic dyes1998
Cationic imidazole azo dyes1998
Pressure-sensitive or heat-sensitive recording material1993
Methine-azo compounds containing cyclic cationic ammonium groups1989
Methine-azo compounds containing cyclic cationic ammonium groups and open-chain 1989