Oxidative hair dye precursor compositions containing 4-5-diaminopyrazole, 5-amino-2-methylphenol and m-phenylenediamine compounds and method of dyeing hair

Granted: Apr 29, 2003 Filed: Feb 20, 2001

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.