Granted Patent
Utility
US 6,436,152 · App. 09/692,971
Substituted 2-aminoalky-1,4-diaminobenzene compounds and oxidation dye precursor compositions containing same
Inventors:
Laurent Chassot, Hans-Juergen Braun
Patented Case
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Granted: Aug 20, 2002
Filed: Oct 20, 2000
Inventors
Laurent Chassot
Hans-Juergen Braun
Assignee (at issue)
Wella GmbH
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.