Granted Patent
Utility
US 6,685,751 · App. 10/251,765
Substituted 1,4-diaminobenzene compounds and oxidation dye precursor compositions containing same
Inventors:
Laurent Chassot, Hans-Juergen Braun
Patented Case
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Granted: Feb 3, 2004
Filed: Sep 20, 2002
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.