Granted Patent
Utility
US 6,800,097 · App. 10/146,264
Substituted 2-aminoalkyl-1,4-Diaminobenzene compounds and oxidation dye precursor compositions containing same
Inventors:
Laurent Chassot, Hans-Juergen Braun
Patented Case
View Patent ↗
Granted: Oct 5, 2004
Filed: May 15, 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.