Granted Patent
Utility
US 6,602,302 · App. 09/706,000
Substituted 1,4 diaminobenzene compounds and oxidation dye precursor compositions containing same
Inventors:
Laurent Chassot, Hans-Juergen Braun
Patented Case
View Patent ↗
Granted: Aug 5, 2003
Filed: Nov 3, 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.