Granted Patent
Utility
US 6,500,213 · App. 09/446,726
Oxidizing hair coloring agents containing 2,5-diamino-1-phenylbenzene derivatives and novel 2,5-diamino-1-phenylbenzene derivatives
Inventors:
Hans-Juergen Braun, Laurent Chassot
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Mar 14, 2000
Inventors
Hans-Juergen Braun
Laurent Chassot
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.