Granted Patent
Utility
US 6,811,573 · App. 10/169,120
Dyes for keratin fibres containing 1,3-diamino-4-heteroarylbenzene derivatives and novel 1,3-diamino-4-heteroarylbenzene derivatives
Inventors:
Laurent Chassot, Hans-Juergen Braun
Patented Case
View Patent ↗
Granted: Nov 2, 2004
Filed: Jun 26, 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.