Granted Patent
Utility
US 6,797,012 · App. 10/171,543
Solid colorant for keratin fibers
Inventors:
Erik Schulze zur Wiesche, Detlef Hollenberg, Michael Dreja
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Jun 14, 2002
Inventors
Erik Schulze zur Wiesche
Detlef Hollenberg
Michael Dreja
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.