Granted Patent
Utility
US 6,669,739 · App. 10/019,421
Agent for coloring fibers and method for temporarily coloring fibers
Inventors:
Guido Sauter, Hans-Juergen Braun, Nadia Reichlin
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Dec 21, 2001
Inventors
Guido Sauter
Hans-Juergen Braun
Nadia Reichlin
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.