Granted Patent
Utility
US 6,409,773 · App. 09/736,913
Coupler for use in oxidative hair dyeing
Inventors:
Mu-Ill Lim, Yuh-Guo Pan, Margaret Popp
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Dec 14, 2000
Inventors
Mu-Ill Lim
Yuh-Guo Pan
Margaret Popp
Assignee (at issue)
Clairol Incorporated
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.