Granted Patent
Utility
US 6,764,523 · App. 10/160,649
Two-part aqueous composition for oxidative coloration of hair
Inventors:
Stephen Casperson, Zubaida Khan, Kue-Yick Lee
Patented Case
View Patent ↗
Granted: Jul 20, 2004
Filed: Jun 3, 2002
Inventors
Stephen Casperson
Zubaida Khan
Kue-Yick Lee
Assignee (at issue)
The Procter & Gamble Company
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.