Granted Patent
Utility
US 6,699,296 · App. 10/019,861
P-diaminobenzene derivatives and dyes containing said compounds
Inventor:
Laurent Chassot
Patented Case
View Patent ↗
Granted: Mar 2, 2004
Filed: Nov 9, 2001
Inventor
Laurent Chassot
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.