Granted Patent
Utility
US 5,849,042 · App. 08/972,978
Hair dye compositions containing 2,3 dialkyl-4-aminophenol and a 2-alkyl-1-naphthol
Inventors:
Mu-Ill Lim, Yuh-Guo Pan
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Nov 19, 1997
Inventors
Mu-Ill Lim
Yuh-Guo Pan
Assignee (at issue)
BRISTOL-MYERS SQUIBB 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.