Granted Patent
Utility
US 5,876,464 · App. 08/024,770
Hair dyeing with N-(4-aminophenyl) prolineamide, couplers, and oxidizing agents
Inventors:
Mu-Ill Lim, Margaret Popp, Yuh-Guo Pan
Patented Case
View Patent ↗
Granted: Mar 2, 1999
Filed: Feb 17, 1998
Inventors
Mu-Ill Lim
Margaret Popp
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.