Granted Patent
Utility
US 5,851,237 · App. 08/892,339
Oxidative hair dye compositions and methods containing 1--(4-aminophenyl) pyrrolidines
Inventors:
James S. Anderson, Michael Wong
Patented Case
View Patent ↗
Granted: Dec 22, 1998
Filed: Jul 14, 1997
Inventors
James S. Anderson
Michael Wong
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.