Granted Patent
Utility
US 6,447,591 · App. 09/512,896
Anthraquinone colorants for inks
Inventors:
Donald R. Titterington, Jeffery H. Banning
Patented Case
View Patent ↗
Granted: Sep 10, 2002
Filed: Feb 25, 2000
Inventors
Donald R. Titterington
Jeffery H. Banning
Assignee (at issue)
Xerox Corporation
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.