Granted Patent
Utility
US 5,450,189 · App. 08/196,937
Electrophotographic imaging with toners of opposite sign electrical charge
Inventors:
Dale D. Russell, James G. Bearss
Patented Case
View Patent ↗
Granted: Sep 12, 1995
Filed: Feb 15, 1994
Inventors
Dale D. Russell
James G. Bearss
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.