Granted Patent
Utility
US 5,631,114 · App. 08/576,234
Derivatives of diiminoquinones useful as electron transport agents in electrophotographic elements
Inventors:
Khe C. Nguyen, Sivapackia Ganapathiappan
Patented Case
View Patent ↗
Granted: May 20, 1997
Filed: Dec 21, 1995
Inventors
Khe C. Nguyen
Sivapackia Ganapathiappan
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.