Granted Patent
Utility
US 6,692,880 · App. 10/139,782
Electrophotographic toner with stable triboelectric properties
Inventors:
Robert D. Fields, Dinesh Tyagi, John C. Wilson, Peter S. Alexandrovich, Robert A. Guistina
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: May 6, 2002
Inventors
Robert D. Fields
Dinesh Tyagi
John C. Wilson
Peter S. Alexandrovich
Robert A. Guistina
Assignee (at issue)
Heidelberger Druckmaschinen AG
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.