Granted Patent
Utility
US 6,515,764 · App. 09/216,236
Method and apparatus for detecting photocopier tracking signatures
Inventors:
Keith T. Knox, Zhigang Fan, Erie J. Schneider
Patented Case
View Patent ↗
Granted: Feb 4, 2003
Filed: Dec 18, 1998
Inventors
Keith T. Knox
Zhigang Fan
Erie J. Schneider
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.