Granted Patent
Utility
US 6,567,530 · App. 09/197,472
Device and method for authenticating and certifying printed documents
Inventors:
Seppo Reino Keronen, Stamatios Demetriou
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Nov 23, 1998
Inventors
Seppo Reino Keronen
Stamatios Demetriou
Assignee (at issue)
CANON KABUSHIKI KAISHA
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.