Granted Patent
Utility
US 5,097,791 · App. 07/636,222
Apparatus for invalidating security prints printed on print carriers
Inventors:
Claus D. Barrois, Philipp A. Dieterich
Patented Case
View Patent ↗
Granted: Mar 24, 1992
Filed: Dec 31, 1990
Inventors
Claus D. Barrois
Philipp A. Dieterich
Assignee (at issue)
De La Rue Giori S.A.
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.