Granted Patent
Utility
US 6,229,306 · App. 09/011,747
Method and apparatus for measuring magnetic properties of sheet material with both low and high magnetic particle density
Inventors:
Dieter Stein, Lothar Schütt
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Jun 18, 1998
Inventors
Dieter Stein
Lothar Schütt
Assignee (at issue)
GIESECKE & DEVRIENT GMBH
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.