Granted Patent
Utility
US 4,764,725 · App. 06/906,397
Apparatus for detecting counterfeit currency using two coils to produce a saturating magnetic field
Inventor:
David R. Bryce
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Sep 12, 1986
Inventor
David R. Bryce
Assignee (at issue)
THE BRANDT COMPANIES, LLC
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.