Granted Patent
Utility
US 4,617,458 · App. 06/700,048
Counterfeit detection circuit
Inventor:
David R. Bryce
Patented Case
View Patent ↗
Granted: Oct 14, 1986
Filed: Feb 11, 1985
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.