Granted Patent
Utility
US 5,001,425 · App. 07/450,320
Ferromagnetic object detector with comparison of signal maximums from a pair of detection coils
Inventors:
Thomas E. Beling, Wayne M. Spani
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Dec 13, 1989
Inventors
Thomas E. Beling
Wayne M. Spani
Assignee (at issue)
Winfield Corporation
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.