Granted Patent
Utility
US 4,805,385 · App. 07/138,990
Variable sensitivity metal detection system
Inventors:
Carl E. Bohman, Mark K. Chow
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Dec 29, 1987
Inventors
Carl E. Bohman
Mark K. Chow
Assignee (at issue)
Ford New Holland, Inc.
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.