Granted Patent
Utility
US 4,433,528 · App. 06/413,113
Metal detector apparatus
Inventor:
Carl E. Bohman
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Aug 30, 1982
Inventor
Carl E. Bohman
Assignee (at issue)
Sperry Corp.
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.