Granted Patent
Utility
US 4,605,898 · App. 06/750,054
Pulse field metal detector with spaced, dual coil transmitter and receiver systems
Inventors:
Kari T. J. Aittoniemi, Erkki Sakari Kiuru, Aatu Veikko Kalevi Lappalainen, Kalevi Savolainen
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Jun 27, 1985
Inventors
Kari T. J. Aittoniemi
Erkki Sakari Kiuru
Aatu Veikko Kalevi Lappalainen
Kalevi Savolainen
Assignee (at issue)
Outokumpu Oyj
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.