Granted Patent
Utility
US 4,432,369 · App. 06/299,628
Electromagnetic sensor having three electrodes for measuring signals indicative of a biologic condition
Inventor:
Kenneth Halvorsen
Patented Case
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Granted: Feb 21, 1984
Filed: Sep 4, 1981
Inventor
Kenneth Halvorsen
Assignee (at issue)
Medi-Tech Co., Ltd.
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.