Granted Patent
Utility
US 5,117,217 · App. 07/610,402
Alarm system for sensing and vocally warning a person to step back from a protected object
Inventor:
Michael Nykerk
Patented Case
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Granted: May 26, 1992
Filed: Nov 7, 1990
Inventor
Michael Nykerk
Assignee (at issue)
Electronic Security Products of California, 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.