Granted Patent
Utility
US 5,315,285 · App. 07/875,061
Alarm system for sensing and vocally warning a person approaching a protected object
Inventor:
Michael Nykerk
Patented Case
View Patent ↗
Granted: May 24, 1994
Filed: Apr 28, 1992
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.