Granted Patent
Utility
US 4,897,630 · App. 07/260,933
Programmable alarm system having proximity detection with vocal alarm and reporting features
Inventor:
Michael Nykerk
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Oct 21, 1988
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.