Granted Patent
Utility
US 4,647,913 · App. 06/691,548
Self-diagnostic ultrasonic intrusion detection system
Inventor:
Math Pantus
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Jan 15, 1985
Inventor
Math Pantus
Assignee (at issue)
American District Telegraph Company
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.