Granted Patent
Utility
US 4,290,126 · App. 06/093,100
Ultrasonic intrusion alarm system
Inventors:
Robert J. McFadyen, John F. Zeigler, III
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Nov 9, 1979
Inventors
Robert J. McFadyen
John F. Zeigler, III
Assignee (at issue)
General Electric 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.