Granted Patent
Utility
US 4,952,939 · App. 07/311,271
Radar intrusion detection system
Inventor:
Willian R. Seed
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Feb 16, 1989
Inventor
Willian R. Seed
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.