Granted Patent
Utility
US 4,253,166 · App. 06/029,521
Target location systems
Inventor:
Phillip Johnson
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Apr 12, 1979
Inventor
Phillip Johnson
Assignee (at issue)
Plessey Handel Und Investments AG
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.