Granted Patent
Utility
US 4,918,458 · App. 06/153,922
Secondary radar transponder
Inventors:
Anton Brunner, Karl-Heinz Kristkoiz
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: May 14, 1980
Inventors
Anton Brunner
Karl-Heinz Kristkoiz
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.