Granted Patent
Utility
US 6,137,448 · App. 09/197,042
Center FED traveling wave antenna capable of high beam tilt and null free stable elevation pattern
Inventor:
John L. Schadler
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Nov 20, 1998
Inventor
John L. Schadler
Assignee (at issue)
Federal Signal Corporation
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.