Granted Patent
Utility
US 6,683,510 · App. 10/172,164
Ultra-wideband planar coupled spiral balun
Inventor:
Jose G. Padilla
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Aug 8, 2002
Inventor
Jose G. Padilla
Assignee (at issue)
NORTHROP GRUMMAN 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.