Granted Patent
Utility
US 6,621,458 · App. 10/114,360
Combination linearly polarized and quadrifilar antenna sharing a common ground plane
Inventors:
Argy Petros, Terry C. Helstrom
Patented Case
View Patent ↗
Granted: Sep 16, 2003
Filed: Apr 2, 2002
Inventors
Argy Petros
Terry C. Helstrom
Assignee (at issue)
XM Satellite Radio Inc.
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.