Granted Patent
Utility
US 4,905,011 · App. 07/081,962
Concentric ring antenna
Inventor:
Donald F. Shea
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Jul 20, 1987
Inventor
Donald F. Shea
Assignee (at issue)
E-Systems, 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.