Granted Patent
Utility
US 6,211,751 · App. 09/356,325
Microstrip broadband balun with four ground plates
Inventor:
Katsuhiko Aoki
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Jul 16, 1999
Inventor
Katsuhiko Aoki
Assignee (at issue)
MITSUBISHI ELECTRIC 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.