Granted Patent
Utility
US 4,307,403 · App. 06/149,943
Aperture antenna having the improved cross-polarization performance
Inventors:
Yoshihide Yamada, Takashi Yamada, Tadashi Takano
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: May 15, 1980
Inventors
Yoshihide Yamada
Takashi Yamada
Tadashi Takano
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.