Granted Patent
Utility
US 4,686,413 · App. 06/942,955
Cathode for magnetron
Inventors:
Yoshihiko Sato, Nobuaki Yamamoto
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: Dec 17, 1986
Inventors
Yoshihiko Sato
Nobuaki Yamamoto
Assignee (at issue)
NEW JAPAN RADIO CO., LTD.
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.