Granted Patent
Utility
US 5,096,450 · App. 07/679,170
Method for fabricating an impregnated type cathode
Inventors:
Toshikazu Sugimura, Yoshio Takeshima, Hidefumi Yamamoto, Masaaki Yabuta, Masami Horiuchi
Patented Case
View Patent ↗
Granted: Mar 17, 1992
Filed: Mar 26, 1991
Inventors
Toshikazu Sugimura
Yoshio Takeshima
Hidefumi Yamamoto
Masaaki Yabuta
Masami Horiuchi
Assignee (at issue)
NEC KANSAI, 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.