Granted Patent
Utility
US 5,417,600 · App. 08/007,792
Method of manufacturing an impregnation type cathode
Inventors:
Takeyuki Maegawa, Yoshio Takada
Patented Case
View Patent ↗
Granted: May 23, 1995
Filed: Jan 22, 1993
Inventors
Takeyuki Maegawa
Yoshio Takada
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.