Granted Patent
Utility
US 6,545,397 · App. 09/755,121
Cathode for electron tube
Inventors:
Takuya Ohira, Hiroyuki Teramoto, Keiji Fukuyama, Kiyoshi Saitou
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Jan 8, 2001
Inventors
Takuya Ohira
Hiroyuki Teramoto
Keiji Fukuyama
Kiyoshi Saitou
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.