Granted Patent
Utility
US 5,118,984 · App. 07/666,002
Electron tube cathode
Inventors:
Masato Saito, Ryo Suzuki, Keiji Fukuyama, Takuya Ohira, Keiji Watanabe, Hisao Nakanishi, Kinjiro Sano, Toyokazu Kamata, Takashi SHINJOU
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Mar 7, 1991
Inventors
Masato Saito
Ryo Suzuki
Keiji Fukuyama
Takuya Ohira
Keiji Watanabe
Hisao Nakanishi
Kinjiro Sano
Toyokazu Kamata
Takashi SHINJOU
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.