Granted Patent
Utility
US 4,897,574 · App. 07/105,668
Hot cathode in wire form
Inventors:
Masato Saito, Keiji Fukuyama, Masako Ishida, Keiji Watanabe, Toyokazu Kamata, Kinjiro Sano, Hisao Nakanishi
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Oct 5, 1987
Inventors
Masato Saito
Keiji Fukuyama
Masako Ishida
Keiji Watanabe
Toyokazu Kamata
Kinjiro Sano
Hisao Nakanishi
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.