Granted Patent
Utility
US 5,491,375 · App. 08/246,710
Cathode, electron gun, and cathode-ray tube having a heating element for use during cold electron emisson
Inventor:
Yasuo Iwasaki
Patented Case
View Patent ↗
Granted: Feb 13, 1996
Filed: May 20, 1994
Inventor
Yasuo Iwasaki
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.