Granted Patent
Utility
US 4,583,021 · App. 06/485,780
Electron gun with improved cathode and shadow grid configuration
Inventors:
Ronald W. Herriott, Johann R. Hechtel
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Apr 18, 1983
Inventors
Ronald W. Herriott
Johann R. Hechtel
Assignee (at issue)
Litton Systems, Inc.
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.