Granted Patent
Utility
US 6,774,552 · App. 10/443,817
Electron gun
Inventor:
Akira Chiba
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: May 23, 2003
Inventor
Akira Chiba
Assignee (at issue)
NEC Microwave Tube, Ltd.
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.