Granted Patent
Utility
US 6,476,340 · App. 09/545,731
Electron beam gun with grounded shield to prevent arc-down and gas bleed to protect the filament
Inventor:
Russell J. Hill
Patented Case
View Patent ↗
Granted: Nov 5, 2002
Filed: Apr 10, 2000
Inventor
Russell J. Hill
Assignee (at issue)
The BOC Group Limited
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.