Granted Patent
Utility
US 4,608,513 · App. 06/650,014
Dual filament ion source with improved beam characteristics
Inventor:
William B. Thompson
Patented Case
View Patent ↗
Granted: Aug 26, 1986
Filed: Sep 13, 1984
Inventor
William B. Thompson
Assignee (at issue)
Varian, 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.