Granted Patent
Utility
US 5,196,707 · App. 07/671,425
Low Aberration field emission electron gun
Inventor:
Mark Gesley
Patented Case
View Patent ↗
Granted: Mar 23, 1993
Filed: Mar 4, 1991
Inventor
Mark Gesley
Assignee (at issue)
ETEC 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.