Granted Patent
Utility
US 4,054,810 · App. 05/702,766
Field emission ion source having heated anode
Inventor:
Hans-Dieter Beckey
Patented Case
View Patent ↗
Granted: Oct 18, 1977
Filed: Jul 6, 1976
Inventor
Hans-Dieter Beckey
Assignee (at issue)
Varian Mat GmbH
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.