Granted Patent
Utility
US 4,622,453 · App. 06/624,987
Electron beam gun mounting on a work chamber
Inventor:
Helmut Spruck
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Jun 27, 1984
Inventor
Helmut Spruck
Assignee (at issue)
Leybold-Heraeus 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.