Granted Patent
Utility
US 4,304,979 · App. 05/954,140
Method and apparatus for electron beam welding at elevated pressures
Inventors:
Walter Dietrich, Fred H. Samuelson
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Oct 24, 1978
Inventors
Walter Dietrich
Fred H. Samuelson
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.