Granted Patent
Utility
US 4,218,410 · App. 05/902,475
Method for the production of high-purity metal powder by means of electron beam heating
Inventors:
Herbert Stephan, Hans Aichert, Joseph Heimerl
Patented Case
View Patent ↗
Granted: Aug 19, 1980
Filed: May 3, 1978
Inventors
Herbert Stephan
Hans Aichert
Joseph Heimerl
Assignee (at issue)
Leybold-Heraeus GmbH & Co. KG
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.