Granted Patent
Utility
US 4,237,148 · App. 05/964,093
Method of vaporizing alloys of metals having different vapor pressures
Inventors:
Hans Aichert, Otto-Horst Hoffman, Herbert Stephan
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Nov 24, 1978
Inventors
Hans Aichert
Otto-Horst Hoffman
Herbert Stephan
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.