Granted Patent
Utility
US 4,767,452 · App. 06/881,636
Process for separating metals by distillation and condensation
Inventor:
Otto W. Stenzel
Patented Case
View Patent ↗
Granted: Aug 30, 1988
Filed: Jul 3, 1986
Inventor
Otto W. Stenzel
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.