Granted Patent
Utility
US 5,393,389 · App. 08/170,422
Electrolytic process for obtaining high purity platinum from contaminated platinum
Inventors:
Sigrid Herrmann, Uwe Landau
Patented Case
View Patent ↗
Granted: Feb 28, 1995
Filed: Dec 20, 1993
Inventors
Sigrid Herrmann
Uwe Landau
Assignee (at issue)
Schott Glaswerke
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.