Granted Patent
Utility
US 6,071,401 · App. 08/838,688
Electrolytic method for purifying gases
Inventors:
Dieter Engel, Thomas Lehmann, Harald Troll
Patented Case
View Patent ↗
Granted: Jun 6, 2000
Filed: Apr 9, 1997
Inventors
Dieter Engel
Thomas Lehmann
Harald Troll
Assignee (at issue)
Degussa AG
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.