Granted Patent
Utility
US 5,840,174 · App. 08/705,627
Process for the purification of gases
Inventors:
Thomas Lehmann, Dieter Engel, Rainer Sanzenbacher
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Aug 30, 1996
Inventors
Thomas Lehmann
Dieter Engel
Rainer Sanzenbacher
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.