Granted Patent
Utility
US 6,004,520 · App. 08/764,461
Method for operating a purification device, a purification device and use of the same
Inventors:
Martin Hartweg, Rolf-Dirc Roitzheim, Andrea Seibold, Leonhard Walz, Thomas Fetzer, Bernd Morsbach
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Dec 12, 1996
Inventors
Martin Hartweg
Rolf-Dirc Roitzheim
Andrea Seibold
Leonhard Walz
Thomas Fetzer
Bernd Morsbach
Assignee (at issue)
Daimler-Benz 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.