Granted Patent
Utility
US 6,328,819 · App. 09/562,695
Method and use of an apparatus for the thermal treatment, in particular nitriding treatment, of metal workpieces
Inventors:
Wolfgang Lerche, Bernd Edenhofer, Michael Lohrmann
Patented Case
View Patent ↗
Granted: Dec 11, 2001
Filed: Apr 28, 2000
Inventors
Wolfgang Lerche
Bernd Edenhofer
Michael Lohrmann
Assignee (at issue)
Ipsen International, 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.