Granted Patent
Utility
US 5,735,971 · App. 08/563,547
Method for the Pre-treatment of steel parts prior to salt bath nitriding
Inventors:
Georg Wahl, Rainer Willing-Lepenies
Patented Case
View Patent ↗
Granted: Apr 7, 1998
Filed: Nov 28, 1995
Inventors
Georg Wahl
Rainer Willing-Lepenies
Assignee (at issue)
Durferrit GmbH Thermotechnik
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.