Granted Patent
Utility
US 5,769,906 · App. 08/721,658
Process for recovering the salt constituents from hardening-shop salt baths
Inventors:
Mattias Kremer, Georg Wahl, Eberhard Gock, Stefan Wigger, Jorg Kahler
Patented Case
View Patent ↗
Granted: Jun 23, 1998
Filed: Sep 27, 1996
Inventors
Mattias Kremer
Georg Wahl
Eberhard Gock
Stefan Wigger
Jorg Kahler
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.