Granted Patent
Utility
US 6,241,431 · App. 09/253,212
Process for the protective coating of machining tools and tool sets
Inventors:
Volker Derflinger, Harald Zimmermann, Christian Wohlrab
Patented Case
View Patent ↗
Granted: Jun 5, 2001
Filed: Feb 19, 1999
Inventors
Volker Derflinger
Harald Zimmermann
Christian Wohlrab
Assignee (at issue)
Unaxis Balzers Aktiengesellschaft
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.