Granted Patent
Utility
US 6,723,391 · App. 09/827,462
Method for producing cutting tools
Inventors:
Volker Derflinger, Harald Zimmermann
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Apr 6, 2001
Inventors
Volker Derflinger
Harald Zimmermann
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.