Granted Patent
Utility
US 6,345,938 · App. 09/508,723
Process for drilling at least two holes in a two-step cycle
Inventors:
Andrej Schleicher, Karl Brandt
Patented Case
View Patent ↗
Granted: Feb 12, 2002
Filed: May 18, 2000
Inventors
Andrej Schleicher
Karl Brandt
Assignee (at issue)
ZF Lemförder Metallwaren AG
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.