Granted Patent
Utility
US 4,889,456 · App. 07/300,275
Drilling tool for drilling in solid metal material, in particular for drilling in plate stacks
Inventor:
Bernd Killinger
Patented Case
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Granted: Dec 26, 1989
Filed: Jan 19, 1989
Inventor
Bernd Killinger
Assignee (at issue)
Komet Stahlhalter-und Werkzeugfabrik Robert Breuning GmbH
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.