Granted Patent
Utility
US 6,463,643 · App. 09/664,255
Apparatus for withdrawing a screw from the barrel of a screw extruder
Inventor:
Michael Behling
Patented Case
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Granted: Oct 15, 2002
Filed: Sep 18, 2000
Inventor
Michael Behling
Assignee (at issue)
Berstorff 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.