Granted Patent
Utility
US 5,907,982 · App. 08/941,909
Drive for a double screw extruder
Inventor:
Ludger Urban
Patented Case
View Patent ↗
Granted: Jun 1, 1999
Filed: Oct 1, 1997
Inventor
Ludger Urban
Assignee (at issue)
A. Friedr. Flender Aktiengessellschaft
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.