Granted Patent
Utility
US 5,490,725 · App. 08/313,870
Melt-sealing device for extruders for the processing of thermoplastic polymers or rubber
Inventors:
Friedrich-Otto Behrens, Ulrich Proossler, Jurgen Voigt
Patented Case
View Patent ↗
Granted: Feb 13, 1996
Filed: Sep 28, 1994
Inventors
Friedrich-Otto Behrens
Ulrich Proossler
Jurgen Voigt
Assignee (at issue)
Hermann Berstorff Maschinenbau 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.