Granted Patent
Utility
US 6,422,852 · App. 09/673,058
Filter device for extruders and injection moulding machines
Inventors:
Jan-Udo Kreyenborg, Rolf-Rudiger Stude
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Oct 10, 2000
Inventors
Jan-Udo Kreyenborg
Rolf-Rudiger Stude
Assignee (at issue)
KREYENBORG VERWALTUNGEN UND BETEILIGUNGEN GMBH & CO. KG
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.