Granted Patent
Utility
US 5,578,207 · App. 08/430,753
Filter device for extruders having a screen plunger with longitudinally arranged candle filters
Inventor:
Jan-Udo Kreyenborg
Patented Case
View Patent ↗
Granted: Nov 26, 1996
Filed: Apr 27, 1995
Inventor
Jan-Udo Kreyenborg
Assignee (at issue)
Firma Kreyenborg Verwaltungen und Beteilgungen 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.