Granted Patent
Utility
US 5,004,414 · App. 07/446,557
Apparatus for filtering plasticized materials in extruders and like machines
Inventors:
Rolf-Rudiger Stude, Ludger Wilken-Trenkamp
Patented Case
View Patent ↗
Granted: Apr 2, 1991
Filed: Dec 5, 1989
Inventors
Rolf-Rudiger Stude
Ludger Wilken-Trenkamp
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.