Granted Patent
Utility
US 4,701,118 · App. 06/864,081
Apparatus for filtering plasticized materials in extruders
Inventors:
Horst Koching, Rolf-Rudiger Stude
Patented Case
View Patent ↗
Granted: Oct 20, 1987
Filed: May 16, 1986
Inventors
Horst Koching
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.