Granted Patent
Utility
US 5,922,194 · App. 08/981,075
Filter changing device for plastics processing plants
Inventors:
Theodor Bruckmann, Ralf Simon
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Nov 25, 1997
Inventors
Theodor Bruckmann
Ralf Simon
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.