Granted Patent
Utility
US 4,936,992 · App. 07/319,236
Arrangement of rotating filters for improved filtrate discharge
Inventor:
Bjarne Nilsson
Patented Case
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Granted: Jun 26, 1990
Filed: Feb 24, 1989
Inventor
Bjarne Nilsson
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.