Granted Patent
Utility
US 4,994,183 · App. 07/319,235
Rotating filter with outer filtrate conduits
Inventor:
Bjarne Nilsson
Patented Case
View Patent ↗
Granted: Feb 19, 1991
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.