Granted Patent
Utility
US 4,495,068 · App. 06/089,143
Fluid filtering device
Inventor:
Nils O. Rosaen
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Oct 29, 1979
Inventor
Nils O. Rosaen
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.