Granted Patent
Utility
US 5,405,421 · App. 08/124,896
Gas stream filtering system using filtered gas for reverse flow cleaning
Inventor:
George W. Swisher, Jr.
Patented Case
View Patent ↗
Granted: Apr 11, 1995
Filed: Sep 22, 1993
Inventor
George W. Swisher, Jr.
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.