Granted Patent
Utility
US 5,017,053 · App. 07/302,310
Aeration device for bulk material containers
Inventor:
David E. Sisk
Patented Case
View Patent ↗
Granted: May 21, 1991
Filed: Jan 25, 1989
Inventor
David E. Sisk
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.