Granted Patent
Utility
US 5,846,409 · App. 08/010,272
Adjustable continuous filtration system for cooking fats and cooking oils
Inventor:
Ronald J. Zappe
Patented Case
View Patent ↗
Granted: Dec 8, 1998
Filed: Jan 21, 1998
Inventor
Ronald J. Zappe
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.