Granted Patent
Utility
US 4,856,579 · App. 07/184,983
Hot and cold frostop for food and salad bar
Inventor:
John J. Wolfe
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Apr 22, 1988
Inventor
John J. Wolfe
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.