Granted Patent
Utility
US 4,884,553 · App. 07/123,686
Device for heat-treating food items
Inventor:
Werner Schwarzbacker
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Nov 23, 1987
Inventor
Werner Schwarzbacker
Assignee (at issue)
CONVOTHERM-ELEKTROGERATE GMBH
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.