Granted Patent
Utility
US 4,906,818 · App. 07/206,493
Heater safety mechanism
Inventors:
Charles H. Lumpp, William W. Wolkoff
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Jun 14, 1988
Inventors
Charles H. Lumpp
William W. Wolkoff
Assignee (at issue)
Toastmaster, Inc.
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.