Granted Patent
Utility
US 4,820,893 · App. 07/189,205
Two-celled expandable microwave cooking sling
Inventor:
Duane R. Mode
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: May 2, 1988
Inventor
Duane R. Mode
Assignee (at issue)
Waldorf Corporation
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.