Granted Patent
Utility
US 4,890,439 · App. 07/268,851
Flexible disposable material for forming a food container for microwave cooking
Inventor:
Allen A. Smart
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Nov 9, 1988
Inventor
Allen A. Smart
Assignee (at issue)
James River 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.