Granted Patent
Utility
US 4,680,439 · App. 06/869,214
Plastic microwave oven cavity
Inventor:
Ronald W. Millman
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: May 30, 1986
Inventor
Ronald W. Millman
Assignee (at issue)
Litton Systems, 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.