Granted Patent
Utility
US 5,239,153 · App. 07/841,286
Differential thermal heating in microwave oven packages
Inventor:
Donald G. Beckett
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Feb 28, 1992
Inventor
Donald G. Beckett
Assignee (at issue)
Beckett Industries 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.