Granted Patent
Utility
US 4,915,780 · App. 07/353,206
Process for making an element for microwave heating
Inventor:
Donald E. Beckett
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Apr 12, 1989
Inventor
Donald E. 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.