Granted Patent
Utility
US 4,220,840 · App. 05/907,670
Pulsing probe for microwave oven
Inventor:
Charles E. Barker
Patented Case
View Patent ↗
Granted: Sep 2, 1980
Filed: May 19, 1978
Inventor
Charles E. Barker
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.