Granted Patent
Utility
US 4,230,731 · App. 05/909,461
Microwave cooking method and control means
Inventor:
Hugh J. Tyler
Patented Case
View Patent ↗
Granted: Oct 28, 1980
Filed: May 25, 1978
Inventor
Hugh J. Tyler
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.