Granted Patent
Utility
US 4,280,332 · App. 06/061,707
Defrost control monitoring fan motor temperature rise
Inventors:
Asadulla R. Khan, Otto H. Boning
Patented Case
View Patent ↗
Granted: Jul 28, 1981
Filed: Jul 30, 1979
Inventors
Asadulla R. Khan
Otto H. Boning
Assignee (at issue)
Intertherm 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.