Granted Patent
Utility
US 4,275,464 · App. 06/012,744
Universal self-diagnosing appliance control
Inventor:
David J. Schmidt
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Feb 16, 1979
Inventor
David J. Schmidt
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.