Granted Patent
Utility
US 4,521,722 · App. 06/587,721
Appliance controller
Inventors:
Richard C. Barthel, Richard D. Roy
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Mar 8, 1984
Inventors
Richard C. Barthel
Richard D. Roy
Assignee (at issue)
The Singer Company 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.