Granted Patent
Utility
US 4,315,171 · App. 06/095,068
Step motors
Inventor:
Ernest Schaeffer
Patented Case
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Granted: Feb 9, 1982
Filed: Nov 16, 1979
Inventor
Ernest Schaeffer
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.