Granted Patent
Utility
US 4,481,454 · App. 06/500,230
Method of driving a stepping motor
Inventor:
Yoshio Otani
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Jun 1, 1983
Inventor
Yoshio Otani
Assignee (at issue)
Diesel Kiki Co., Ltd.
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.