Granted Patent
Utility
US 4,737,700 · App. 06/939,179
Method and circuit for driving a stepping motor
Inventor:
Juergen Doelves
Patented Case
View Patent ↗
Granted: Apr 12, 1988
Filed: Dec 8, 1986
Inventor
Juergen Doelves
Assignee (at issue)
Dr. Ing. Rudolf Hell GmbH
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.