Granted Patent
Utility
US 4,422,113 · App. 06/263,039
Stepping motor drive system
Inventor:
Stuart P. Mabon
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: May 12, 1981
Inventor
Stuart P. Mabon
Assignee (at issue)
Micropolis Corporation
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.