Granted Patent
Utility
US 4,520,302 · App. 06/588,225
Stepping motors and drive circuits therefor
Inventors:
Roland John Hill, Paul Philip Acarnley
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Mar 12, 1984
Inventors
Roland John Hill
Paul Philip Acarnley
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.