Granted Patent
Utility
US 4,767,975 · App. 06/894,500
Controller for induction motors
Inventor:
Peter Unsworth
Patented Case
View Patent ↗
Granted: Aug 30, 1988
Filed: Aug 4, 1986
Inventor
Peter Unsworth
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.