Granted Patent
Utility
US 4,467,258 · App. 06/451,695
Power factor correction for variable speed drive
Inventor:
John M. Leuthen
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Dec 20, 1982
Inventor
John M. Leuthen
Assignee (at issue)
Hughes Tool Company LLC
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.