Granted Patent
Utility
US 5,006,975 · App. 07/431,598
Power factor correction circuit
Inventor:
Herman Neufeld
Patented Case
View Patent ↗
Granted: Apr 9, 1991
Filed: Nov 3, 1989
Inventor
Herman Neufeld
Assignee (at issue)
Cherry Semiconductor 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.