Granted Patent
Utility
US 4,935,861 · App. 07/366,098
Uninterrupted power supply having no low frequency power magnetics
Inventors:
Robert W. Johnson, William J. Raddi, George W. Oughton, Jr.
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Jun 13, 1989
Inventors
Robert W. Johnson
William J. Raddi
George W. Oughton, Jr.
Assignee (at issue)
Exide Electronics 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.