Granted Patent
Utility
US 5,896,280 · App. 08/988,335
Frequency converter and improved UPS employing the same
Inventors:
Jeff Gucyski, Robert W. Johnson, Rune Lennart Jonsson
Patented Case
View Patent ↗
Granted: Apr 20, 1999
Filed: Nov 25, 1997
Inventors
Jeff Gucyski
Robert W. Johnson
Rune Lennart Jonsson
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.