Granted Patent
Utility
US 5,644,293 · App. 08/441,811
Ground fault detection with location identification
Inventors:
Robert W. Right, Jan A. Braam, John P. Hewlin, Rick Wolf
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: May 16, 1995
Inventors
Robert W. Right
Jan A. Braam
John P. Hewlin
Rick Wolf
Assignee (at issue)
Federal Signal 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.