Granted Patent
Utility
US 4,639,817 · App. 06/610,539
Protective relay circuit for detecting arcing faults on low-voltage spot networks
Inventors:
John Hutton Cooper, William H. South
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: May 15, 1984
Inventors
John Hutton Cooper
William H. South
Assignee (at issue)
Westinghouse Electric 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.