Granted Patent
Utility
US 4,841,405 · App. 06/709,235
Protective relaying apparatus for providing fault-resistance correction
Inventor:
Eric A. Udren
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Mar 6, 1985
Inventor
Eric A. Udren
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.