Granted Patent
Utility
US 4,219,859 · App. 06/002,532
Multiple range inverse time overcurrent relay
Inventor:
Michael Estes
Patented Case
View Patent ↗
Granted: Aug 26, 1980
Filed: Jan 11, 1979
Inventor
Michael Estes
Assignee (at issue)
RTE 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.