Granted Patent
Utility
US 4,675,774 · App. 06/808,768
Direct transfer trip apparatus for use with an active pilot wire communications channel
Inventors:
Russell W. Gonnam, Shan C. Sun
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Dec 13, 1985
Inventors
Russell W. Gonnam
Shan C. Sun
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.