Granted Patent
Utility
US 4,481,501 · App. 06/228,651
Transformer arrangement for coupling a communication signal to a three-phase power line
Inventor:
William C. Perkins
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Jan 26, 1981
Inventor
William C. Perkins
Assignee (at issue)
Rockwell International 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.