Granted Patent
Utility
US 4,242,756 · App. 06/041,276
Multiline switching protection apparatus
Inventors:
Charles E. Huffman, Robert J. McGuire, Herbert E. Welch
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: May 21, 1979
Inventors
Charles E. Huffman
Robert J. McGuire
Herbert E. Welch
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.