Granted Patent
Utility
US 4,236,250 · App. 06/041,275
Multiline switch
Inventor:
Charles E. Huffman
Patented Case
View Patent ↗
Granted: Nov 25, 1980
Filed: May 21, 1979
Inventor
Charles E. Huffman
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.