Multiplexor for interfacing scanner and printer with a function select circuit including three multiplex, tri-state buffers, and buffer circuits and display device for status indication

Granted: Feb 10, 1998 Filed: Jul 10, 1995

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.