sentences:  However, Schulhof is also listed as co-inventor on another U.S. patent (6,549,942), and a fifth U.S. patent (5,914,941) references 5,557,541 and was assigned (as were the other four patents) to Audio Highway Media Corporation (a company co-founded and led by Schulhof when the patents were filed and/or issued).Audio Highway's Listen Up Player, the father of the MP3 player, won an Innovation Award from the Consumer Electronics Show in 1997 and a 1998 People's Choice Award at the 2nd annual Internet Showcase conference, held Jan. 30, 1998 and presented by Upside Media, Inc. and event host and co-founder, David Coursey.Because of his very early patents for a downloadable portable media player, Schulhof is often thought of as the father of the MP3 player.These patents, along with the remaining assets of audiohighway.com, were acquired in 2003 by Sony Corp.