The suit alleges that several of Bally's products, including its Cash Spin product, infringe WMS patents covering WMS' Transmissive Reels gaming concept and technology (U.S. patent number 7,458,890 entitled "Reel Spinning Slot Machine with Superimposed Video Image" and U.S. patent number 7,585,220 entitled "Gaming Machine with Superimposed Display Image").
WMS is seeking injunctive relief and unspecified damages.