WMS Gaming has filed a patent infringement lawsuit against Bally Gaming, a subsidiary of Bally Technologies.

The lawsuit, filed in the US District Court for the Northern District of Illinois, Eastern Division in Chicago, alleges that several of Bally’s products, including its Cash Spin product, infringe WMS patents covering WMS’ Transmissive Reels gaming concept and technology.

Specifically, the lawsuit relates to US patents 7,458,890, entitled Reel Spinning Slot Machine with Superimposed Video Image, and 7,585,220, entitled Gaming Machine with Superimposed Display Image.

WMS is seeking injunctive relief and unspecified damages.