Sam's Club, the retail warehouse store chain, and its parent company Walmart filed a patent infringement action Tuesday in Florida Middle District Court against BJ's Wholesale Club Holdings Inc. The suit, brought by DLA Piper, asserts four patents related to mobile and virtual self-service checkout tools. Counsel have not yet appeared for the defendants. The case is 6:22-cv-00587, Sam's West Inc. et al v. BJ's Wholesale Club Holdings, Inc.