Caddo Systems, Inc., as owner of the asserted patents, and exclusive licensee 511 Technologies, Inc. have filed another round in a litigation campaign over a family of patents generally related to hierarchical menu navigation. The newest defendants are MediaTek (6:20-cv-00241), Microchip (6:20-cv-00245), NXP (6:20-cv-00244), and Siemens (4:20-cv-00255), each accused of infringement through the provision of nested menu systems for navigating product platforms and/or company websites. The plaintiffs began this campaign in 2016, with the last open cases closing in mid-2017.