Social Positioning Input Systems, LLC (SPIS), one of many NPEs controlled by prolific inventor Leigh M. Rothschild, has sued ClearPathGPS (2:21-cv-00519) in the Central District of California, Lytx (3:21-cv-00104) in the Southern District of California, and Particle Industries (3:21-cv-00464) in the Northern District of California. The sole patent-in-suit generally relates to transmitting the location information of a positional device, with the defendants accused of infringement through the provision of vehicle fleet tracking systems. Rothschild ended last year near the top of the list of frequent NPE plaintiffs, second only to Texas monetization firm IP Edge LLC.

The number of infringement suits filed by NPEs controlled by inventor Leigh M. Rothschild sharply increased last year, with over 140 patent cases filed in 2015 compared to just 35 in 2014. In fact, according to RPX’s 2015 NPE Activity: Highlights report published on January 4, 2016, Rothschild ranked first among the top ten NPEs by campaign defendants added in 2015.