Last December, Cobblestone Wireless, LLC filed a trio of Eastern District of Texas complaints, one against each of AT&T (AT&T Mobility), Deutsche Telekom (T-Mobile), and Verizon (Verizon Wireless) over the alleged infringement of the same four former Empire Technology Development LLC patents. A June complaint against Samsung followed, with Cobblestone asserting those four patents as well as a fifth, the new patent acquired in the intervening months, and now the plaintiff has circled back to accuse the same three wireless carriers—AT&T (AT&T Mobility) (2:23-cv-00380), T-Mobile (2:23-cv-00381), and Verizon Wireless (2:23-cv-00382)—of infringing that fifth patent, in another set of Eastern District of Texas complaints.