In April 2019, Kaifi, LLC, a Texas plaintiff associated with Intellectual Discovery Co., Ltd., launched its Wi-Fi calling campaign with a single case accusing AT&T of infringing a patent generally directed to maintaining connectivity when a user moves from an inside to outside, with the same backend infrastructure managing the handoffs. That case ended in early August 2020 after District Judge Rodney Gilstrap handed down an April 2020 order construing multiple terms from the patent’s claims and while the court was in receipt of a large number of motions for summary judgment and to strike contentions and related expert opinions, as well as an earlier motion to dismiss for lack of standing—the related papers for nearly all of which were filed under seal. Kaifi has now reupped its campaign, accusing Deutsche Telekom (IBSV, Layer3 TV, MetroPCS, Theory Mobile, T-Mobile) (2:20-cv-00281) and Verizon (Cellco Partnership d/b/a Verizon Wireless) (2:20-cv-00280) of infringing the same patent in separate complaints, also filed in the Eastern District of Texas.
Another affiliate of Golden Wave Partners Co., Ltd. has kicked off a US litigation campaign. On April 26, Kaifi, LLC, a Texas entity formed in mid-March, accused AT&T (2:19-cv-00138) of infringing a single patent that the plaintiff contends is “directed to an Internet network connecting and roaming system and method”. The plaintiff identifies AT&T’s accused instrumentalities as “systems, networks, and components and services thereto for implementing seamless network transition, including offloading to a Wi-Fi network, such as their Wi-Fi Calling system and service”.