TMUS · News · 20260831N

Litigation and Legal Risk

T-Mobile US, Inc. · 2026-08-31 · Importance 34 · Surprise 42

The U.S. Court of Appeals for the Federal Circuit ruled that it lacked jurisdiction over T-Mobile US’s appeal involving a patent settlement agreement with KAIFI LLC. The case concerns T-Mobile’s alleged obligation to make a contingent payment after certain KAIFI patent claims survived an ex parte reexamination. The CAFC transferred the appeal to the U.S. Court of Appeals for the Fifth Circuit, finding that the contract-breach dispute could be resolved without a substantial patent-law question.

Key facts

• The dispute involves T-Mobile's obligation to make a contingent payment to KAIFI after certain patent claims "survived" an ex parte reexamination. source
• The U.S. Court of Appeals for the Federal Circuit (CAFC) ruled it lacks jurisdiction over an appeal concerning a patent settlement agreement between T-Mobile US, Inc. and KAIFI LLC and transferred the case to the Fifth Circuit. source
• The CAFC determined that resolving the breach of contract counterclaim did not necessarily raise a substantial question of patent law because the interpretation of the contract could be resolved without deep patent-law inquiries. source
• Connor Clark and Lunn Investment Management Ltd. purchased 6,526 shares of T-Mobile US, Inc. in the second quarter, valued at approximately $1,095,000. source