Litigation summary

Litigation History of U.S. Patent 11,573,939

U.S. Patent No. 11,573,939, assigned to Kannuu Pty Ltd, has been the subject of litigation in U.S. federal courts and related proceedings before the Patent Trial and Appeal Board (PTAB).

District Court Litigation

• Plaintiff: Kannuu Pty Ltd.
• Defendants: Samsung Electronics Co., Ltd. and Samsung Electronics America, Inc.
• Jurisdiction: U.S. District Court for the Southern District of New York
• Case Number: 1:19-cv-04297 (ER)
• Filing Date: May 10, 2019.
• Status/Outcome:
  • Kannuu alleged that various Samsung Smart TVs and Blu-ray DVD players infringed on its patents, including the '393 patent.
  • In response to the lawsuit, Samsung filed petitions for inter partes review (IPR) at the PTAB, challenging the validity of the asserted patents.
  • The district court case was stayed on January 19, 2021, pending the resolution of the IPR proceedings for the '393 patent and another patent.
  • The PTAB issued a final written decision on September 21, 2021, finding the asserted claims of the '393 patent to be invalid. This decision was subsequently affirmed by the U.S. Court of Appeals for the Federal Circuit on October 11, 2023.
  • As of a court opinion dated July 29, 2025, the case was active, with the court granting a motion by Kannuu for leave to file a second amended complaint to add two new patents and denying Samsung's cross-motion to dismiss.

Appellate Litigation

• Appellant: Kannuu Pty Ltd.
• Appellees: Samsung Electronics Co., Ltd., Samsung Electronics America, Inc.
• Jurisdiction: U.S. Court of Appeals for the Federal Circuit
• Case Number: 21-1638
• Filing Date: Kannuu's appeal was decided on October 7, 2021.
• Status/Outcome:
  • This appeal arose from the district court's denial of Kannuu's motion for a preliminary injunction. Kannuu had sought to compel Samsung to withdraw its IPR petitions, arguing they violated a forum selection clause in a non-disclosure agreement (NDA) between the parties.
  • The Federal Circuit affirmed the district court's decision, holding that the IPR proceedings did not arise out of or relate to the NDA.

Patent Trial and Appeal Board (PTAB) Proceedings

Based on the information in the provided search results, there has not been an Inter Partes Review (IPR) proceeding specifically identified as "IPR2026-00071" involving US patent 11,573,939. However, the litigation records confirm that Samsung did file IPR petitions against the '393 patent.

• Petitioner: Samsung Electronics Co., Ltd. and Samsung Electronics America, Inc.
• Patent Owner: Kannuu Pty Ltd.
• Status/Outcome:
  • Samsung filed IPR petitions on March 27, 2020.
  • The PTAB instituted review of the '393 patent.
  • In a final written decision on September 21, 2021, the PTAB found the asserted claims of the '393 patent to be invalid. This decision was affirmed by the Federal Circuit.