Defendant
2 cases as defendant.
Zentian Ltd. is a United Kingdom-based intellectual property (IP) licensing company, operating primarily as a non-practicing entity (NPE) or patent assertion entity (PAE). It is registered as ZENTIAN LIMITED (Company number 04054586) in the UK. Details regarding its founding year, employee count, or revenue are not publicly available, which is common for such entities.
The company's intellectual property portfolio is focused on speech and voice recognition technologies. Zentian Ltd. asserts patents related to foundational speech recognition circuits and methods, including U.S. Patent No. 7,979,277 B2 and U.S. Patent No. 10,839,789. These patents cover technologies embedded in consumer devices, cloud infrastructure, and voice-enabled platforms.
Zentian Ltd. exhibits the litigation posture of a patent assertion entity, evidenced by its record of three cases as a plaintiff and two as a defendant. The plaintiff-side cases include patent infringement suits against major technology companies such as Zentian Ltd. v. Amazon.com, Inc. et al. in the U.S. District Court for the Western District of Texas, a venue known for patent litigation. Its defendant cases, such as Apple Inc. v. Zentian Ltd. at the U.S. Court of Appeals for the Federal Circuit and Unified Patents v. Zentian Ltd. before the Patent Trial and Appeal Board, indicate that its asserted patents have faced validity challenges from accused infringers and patent defense organizations.
Notable cases include Zentian Ltd. v. Amazon.com, Inc. et al., filed in February 2022, concerning speech recognition technology. Additionally, Zentian Ltd. was involved in a significant patentability dispute with Apple Inc. over its '789 patent, which was ultimately vacated and remanded by the U.S. Court of Appeals for the Federal Circuit in July 2026, challenging the Patent Trial and Appeal Board's earlier findings. Unified Patents, an organization focused on deterring frivolous patent litigation, explicitly identified Zentian Ltd. as an NPE and offered a reward for prior art against one of its asserted patents.
Apple Inc. challenged the validity of Zentian Ltd.'s US Patent 10839789 before the CAFC, arguing its claims were obvious over US Patent 5819222 and US Patent 6832194. The CAFC vacated and remanded a PTAB decision that had previously favored Zentian Ltd., indicating errors in the PTAB's claim interpretation in light of prior art.
This is a Patent Trial and Appeal Board (PTAB) case initiated by Unified Patents against Zentian Ltd. concerning US Patent 10839789, which resulted in a Final Written Decision.