Patent 8355484

Litigation summary

Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.

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No PTAB proceedings on file. This patent has not been challenged through Inter Partes Review, Post-Grant Review, or Covered Business Method review at the USPTO. The absence is itself a signal — well-asserted patents eventually attract IPRs.

Cases on file (1)

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Specific litigation cases in our database that name US patent 8355484. The free-form analysis below may also discuss cases beyond this list.

Litigation summary

Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.

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Litigation Involving US Patent 8,355,484

As of May 8, 2026, there is one known litigation involving U.S. Patent No. 8,355,484. The details of the case are as follows:

Case Title: Cerence Operating Company v. Amazon.com, Inc., Amazon.com Services LLC, and Amazon Web Services, Inc.

  • Plaintiff(s): Cerence Operating Company
  • Defendant(s): Amazon.com, Inc., Amazon.com Services LLC, Amazon Web Services, Inc.
  • Jurisdiction: U.S. District Court for the Eastern District of Texas
  • Case Number: 2:26-cv-00372
  • Filing Date: May 3, 2026 (Note: Some sources may also indicate a filing or retrieval date of May 4, 2026).
  • Outcome or Current Status: The case was recently filed and is currently active. The complaint for patent infringement has been filed, and the case is in its initial stages. In a parallel action, Cerence also filed a Section 337 complaint with the U.S. International Trade Commission (ITC) on May 5, 2026, seeking to block imports of allegedly infringing Amazon products.

The lawsuit alleges that certain Amazon products, including the Echo speakers, Echo Show displays, Fire TVs, and Fire tablets, infringe on five of Cerence's patents, including US Patent 8,355,484. The '484 patent relates to methods for masking latency in text-to-speech systems.

Generated 5/8/2026, 10:04:37 PM