Patent 9402120B2

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 (3)

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Specific litigation cases in our database that name US patent 9402120B2. 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.

✓ Generated

As a patent attorney, I can provide the following information regarding known litigation involving U.S. Patent No. 9,402,120 B2. As of April 26, 2026, Earin AB, the assignee of the '120 patent, has been actively enforcing its patent rights against several companies in the wireless earbud market.

Below is a summary of the known litigation involving this patent:

Earin AB v. Skullcandy, Inc.

  • Plaintiff: Earin AB
  • Defendant: Skullcandy, Inc.
  • Jurisdiction: U.S. District Court for the District of Delaware
  • Case Number: 1:24-cv-00275
  • Filing Date: March 1, 2024
  • Status: Active. In November 2024, the court denied Skullcandy's motion to dismiss the case. The plaintiff, Earin AB, alleges that Skullcandy's Rail ANC True Wireless earbuds infringe on at least claim 20 of the '120 patent. Additionally, Skullcandy has filed a petition for an Inter Partes Review (IPR) of the '120 patent with the U.S. Patent and Trademark Office.

Earin AB v. Sennheiser Electronic Corporation

  • Plaintiff: Earin AB
  • Defendant: Sennheiser Electronic Corporation
  • Jurisdiction: U.S. District Court for the District of Delaware
  • Case Number: 1:24-cv-00274
  • Filing Date: March 1, 2024
  • Outcome: This case has been terminated. A stipulation of dismissal was filed and so ordered by the judge on April 25, 2024, indicating the parties have settled the dispute.

Earin AB v. Audio-Technica U.S., Inc.

  • Plaintiff: Earin AB
  • Defendant: Audio-Technica U.S., Inc.
  • Jurisdiction: U.S. District Court for the Northern District of Ohio
  • Case Number: 5:25-cv-01534
  • Filing Date: July 23, 2025
  • Status: Active. The initial complaint was followed by an amended complaint filed on January 16, 2026, which explicitly includes an allegation of infringement of U.S. Patent No. 9,402,120 B2. The case is in its early stages.

Generated 5/14/2026, 12:45:55 AM