Patent 9402120

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 9402120. 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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As a patent attorney, I can confirm the following litigation involving U.S. Patent No. 9,402,120.

Litigation Summary for U.S. Patent No. 9,402,120

1. 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 March 2024, Earin filed a complaint alleging that Skullcandy's products directly infringe on at least claim 20 of the '120 patent. Skullcandy's motion to dismiss the first amended complaint was denied on November 14, 2024. The case is ongoing.

  • Related IPR Petition: Skullcandy, Inc. filed a petition for Inter Partes Review (IPR) of claims 20 and 21 of U.S. Patent No. 9,402,120.

    • Case Number: IPR2025-00690
    • Status: Skullcandy has stipulated that it will not pursue the specific grounds asserted in its IPR petition in the district court litigation if the petition is granted. Should the petition be denied, Skullcandy reserves the right to present those same invalidity grounds in the district court case.

2. Earin AB v. Skullcandy, Inc.

  • Plaintiff: Earin AB
  • Defendant: Skullcandy, Inc.
  • Jurisdiction: U.S. District Court for the District of Delaware
  • Case Number: 1:25-cv-00712
  • Filing Date: June 6, 2025
  • Status: Active. This lawsuit targets newly released Skullcandy products. A claim construction hearing is scheduled for May 22, 2026, and a jury trial is scheduled for May 3, 2027.

3. 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: 1:2024cv00274
  • Filing Date: March 1, 2024
  • Outcome: The case was terminated. A stipulation of dismissal was granted on April 25, 2024.

4. 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: 5:2025cv01534
  • Filing Date: July 23, 2025
  • Status: Active. Earin AB filed a complaint for patent infringement. An amended complaint was filed on January 16, 2026. The case is ongoing.

At present, no other litigation involving US patent 9,402,120 is publicly known.

Generated 5/14/2026, 12:45:25 AM