Patent 9560176

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 9560176. 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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US Patent 9,560,176, titled "Correlating packets in communications networks," has been involved in multiple litigation cases. The patent is currently assigned to Centripetal Networks LLC.

Here is a summary of the known litigation:

1. District Court Litigation

  • Plaintiff(s): Centripetal Networks, Inc. (later Centripetal Networks, LLC)
  • Defendant(s): Cisco Systems, Inc.
  • Jurisdiction: U.S. District Court for the Eastern District of Virginia
  • Case Number: 2:18-cv-00094 (E.D. Va.)
  • Filing Date: February 13, 2018
  • Outcome/Current Status: Initially, the district court found Cisco to have willfully infringed the asserted claims, including those of US9560176. However, this judgment was vacated by the Federal Circuit (case 21-1888) due to a judicial conflict of interest. On remand, a new judge concluded that Cisco's products did not infringe the '176 patent.

2. First Federal Circuit Appeal

  • Plaintiff(s) (Appellee): Centripetal Networks, Inc.
  • Defendant(s) (Appellant): Cisco Systems, Inc.
  • Jurisdiction: U.S. Court of Appeals for the Federal Circuit
  • Case Number: 21-1888
  • Filing Date: Filed in 2021 (a brief was filed on August 27, 2021).
  • Outcome/Current Status: The Federal Circuit vacated the initial district court judgment and remanded the case due to the district judge's recusal issues.

3. Second Federal Circuit Appeal

  • Plaintiff(s) (Appellant): Centripetal Networks, LLC
  • Defendant(s) (Appellee): Cisco Systems, Inc.
  • Jurisdiction: U.S. Court of Appeals for the Federal Circuit
  • Case Number: 24-2097
  • Filing Date: Filed in 2024.
  • Outcome/Current Status: On April 29, 2026, the Federal Circuit affirmed the district court's judgment of noninfringement regarding the '176 patent, finding that Cisco's products do not correlate packet ingress and egress records or automatically generate and implement new rules without human intervention as required by the asserted claims.

4. PTAB Inter Partes Review (IPR) Cases
US Patent 9,560,176 was also subject to multiple Inter Partes Review petitions before the Patent Trial and Appeal Board (PTAB). For these cases, the specific petitioner(s) and patent owner(s) (likely Centripetal Networks LLC) and precise filing dates are not readily available through general public search results.

  • Case Number: IPR2021-01521
    • Jurisdiction: PTAB
    • Filing Date: Filed in 2021.
    • Outcome/Current Status: Not Instituted - Merits
  • Case Number: IPR2018-01655
    • Jurisdiction: PTAB
    • Filing Date: Filed in 2018.
    • Outcome/Current Status: Not Instituted - Merits
  • Case Number: IPR2018-01654
    • Jurisdiction: PTAB
    • Filing Date: Filed in 2018.
    • Outcome/Current Status: Not Instituted - Merits

5. Worldwide Family Litigation
Google Patents indicates that "First worldwide family litigation filed" related to US9560176, with a link to Darts-ip. Without direct access to Darts-ip's specific case page for US9560176, further details regarding a distinct non-US litigation case are not available from general public search results.

Generated 6/26/2026, 12:46:00 PM