PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 11227303. This proceeding is currently active and pending, meaning no claims have been invalidated or sustained by the PTAB yet. This gives a defendant facing assertion of this patent an opportunity to monitor the outcome of the ongoing challenge.

IPR2026-00255 — Cisco Systems, Inc. v. Vusura Technology LLC

• Type: Inter Partes Review
• Filed: 2026-02-24
• Status: Pending. This IPR is currently in its initial stages, and an institution decision has not yet been issued.
• Judge panel: Not yet publicly available at this early stage of the proceeding.
• Petition grounds: Details regarding the specific claims challenged, the prior art cited, and the statutory bases (§ 102 / § 103) are not yet publicly available through general search results at this early stage of a pending IPR.
• Institution decision: As of 2026-05-29, an institution decision for IPR2026-00255 has not been issued. The statutory deadline for the institution decision is typically within six months of the petition filing, which would be around August 24, 2026.
• Final Written Decision: Not applicable; the proceeding is pending institution.
• Settlement / termination: Not applicable; the proceeding is pending institution.
• Appeal: Not applicable; the proceeding is pending institution.
• Defensive value: This active IPR presents a potential avenue for challenging the patent's validity. If the PTAB institutes the IPR, the asserted claims will be subject to review, potentially leading to their cancellation. A defendant facing assertion should closely monitor this proceeding, as an institution decision could significantly impact the strength of the patent.

Strategic summary

All claims of US11227303 remain UNTESTED by a Final Written Decision in an AIA trial proceeding. The sole IPR, IPR2026-00255, is currently pending its institution decision. As such, no claims have been canceled or sustained by the PTAB.

The estoppel landscape is not yet defined, as there is no Final Written Decision. If IPR2026-00255 proceeds to a Final Written Decision, Cisco Systems, Inc. (and its privies) would be estopped from raising any grounds they raised or reasonably could have raised in a later proceeding against the patent. However, for other potential defendants, all prior-art grounds remain available until a specific FWD is issued.

The filing of IPR2026-00255 by Cisco Systems, Inc. indicates that at least one significant entity believes there are valid grounds to challenge the patent. The fact that this is the first and only IPR to date suggests that while the patent owner (Vusura Technology LLC) is currently involved in litigation (as noted in the Patent Summary and Litigation Summary), the patent's validity has not yet faced a multitude of challenges at the PTAB.

Recommended next steps

For any defendant currently facing assertion of US11227303, the most critical next step is to closely monitor the ongoing IPR2026-00255. The institution decision is anticipated around August 24, 2026. A decision to institute the IPR would signal that the PTAB believes there is a reasonable likelihood that at least one challenged claim is unpatentable, significantly impacting the patent's strength.

If the IPR is instituted, tracking the trial-stage milestones, including any oral hearing dates and the eventual Final Written Decision due date (typically one year from institution), will be crucial. The outcome of this IPR could provide strong defensive arguments or invalidate claims foundational to any infringement theory.

Currently, there is no PTAB Final Written Decision to link to, as the proceeding is pending.