PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 11347657. This proceeding, IPR2025-01378, was terminated due to a settlement between the parties before a final written decision was issued. This gives a defendant facing assertion of this patent a neutral defensive posture as no claims were invalidated or sustained by the PTAB.

IPR2025-01378 — [[[Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.), Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.) et al.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.%20et%20al.) v. Radian Memory Systems LLC

• Type: Inter Partes Review
• Filed: 2025-08-05
• Status: Terminated-Settled. The proceeding concluded without a final decision on the merits due to a settlement agreement between the petitioner and the patent owner.
• Judge panel: Information regarding the specific judge panel for this IPR is not publicly available on general search platforms for terminated-settled cases without deep docket access, and the provided prompt context does not include it.
• Petition grounds: Details regarding the specific claims challenged, prior art cited, and statutory bases (§ 102 / § 103 / § 112) of the petition are not readily available in public summaries for settled cases without accessing the petition itself.
• Institution decision: The status "Terminated-Settled" on 2026-01-09, following a filing date of 2025-08-05, indicates that the proceeding likely settled before the institution decision deadline (typically 3 months from the patent owner's preliminary response or 6 months from petition filing). Therefore, an institution decision was likely not issued.
• Final Written Decision: Not issued, as the proceeding was terminated due to settlement.
• Settlement / termination: The proceeding was terminated on 2026-01-09 due to settlement. The specific terms of the settlement are typically confidential between the parties involved.
• Appeal: No appeal was filed, as there was no Final Written Decision to appeal.
• Defensive value: This IPR does not impact the patentability of the claims of US11347657, as it settled before any PTAB decision on the merits. Therefore, a defendant facing assertion of this patent cannot point to any claims having been invalidated by this particular IPR.

Strategic summary

As of today, May 21, 2026, all claims of US Patent 11347657 remain UNTESTED by the PTAB, as the sole IPR proceeding filed against it, IPR2025-01378, was terminated due to settlement. No claims were canceled, nor were any explicitly sustained as patentable by the PTAB. This means the patent's validity has not been evaluated by the PTAB.

Regarding the estoppel landscape, since IPR2025-01378 was terminated-settled before institution or a final written decision, there is no statutory estoppel under 35 U.S.C. § 315(e)(2) for the petitioner (Samsung Electronics Co., Ltd. et al.) or their privies. This implies that the prior-art grounds that could have been raised in IPR2025-01378 might still be available in district court litigation or for future PTAB challenges by different petitioners, assuming no contractual estoppel was part of the confidential settlement. Without knowing the specific grounds raised in the petition, it's impossible to identify precisely which prior-art arguments could have been raised.

There are no clear pattern signals of aggressive PTAB appeals by the patent owner or multiple IPRs from the same petitioner based on the single proceeding on record. The petitioner, Samsung Electronics Co., Ltd. et al., is a significant industry player, and their decision to settle might indicate either a perceived strength of the patent or a strategic business decision, the details of which are confidential. Unified Patents is listed in the Google Patents litigation section as involved in this IPR, suggesting a defensive aggregator may have initiated or funded the challenge, which is a common pattern in patent defense.

Recommended next steps

For a defendant considering challenging US11347657:

• Given the prior IPR was settled, the patent has not been subjected to PTAB scrutiny. A new IPR petition could be a viable defense strategy if strong prior art exists.
• The absence of an institution decision means the PTAB has not yet formally reviewed the merits of any invalidity arguments.
• Consider a thorough prior art search to identify new grounds or re-evaluate the grounds that may have been present in the settled IPR. This will inform the strength of a potential new IPR petition.
• It would be beneficial to review the public records of IPR2025-01378 on the USPTO PTAB E2E system if possible, to understand the petition and the scope of claims challenged, even though no decision was rendered.
• If a demand letter or complaint cites claims of US11347657, understand that these claims have not been legally tested at the PTAB. The lack of prior invalidation means a defendant would bear the burden of proof in challenging the patent.

The PTAB's case information for IPR2025-01378 can be accessed here: https://portal.unifiedpatents.com/ptab/case/IPR2025-01378.