PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 11307995, which terminated in a settlement. This means no claims were invalidated or sustained by a Final Written Decision from the PTAB. The patent's claims remain untested by a full PTAB trial. For a defendant, this indicates that the patent owner faced a challenge but resolved it without a definitive ruling on patentability.

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IPR2025-01376 — [[[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 ended due to a settlement between the parties before a Final Written Decision was issued.
• Judge panel: Information regarding the specific judge panel is not immediately available from public search results for settled cases without an Institution Decision or FWD.
• Petition grounds: Details regarding specific claims challenged, prior art references, and statutory bases (§ 102 / § 103 / § 112) for the petition grounds are typically disclosed in the petition and institution decision documents. Since the case settled, a full public record of these may not be readily available without accessing the full PTAB record for the case.
• Institution decision: Given the "Terminated-Settled" status, it's highly probable the IPR was instituted, as settlements often occur after institution but before a Final Written Decision. However, specific details and the institution date require access to the PTAB record, which is not available via standard public search for this settled case.
• Final Written Decision (if issued): No Final Written Decision was issued as the proceeding terminated due to settlement.
• Settlement / termination: The proceeding was terminated on 2026-01-09 due to a settlement between Samsung Electronics Co., Ltd. et al. and Radian Memory Systems LLC. The terms of the settlement are generally confidential and not publicly disclosed.
• Appeal: No appeal to the Federal Circuit occurred, as the case settled prior to a Final Written Decision.
• Defensive value: This proceeding indicates that Samsung Electronics Co., Ltd. and other petitioners found sufficient grounds to challenge the patent, leading to a settlement. While no claims were invalidated by the PTAB, the settlement might suggest some perceived weakness in the patent or a strategic business decision to avoid the cost and uncertainty of trial. For a new defendant, the claims of US11307995 remain legally untested by a final PTAB decision.

Strategic summary

All claims of US11307995 remain UNTESTED by a Final Written Decision from the PTAB. The single IPR filed, IPR2025-01376, was initiated by Samsung Electronics Co., Ltd. et al. but terminated in a settlement before reaching a final adjudication on the merits of patentability. This means there is no PTAB ruling that has canceled or sustained any specific claims.

Regarding the estoppel landscape, if IPR2025-01376 was indeed instituted (which is likely given the settlement), then Samsung Electronics Co., Ltd. et al. and their privies would be estopped under § 315(e)(2) from asserting in future litigation or PTAB proceedings any ground of unpatentability that they raised or reasonably could have raised during the IPR. However, for a different defendant facing assertion of this patent today, all prior-art grounds remain potentially available for challenge in a new IPR, as no claims have been definitively upheld or invalidated by the PTAB.

The pattern signal here is that a major industry player (Samsung) initiated a challenge, suggesting they found potentially invalidating prior art. The settlement indicates a mutual agreement to resolve the dispute, which could be for various reasons, including the patent owner's desire to avoid a public ruling on patentability or the petitioner achieving their strategic goals through the settlement.

Recommended next steps

As a defendant, it's important to understand the specifics of the IPR2025-01376 petition if possible, as it would indicate the strongest prior art identified by Samsung. However, without a public institution decision or Final Written Decision, those details are not readily available. Given that no claims have been invalidated by the PTAB, a defendant facing assertion of US11307995 would need to conduct their own prior art search and analysis to determine the strength of a potential new IPR challenge or other invalidity defenses. The absence of a PTAB decision means that the claims are still presumed valid and a new challenge would need to establish a reasonable likelihood of success to be instituted.

Citation:
IPR2025-01376. "IPR2025-01376 - Unified Patents PTAB Data". Unified Patents. Accessed May 21, 2026. https://portal.unifiedpatents.com/ptab/case/IPR2025-01376