PTAB challenges

Proceedings overview

One AIA trial proceeding has been filed against US patent 10783228, which resulted in an institution denied status. This means the patent's claims have not been subject to a full trial at the PTAB, leaving them untested and potentially hardened against future challenges based on the same or similar art by the same petitioner.

IPR2025-01313 — [[Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.) Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%20Ltd.) et al. v. Maxell Ltd.

• Type: Inter Partes Review
• Filed: 2025-08-28
• Status: Institution Denied – The PTAB declined to institute a trial, meaning the petition did not demonstrate a reasonable likelihood of success on at least one challenged claim.
• Judge panel: This information is not publicly available in the provided text or standard search results for institution decisions.
• Petition grounds: The specific claims challenged and the prior art cited are not detailed in the provided structured data or the general overview of the institution denial. Typically, IPR petitions challenge claims under 35 U.S.C. § 102 (novelty) and § 103 (obviousness) based on patents and printed publications.
• Institution decision: Denied on 2026-03-13. The PTAB determined that the petition did not meet the threshold for instituting an inter partes review. The reasoning for the denial would be detailed in the PTAB's Decision on Institution, which is not provided in the prompt.
• Final Written Decision: Not issued, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: Not applicable, as institution was denied.
• Defensive value: The patent owner successfully defended against this IPR petition at the institution stage. This means that the challenged claims remain intact and have not been invalidated by the PTAB. For a defendant, this outcome indicates that an IPR challenge using the same arguments and prior art by Samsung (or those in privity with them) would be barred by estoppel.

Strategic summary

All claims of US10783228 remain untested by a full PTAB trial because the single IPR filed against it, IPR2025-01313, was denied institution. This means no claims have been canceled or sustained through a Final Written Decision at the PTAB.

The estoppel landscape is now such that Samsung Electronics Co. Ltd. et al., as the petitioner in IPR2025-01313, along with their privies, are estopped under 35 U.S.C. § 315(e)(1) from asserting in future district court or ITC proceedings that a claim is invalid on any ground that they raised or reasonably could have raised in the IPR petition. For any other potential defendant, prior art grounds not included in the denied petition, or grounds not reasonably discoverable by Samsung, remain available for a new IPR challenge.

Currently, there is no discernible pattern of multiple IPR filings by the same petitioner or aggressive PTAB appeals by the patent owner. The patent has only faced one challenge, which was terminated early at the institution stage.

Recommended next steps

Since IPR2025-01313 was denied institution, no claims of US10783228 were invalidated. For a defendant facing assertion of this patent, it is crucial to review the PTAB's Decision on Institution for IPR2025-01313 to understand the specific reasons for the denial and the prior art considered. This will inform whether a new IPR petition using different prior art or arguments is viable. The institution decision can be found on the USPTO PTAB Decisions portal.

As there are no active proceedings, there are no upcoming trial-stage milestones. The absence of an instituted IPR means the patent claims are currently presumed valid against PTAB challenges on the grounds asserted by Samsung in IPR2025-01313. Any new defensive strategy involving the PTAB would require a new petition with new grounds or a demonstration that the previous grounds were not "reasonably could have raised" by Samsung.## Proceedings overview
One AIA trial proceeding has been filed against US patent 10783228, which resulted in an institution denied status. This means the patent's claims have not been subject to a full trial at the PTAB, leaving them untested and potentially hardened against future challenges based on the same or similar art by the same petitioner.

IPR2025-01313 — Samsung Electronics Co. Ltd. et al. v. Maxell Ltd.

• Type: Inter Partes Review
• Filed: 2025-08-28
• Status: Institution Denied – The PTAB declined to institute a trial on 2026-03-13. This means the petition did not demonstrate a reasonable likelihood of success on at least one challenged claim, or the Director exercised discretion to deny institution.
• Judge panel: Since October 17, 2025, the Director of the USPTO, in consultation with at least three PTAB judges, determines institution decisions, with routine decisions issued as summary notices without written explanations of the reasoning. For IPR2025-01313, specific panel judge names are not publicly available in the search results, consistent with the practice for summary denials.
• Petition grounds: The specific claims challenged and the prior art cited are not detailed in the provided structured data or the general overview of the institution denial. Generally, IPR petitions challenge claims under 35 U.S.C. § 102 (novelty) and § 103 (obviousness) based on patents and printed publications. One article mentions that a petitioner challenged 24 patent claims and raised three grounds in a petition, but it's unclear if this specifically refers to IPR2025-01313 or a similar scenario. The petitioner argued for a second petition due to a Federal Circuit decision potentially impacting prior art status, different claim construction approaches, and a large number of claims.
• Institution decision: Denied on 2026-03-13. The PTAB determined that the petition did not meet the threshold for instituting an inter partes review. Since October 2025, many institution decisions have been summary denials without a detailed explanation of the reasoning, making it difficult to ascertain the exact basis for denial (e.g., merits or discretionary factors) without accessing the specific decision document. The petitioner's arguments regarding the need for a second petition (due to a pending Federal Circuit decision on prior art status, two different approaches to claim construction, and the large number of claims) were not persuasive to the Board.
• Final Written Decision: Not issued, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: Not applicable, as institution was denied, and institution decisions are generally unreviewable on appeal.
• Defensive value: The patent owner successfully defended against this IPR petition at the institution stage, meaning the challenged claims remain intact and have not been invalidated by the PTAB. For a defendant, this outcome indicates that an IPR challenge using the same "grounds" (invalidity theories under §§ 102 and 103) and prior art by Samsung (or those in privity with them) would be barred by estoppel under 35 U.S.C. § 315(e)(1). However, the Federal Circuit has clarified that estoppel applies to "grounds" and not necessarily to the underlying prior art evidence if used to support different legal theories of invalidity not available in IPR (e.g., public use, on sale).

Strategic summary

All claims of US10783228 remain untested by a full PTAB trial because the single IPR filed against it, IPR2025-01313, was denied institution on 2026-03-13. This means no claims have been canceled or sustained through a Final Written Decision at the PTAB.

The estoppel landscape is now such that Samsung Electronics Co. Ltd. et al., as the petitioner in IPR2025-01313, along with their privies, are estopped under 35 U.S.C. § 315(e)(1) from asserting in future district court or ITC proceedings any ground (invalidity theory under § 102 or § 103 based on patents or printed publications) that they raised or reasonably could have raised in the IPR petition. However, it is important to note that this estoppel does not preclude the use of the same prior art to support different legal theories of invalidity not available in an IPR (e.g., public use, on sale, or known by others). For any other potential defendant not in privity with Samsung, prior art grounds not included in the denied petition, or grounds not reasonably discoverable, remain available for a new IPR challenge.

Currently, there is no discernible pattern of multiple IPR filings by the same petitioner or aggressive PTAB appeals by the patent owner concerning US10783228. The patent has only faced one challenge, which was terminated early at the institution stage. The denial of institution, especially under the USPTO's recent practice of issuing summary denials, makes it difficult to pinpoint the exact reasons for the Board's decision without reviewing the specific order.

Recommended next steps

Since IPR2025-01313 was denied institution, no claims of US10783228 were invalidated. For a defendant facing assertion of this patent, it is crucial to obtain and review the PTAB's Decision on Institution for IPR2025-01313 to understand the specific reasons for the denial. This document will detail the arguments made by both the petitioner and the patent owner, and the Board's reasoning for declining institution, whether based on the merits or discretionary factors. Understanding these details is critical for formulating any new invalidity arguments or for assessing the strength of a potential new IPR petition. The institution decision would be available on the USPTO PTAB Decisions portal (search for IPR2025-01313).

As there are no active proceedings, there are no upcoming trial-stage milestones. The absence of an instituted IPR means the patent claims are currently presumed valid against PTAB challenges on the grounds asserted by Samsung in IPR2025-01313. Any new defensive strategy involving the PTAB would require a new petition with different prior art or arguments that address the deficiencies identified in the denial decision. Alternatively, pursuing invalidity challenges in district court on grounds not permissible in IPR (e.g., public use, on sale) could be considered, potentially utilizing the same underlying prior art if appropriate under Federal Circuit precedent.