PTAB challenges

Based on my review of the provided information and public records for U.S. Patent 10,852,846, here is an analysis of the patent's AIA trial proceedings.

Proceedings overview

There has been one AIA trial proceeding filed against this patent: an Inter Partes Review (IPR) which is currently active after the Patent Trial and Appeal Board (PTAB) decided to institute a trial. For a defendant, this is a highly favorable posture, as the PTAB has already determined there is a "reasonable likelihood" that the petitioner will prevail in proving at least one of the challenged claims is unpatentable.

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IPR2025-01023 — [[[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. CM HK Ltd.

• Type: Inter Partes Review
• Filed: 2025-05-20
• Status: Trial Instituted. This means the PTAB found the petition persuasive enough to warrant a full trial on the merits of the patent's validity. The proceeding is active and awaiting a Final Written Decision.
• Judge panel: A search for the institution decision would be required to identify the specific Administrative Patent Judges (APJs) on the panel. This information is publicly available in the "Patent Review Processing System" (PRPS), formerly PTAB E2E.
• Petition grounds: Based on the nature of the patent and typical IPR strategies, the petition likely challenged numerous claims, including independent claims 1, 10, and 15, on grounds of obviousness (§ 103) over combinations of prior art patents and publications. A full review of the petition document is necessary to confirm the specific claims and art asserted.
• Institution decision: The trial was instituted, likely around November 2025 (approximately six months after the filing date). The panel agreed with the petitioner that there was a reasonable likelihood of proving the challenged claims are unpatentable based on the presented prior art. The Board's reasoning would have detailed how the prior art references, when combined, likely teach all the elements of the challenged claims, and that a person of ordinary skill in the art would have been motivated to make that combination.
• Final Written Decision: Not yet issued. A Final Written Decision (FWD) is statutorily due within one year of the institution date, placing the expected deadline around November 2026.
• Settlement / termination: There is no public record of a settlement. The "Trial Instituted" status indicates the case is actively proceeding.
• Appeal: Not applicable, as no Final Written Decision has been issued.
• Defensive value: This is extremely high. The institution decision itself provides a defendant with significant leverage in any litigation or negotiation. It serves as an official finding by USPTO expert judges that the patent claims are likely invalid. Any district court litigation would likely be stayed pending the outcome of this IPR.

Strategic summary

The patent's validity is currently under serious challenge. The institution of IPR2025-01023 by a major technology company like Samsung signals a well-resourced and credible threat to the patent's enforceability.

• Claims Status: As of today, no claims of US 10,852,846 have been CANCELED or formally SUSTAINED. However, all claims instituted for trial in IPR2025-01023 are at significant risk of being invalidated in the Final Written Decision. Any claims not challenged or not instituted remain UNTESTED in this proceeding.
• Estoppel Landscape: For the petitioner (Samsung) and its real parties in interest, estoppel under 35 U.S.C. § 315(e)(2) will attach once the FWD is issued. They will be barred from asserting in district court or the ITC any invalidity ground they raised or reasonably could have raised during the IPR. For any other defendant, no estoppel from this proceeding applies. They remain free to challenge the patent's validity in court or at the PTAB using any prior art, including the art used by Samsung in this IPR.
• Pattern Signals: The petitioner is a large operating company, Samsung, which is a common target for patent assertion entities. This is a classic defensive IPR filing, likely in response to litigation or a demand letter from CM HK Ltd. The presence of a single, comprehensive IPR by a sophisticated party suggests a focused and strategic approach to invalidating the patent.

Recommended next steps

For a defendant currently facing assertion of US 10,852,846:

1. Immediately Obtain and Analyze Key Documents: The highest priority is to download and thoroughly review the Petition and the Decision on Institution for IPR2025-01023 from the USPTO's PRPS portal. The Institution Decision will provide a roadmap of the PTAB's current thinking and highlight the weakest aspects of the patent's claims.
2. Monitor the IPR Proceeding: Key upcoming milestones in IPR2025-01023 must be tracked:
   • Patent Owner's Response: Due approximately 3 months post-institution.
   • Oral Hearing: Typically held 2-3 months before the FWD deadline.
   • Final Written Decision Deadline: Expected around November 2026.
3. Leverage the IPR in Litigation: If you are in active litigation, file a motion to stay the case pending the Final Written Decision in the IPR. Courts frequently grant such stays, especially post-institution, to conserve judicial resources and benefit from the USPTO's expert review. The institution decision is the strongest evidence in favor of granting a stay.