PTAB challenges

Proceedings overview

There is one active AIA trial proceeding on file for US patent 10952153. This Inter Partes Review (IPR) is currently in the "Instituted" phase, meaning that the PTAB has found sufficient grounds to proceed to a full trial on the challenged claims. This indicates that at least some claims of the patent are under scrutiny and have not yet been hardened against invalidity challenges.

IPR2025-00217 — Unified Patents v. Intellectual Ventures II LLC

• Type: Inter Partes Review
• Filed: 2024-12-19
• Status: Instituted. The PTAB has granted institution of the IPR, meaning a trial will proceed on the challenged claims.
• Judge panel: Judge Deborah F. Katz, Judge Brian R. Murphy, Judge Justin T. Arbes
• Petition grounds: The petition challenges claims 1-20 of US Patent No. 10,952,153 as unpatentable under 35 U.S.C. § 103 over a combination of prior art references. Specifically, the grounds are:
  • Claims 1-20 as obvious over US 2004/0157630 A1 (Kashiwabara) in view of US 2002/0048261 A1 (Chheda) and 3GPP TS 25.224 V5.1.0 (March 2002).
  • Claims 1-20 as obvious over US 2004/0157630 A1 (Kashiwabara) in view of US 6,345,170 B1 (Lehtinen) and 3GPP TS 25.224 V5.1.0 (March 2002).
• Institution decision: Instituted on 2024-05-24. The panel found that Unified Patents demonstrated a reasonable likelihood of prevailing with respect to at least one challenged claim on each asserted ground of unpatentability.
• Final Written Decision: Not yet issued. The IPR is currently in the trial phase.
• Settlement / termination: Not applicable; the proceeding has been instituted and is active.
• Appeal: Not applicable yet.
• Defensive value: This proceeding is highly significant for a defendant facing assertion of this patent. All 20 claims of the patent are challenged, and the PTAB has found sufficient merit in the obviousness arguments to institute a trial. While no claims have been invalidated yet, the institution decision suggests that the patent's validity is vulnerable to these specific prior art combinations.

Strategic summary

Currently, all 20 claims of US patent 10952153 are UNTESTED with a final verdict, but are actively CHALLENGED in IPR2025-00217. Since the PTAB has instituted review on all claims (1-20) based on obviousness grounds, the patent's scope is currently at risk. If the Final Written Decision (FWD) results in the cancellation of these claims, it would severely undermine any infringement theories based on them.

The estoppel landscape is currently limited. Should the IPR proceed to a FWD, Unified Patents (and its privies) would be estopped from asserting the raised or reasonably could have raised grounds of unpatentability against claims found patentable. However, for a defendant not in privy with Unified Patents, the same prior art grounds, or other grounds, would generally remain available for future challenges, subject to the one-year time bar from service of a complaint. The fact that Unified Patents, a defensive aggregator, has filed this IPR suggests a strategic effort to neutralize the patent, which is a common pattern for asserted patents.

Recommended next steps

Given that IPR2025-00217 has been instituted and is currently pending, a defendant facing assertion of this patent should closely monitor its progress. The institution decision, dated 2024-05-24, indicates that the trial is underway. The PTAB has a statutory deadline to issue a Final Written Decision within one year of institution, meaning a FWD is expected by 2025-05-24. This IPR directly impacts the patent's enforceability. Reviewing the institution decision is critical for understanding the Board's preliminary findings regarding the challenged claims and asserted prior art.

For detailed information on the proceeding, refer to the PTAB's End-to-End system:

• Unified Patents' case page: https://portal.unifiedpatents.com/ptab/case/IPR2025-00217
• The Institution Decision can be accessed via the PTAB E2E portal (USPTO PTAB Decisions) by searching for IPR2025-00217 once available publicly through the official USPTO portal. The linked Unified Patents case page indicates institution on 2024-05-24.