PTAB challenges

Proceedings overview

One active Inter Partes Review (IPR) proceeding has been filed against US patent 11689383. This gives a defendant limited defensive hardening if new assertions are made on previously challenged claims.

IPR2025-01179 — CentralSquare Technologies, LLC v. Carbyne Ltd.

• Type: Inter Partes Review
• Filed: 2025-06-27
• Status: Trial Instituted. The PTAB has decided to proceed with a review of the challenged claims.
• Judge panel: Not publicly available in the provided information for this specific case. However, some PTAB judges active around this time include James A. Tartal, Frances L. Ippolito, Jeffrey N. Fredman, and Ken B. Barrett.
• Petition grounds: Specific claims, prior art, and statutory bases (§ 102 / § 103 / § 112) are not detailed in the provided information.
• Institution decision: Instituted on 2025-06-27. The specific reasoning for institution is not provided in the prompt.
• Final Written Decision (if issued): Not yet issued. The PTAB typically has a one-year deadline from institution to issue a Final Written Decision.
• Settlement / termination: No settlement or termination information is available yet.
• Appeal: No appeal information is available yet, as no Final Written Decision has been issued.
• Defensive value: This active IPR indicates that the patentability of at least some claims is currently being challenged. The outcome will be critical in determining the strength of the patent. If claims are invalidated, it could significantly weaken any assertion built on those claims.

Strategic summary

Currently, there is one active IPR, IPR2025-01179, challenging US patent 11689383. The claims under review in this IPR are currently untested as a Final Written Decision has not yet been issued. Therefore, it is not possible to definitively state which claims are canceled or sustained.

The estoppel landscape will depend on the outcome of IPR2025-01179. If the IPR proceeds to a Final Written Decision, CentralSquare Technologies, LLC (and its privies) would be estopped from asserting invalidity grounds that were raised or reasonably could have been raised in the IPR for any claims ultimately found patentable. For other potential defendants, the specific prior-art grounds challenged in IPR2025-01179 may still be available if they are not in privy with CentralSquare Technologies, LLC.

There is no observable pattern of multiple IPRs filed by the same petitioner, nor is there information about the patent owner's history of appealing PTAB decisions for this specific patent. Unified Patents, Inc. is listed as a plaintiff in the Litigation Summary, and CentralSquare Technologies, LLC is the petitioner for IPR2025-01179, suggesting potential involvement of a defensive aggregator.

Recommended next steps

Since IPR2025-01179 is currently instituted, the next key milestone will be the Final Written Decision, which is typically due within one year of institution (i.e., by approximately 2026-06-27). This decision will determine the patentability of the challenged claims.