PTAB challenges

Proceedings overview

One AIA trial proceeding has been filed against US patent 11177887, currently in "Trial Instituted" status. This means the patent owner's claims are actively being challenged, and the outcome is pending. For a defendant, this presents an opportunity as the validity of the patent's claims is currently under review by the PTAB.

IPR2026-00123 — Eoptolink Technology USA Inc. et al. v. Applied Optoelectronics Inc.

• Type: Inter Partes Review
• Filed: 2025-12-01
• Status: Trial Instituted – The PTAB has decided to initiate a review of the challenged claims.
• Judge panel: Not yet publicly available.
• Petition grounds: Not publicly available yet.
• Institution decision: Instituted – 2026-05-12. The PTAB determined that there is a reasonable likelihood that the petitioner would prevail with respect to at least one of the claims challenged in the petition.
• Final Written Decision (if issued): Not yet issued.
• Settlement / termination: Not yet settled or terminated.
• Appeal: No appeal yet, as a Final Written Decision has not been issued.
• Defensive value: The institution of this IPR indicates that the PTAB found sufficient merit in the petitioner's challenge to warrant a full review of the patent claims. This means the claims under review are currently vulnerable. A defendant facing assertion of this patent may be able to leverage this active IPR to stay litigation or negotiate more favorable terms, as the patent's validity is uncertain.

Strategic summary

The patent 11177887 currently has one active Inter Partes Review, IPR2026-00123, which was instituted on 2026-05-12. As the proceeding is still in progress, no claims of 11177887 are yet canceled or sustained. All claims remain untested until a Final Written Decision is issued. The patent owner is Applied Optoelectronics Inc., and the petitioner is Eoptolink Technology USA Inc. et al.

Regarding the estoppel landscape, since the IPR is still active and no Final Written Decision has been issued, the estoppel provisions of 35 U.S.C. § 315(e)(2) are not yet in effect. Once a Final Written Decision is issued, the petitioner (Eoptolink Technology USA Inc. et al.) and its privies will be estopped from asserting invalidity on any ground raised or that reasonably could have been raised during the IPR. For a defendant currently being asserted against, this means that prior-art grounds not being litigated in IPR2026-00123 may still be available for a separate challenge or defense. The active IPR itself is a strong signal that the patent is being asserted or is considered a threat in the market, prompting a challenge by Eoptolink Technology USA Inc. et al.

Recommended next steps

As IPR2026-00123 is currently in "Trial Instituted" status, the next key milestone will be the issuance of the Final Written Decision, which is due within one year of institution (approximately by 2027-05-12). It is crucial to monitor the progress of this IPR closely for claim-level outcomes.
The IPR proceeding can be tracked via the USPTO PTAB E2E system.