PTAB challenges

Proceedings overview

Currently, there is one active AIA trial proceeding on US patent 12079667: IPR2026-00297, which is in a pending status. This means the patent's claims are currently undergoing review by the PTAB, and no final decision on their validity has been issued yet. The bottom-line defensive posture for a defendant is that the patent's claims are actively being challenged, and the outcome of this IPR could significantly impact future assertion strategies.

IPR2026-00297 — Microsoft Corporation v. Vipul Pabari (Patent Owner of Record in this IPR)

• Type: Inter Partes Review
• Filed: 2026-03-07
• Status: Pending. The proceeding is ongoing before the Patent Trial and Appeal Board.
• Judge panel: Information on the specific judge panel is not yet publicly available in the provided data.
• Petition grounds: Details regarding the specific claims challenged, the prior art cited, and the statutory bases (§ 102 for anticipation, § 103 for obviousness, or § 112 for indefiniteness/written description/enablement) are not available in the provided data and would typically be found in the filed petition, which is not included here.
• Institution decision: The institution decision has not yet been issued, as the case is pending. The deadline for the institution decision is typically six months from the filing of the preliminary response, or three months from the filing of a patent owner response if one is filed after a preliminary response. Given the filing date of 2026-03-07, the institution decision is still anticipated.
• Final Written Decision: Not applicable; a Final Written Decision has not been issued as the proceeding is pending.
• Settlement / termination: Not applicable; the proceeding is pending.
• Appeal: Not applicable; there has been no Final Written Decision to appeal.
• Defensive value: This active IPR means that the validity of the patent's claims is under scrutiny. A defendant facing assertion could benefit if claims are ultimately invalidated. However, if institution is denied or claims are sustained, it could strengthen the patent owner's position against future challenges.

Strategic summary

Currently, the validity of claims in US12079667 is being challenged in IPR2026-00297. As of today, 2026-05-29, this proceeding is still pending, and no institution decision or Final Written Decision (FWD) has been issued. Therefore, all claims of US12079667 are currently UNTESTED by a final PTAB decision. The patent's original assignee was TOUTVIRTUAL Inc., and it was reassigned to WYE IP CAPITAL LLC on 2025-09-29. The "PTAB proceedings on file" section states "petitioner: Microsoft Corporation" and "inventor: Vipul Pabari" in the context of the IPR party, which is an unusual listing for a patent owner in an IPR and differs from the listed assignee. However, based on the provided canonical data, Microsoft Corporation is the petitioner.

Since there is no FWD, the estoppel landscape under 35 U.S.C. § 315(e)(2) is not yet relevant. Once an FWD is issued, the petitioner (Microsoft Corporation, and any parties in privity with them) would be barred from asserting in future civil actions or other USPTO proceedings any invalidity ground that they raised or reasonably could have raised in the IPR against the claims that were found patentable. This initial IPR is a critical event for the patent, as its outcome will either harden or weaken the patent for future assertions.

The presence of Unified Patents in the Google Patents metadata as a petitioner for IPR2026-00297, while the "PTAB proceedings on file" lists Microsoft Corporation, suggests a potential discrepancy. Unified Patents is known as a defensive aggregator that often files IPRs on behalf of its members to deter patent assertion, and Microsoft is a large operating company that may also initiate IPRs directly. For this analysis, we are strictly adhering to the "PTAB proceedings on file" which lists Microsoft Corporation as the petitioner.

Recommended next steps

• Monitor IPR2026-00297 closely: As a defendant, it is critical to track the progress of IPR2026-00297. The next significant milestone will be the Institution Decision, which is expected within the statutory timeframe (typically six months from the filing of the preliminary response). If the PTAB decides to institute the IPR, it means they found a reasonable likelihood that at least one challenged claim is unpatentable, which would be a positive development for a defendant.
• Review Petition and Patent Owner Response (if publicly available): If the IPR proceeds to institution, obtaining and reviewing the petition filed by Microsoft Corporation and any Patent Owner Response will be crucial. These documents will detail the specific claims challenged, the prior art presented, and the arguments made by both sides.
• Assess Impact of Institution Decision: If claims are instituted, a defendant should evaluate whether the grounds of unpatentability raised align with their own potential invalidity defenses. If the IPR is not instituted, it signals that the PTAB found the petition unconvincing, which may suggest higher hurdles for future IPRs on similar grounds.
• Anticipate FWD: If the IPR is instituted, the Final Written Decision is typically due within one year of institution. This decision will provide the definitive PTAB ruling on the patentability of the challenged claims.