PTAB challenges

Based on the single inter partes review (IPR) filed against U.S. Patent No. 9,929,240, the patent's claims remain legally intact, as the proceeding was terminated through a settlement before the Patent Trial and Appeal Board (PTAB) could rule on the merits of the challenge. This posture means that while the patent has been challenged, its validity has not been affirmed or denied by the PTAB, leaving it vulnerable to future validity challenges in court or at the USPTO.

IPR2025-01283 — Sandisk Technologies, Inc. et al. v. Longitude Flash Memory Solutions Ltd.

• Type: Inter Partes Review
• Filed: 2025-10-14
• Status: Terminated-Settled (as of 2026-02-20). This means the petitioner and patent owner reached a mutual agreement to end the proceeding before the PTAB issued a Final Written Decision.
• Judge Panel: Information on the Administrative Patent Judge (APJ) panel is not publicly available as the case was terminated before the institution phase, where the panel is typically identified.
• Petition Grounds: The petition for IPR has not been made publicly available yet, so the specific claims challenged and the prior art asserted are not known at this time. Typically, IPRs are based on grounds of anticipation (§ 102) or obviousness (§ 103) using prior art patents and printed publications.
• Institution Decision: The proceeding was terminated on 2026-02-20, approximately four months after the petition was filed. This is before the PTAB's deadline to issue a decision on whether to institute a trial. Therefore, the Board never made a determination on the merits of the petitioner's arguments.
• Final Written Decision: No Final Written Decision was issued because the proceeding was terminated.
• Settlement / Termination: The parties filed a joint motion to terminate the proceeding due to settlement. The terms of such agreements are almost always confidential.
• Appeal: There was no Final Written Decision, so no appeal to the U.S. Court of Appeals for the Federal Circuit was possible.
• Defensive Value: This proceeding offers significant value to a potential defendant. The fact that a well-funded entity like Sandisk invested in filing an IPR suggests they identified potentially strong invalidity arguments. Although the case settled, the IPR petition itself (once available) will serve as a detailed roadmap of prior art and invalidity contentions that can be used by others. Because the case was terminated before a final decision, no statutory estoppel applies to Sandisk or any other party.

Strategic Summary

• Claim Status: All claims of U.S. Patent No. 9,929,240 remain valid and enforceable. No claims are CANCELED or have been finally adjudicated as patentable by the PTAB. All claims are currently UNTESTED in an AIA trial.
• Estoppel Landscape: Critically for any future defendant, no estoppel under 35 U.S.C. § 315(e) attaches from this proceeding. Estoppel only applies to a petitioner after a Final Written Decision is issued. This means that another party is free to file a new IPR using the same (or different) grounds and prior art. The petitioner, Sandisk, could even file a new IPR on different grounds.
• Pattern Signals: The patent is owned by Longitude Flash Memory Solutions Ltd., which is a known patent assertion entity. The settlement with Sandisk follows a common pattern where a validity challenge at the PTAB pressures the patent owner into a license agreement. The short time between filing and settlement suggests the patent owner may have been keen to avoid a PTAB decision on the merits, which could be a signal of perceived weakness in the patent's validity.

Recommended Next Steps

• Obtain the IPR File Wrapper: The most critical next step for any defendant is to obtain the complete file for IPR2025-01283 from the USPTO's PTAB E2E portal. The petition document, though not yet publicly indexed, will contain a full analysis of the patent claims and the prior art that Sandisk believed rendered them invalid. This is an invaluable, pre-packaged starting point for your own invalidity defense.
• Analyze the Asserted Prior Art: Once the petition is obtained, a thorough analysis of the prior art and arguments raised by Sandisk is necessary. This will inform your own non-infringement and invalidity contentions and help assess the overall strength of the patent.
• Monitor for Future Litigation/PTAB Challenges: Given that the patent is held by an assertion entity and the first IPR settled, it is likely that U.S. Patent No. 9,929,240 will be asserted against others. Monitor litigation and PTAB dockets for new cases, as other defendants may also challenge the patent's validity.