Netlist v. Samsung & Micron: Federal Circuit Affirms Patent Unpatentable (24-1521)
Netlist, Inc. lost its appeal at the Federal Circuit after Samsung Electronics and Micron Technology successfully challenged US10860506B2, a patent covering timing-controlled data buffering in memory modules. A per curiam panel of three circuit judges affirmed the unpatentability ruling in a case that ran 651 days from filing to close.
Federal Circuit closes Netlist’s memory buffer patent appeal against Samsung and Micron
Netlist, Inc., a memory technology company, appealed to the United States Court of Appeals for the Federal Circuit (Case No. 24-1521) seeking to overturn an unpatentability determination affecting US10860506B2, a patent directed at timing-controlled data buffering in memory modules. The appeal named Samsung Electronics Co., Ltd. and three Micron entities — Micron Technology, Inc., Micron Semiconductor Products, Inc., and Micron Technology Texas, LLC — as respondents. The case was filed on 27 February 2024.
The Federal Circuit issued a per curiam affirmance on 9 December 2025, with Circuit Judges Lourie, Prost, and Cunningham finding no reversible error in the underlying invalidity and cancellation determination. The basis of termination is recorded as ‘Unpatentable,’ meaning US10860506B2 was cancelled and Netlist retains no enforceable rights under it against Samsung, Micron, or any third party.
The 651-day duration is consistent with typical Federal Circuit appeal timelines for contested patentability proceedings. The per curiam format — an unsigned opinion issued in the name of the court — suggests the panel considered the legal questions sufficiently settled to require no extended individual analysis, which typically signals a clear-cut affirmance on the merits. The public record does not disclose whether a written opinion elaborating on claim construction or prior art findings accompanies the judgment.
Filing to Unpatentable in 651 days
651 days — above average for a Federal Circuit patentability appeal
Federal Circuit affirms: what the unpatentability ruling means for both parties
Affirmance means the lower unpatentability decision stands without error
When the Federal Circuit ‘affirms,’ it confirms that the tribunal below — most likely the Patent Trial and Appeal Board — committed no reversible legal or factual error in cancelling US10860506B2. The appellate court does not retry the case; it reviews whether the lower decision was legally sound. A per curiam affirmance by Judges Lourie, Prost, and Cunningham suggests the panel found the outcome sufficiently clear to issue a joint, unsigned ruling.
No reversible error foundUS10860506B2 is cancelled — Netlist loses enforceability
For Netlist, the affirmance is final at this appellate level. US10860506B2 is no longer enforceable, eliminating its use as a licensing or litigation asset against Samsung, Micron, or any other memory manufacturer. Netlist could theoretically petition the Supreme Court for certiorari, but such petitions face very high denial rates. Any parallel district court infringement actions relying on this patent face immediate invalidity risk.
Patent cancelled; no enforcement rightsSamsung and Micron secure freedom to operate on this patent
Samsung Electronics and the three Micron entities achieved a complete outcome: the patent asserted against their memory module products has been cancelled and the cancellation affirmed on appeal. This removes US10860506B2 as a litigation threat and forecloses Netlist from reviving it through further Federal Circuit review. The result strengthens both companies’ freedom to operate in timing-controlled data buffering technology without royalty exposure under this specific patent.
Full FTO secured on US10860506B2Memory sector gets one fewer patent barrier on buffer timing IP
The cancellation of US10860506B2 narrows the IP thicket around timing-controlled data buffering in memory modules — a technology central to DDR and load-reduced DIMM architectures. Competitors and licensees who previously faced potential claims under this patent benefit from its removal. However, Netlist holds a broader portfolio of memory-related patents, and this outcome does not necessarily reduce its overall enforcement posture across that portfolio.
Reduced IP barrier in memory bufferingFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Netlist, Inc. | Company | Memory technology IP licensor — holder of US10860506B2 (timing-controlled data buffering)Search in Eureka ↗ |
| Defendant | Samsung Electronics Co., Ltd. | Company | Samsung Electronics Co., Ltd. — global semiconductor manufacturer; Micron Technology entitiesSearch in Eureka ↗ |
| Co-Defendant | Micron Technology, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | Micron Semiconductor Products, Inc. | Company | Search in Eureka ↗ |
| Co-Defendant | Micron Technology Texas, LLC | Company | Search in Eureka ↗ |
| Plaintiff counsel | Hong Annita Zhong | Attorney | Counsel for Netlist, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Jason Sheasby | Attorney | Counsel for Netlist, Inc.Search in Eureka ↗ |
| Plaintiff counsel | John Hylton | Attorney | Counsel for Netlist, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Jonathan M. Lindsay | Attorney | Counsel for Netlist, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Richard Crudo | Attorney | Counsel for Netlist, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Richard M. Bemben | Attorney | Counsel for Netlist, Inc.Search in Eureka ↗ |
| Plaintiff counsel | William Milliken | Attorney | Counsel for Netlist, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Irell & Manella LLP | Law Firm | Representing Netlist, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Sterne, Kessler, Goldstein & Fox PLLC | Law Firm | Representing Netlist, Inc.Search in Eureka ↗ |
| Defendant counsel | Eliot Damon Williams | Attorney | Counsel for Samsung Electronics Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Lori Ding | Attorney | Counsel for Samsung Electronics Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Michael Hawes | Attorney | Counsel for Samsung Electronics Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Theodore W. Chandler | Attorney | Counsel for Samsung Electronics Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Baker Botts LLP | Law Firm | Representing Samsung Electronics Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Appeals for the Federal CircuitSearch in Eureka ↗ |
Official order — verbatim text
The verdict — ‘ORDERED and ADJUDGED: PER CURIAM (LOURIE, PROST, and CUNNINGHAM, Circuit Judges). AFFIRMED’ — is a complete appellate disposition requiring no remand. The per curiam format means no individual judge authored a separate opinion, which typically signals that the applicable legal standards, including the substantial evidence standard applied to PTAB factual findings and de novo review of legal questions such as obviousness, yielded a clear outcome in favour of the lower tribunal’s cancellation decision. Netlist’s rights under US10860506B2 are conclusively extinguished at this appellate level.
US10860506B2 — Memory module with timing-controlled data buffering
US10860506B2, filed under application number US16/391151, claims inventions directed at memory modules incorporating timing-controlled data buffering — a core technique in high-density DIMM architectures including load-reduced and registered DIMMs used in server and enterprise environments. Precise timing control over buffered data paths is critical to signal integrity, latency management, and compliance with JEDEC memory standards. The patent’s cancellation removes protection over these specific claimed implementations.
For the memory module sector, US10860506B2 represented a potential royalty exposure point for manufacturers of buffered DIMM products, including Samsung and Micron — two of the world’s largest DRAM producers. Its cancellation reduces Netlist’s leverage in licensing negotiations with these parties, though Netlist’s broader patent estate targeting memory interface and buffer technology means competitors should continue monitoring the portfolio for related claims that survived or were not asserted in this proceeding.
Should you run an FTO analysis against US10860506B2?
US10860506B2 has been cancelled and the cancellation affirmed by the Federal Circuit — it is no longer an enforceable barrier for manufacturers, designers, or vendors of timing-controlled buffered memory modules. However, product teams working in buffered DIMM, load-reduced DIMM, or registered DIMM architectures should verify whether Netlist holds related continuation or family patents covering overlapping claim scope. A cancelled patent does not nullify its entire patent family.
PatSnap Eureka’s FTO Search Agent can map the full patent family around US10860506B2, identify surviving continuation or divisional applications, and surface any pending claims that could present future risk in the memory buffering space. For semiconductor IP counsel and R&D teams, running a family-level FTO — not just a single-patent check — is the appropriate risk-management step following this Federal Circuit affirmance.
Run a freedom-to-operate analysis on US10860506B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit memory patent invalidity appeal cases
Cases matching Federal Circuit appeals of PTAB unpatentability decisions involving memory module and semiconductor buffer interface patents, including other Netlist proceedings.
What this case signals for the memory module IP landscape
Federal Circuit affirmances of PTAB unpatentability decisions continue to reshape the competitive IP environment in semiconductor memory.
Per curiam affirmances signal high PTAB deference at the Federal Circuit
A per curiam disposition without a full written opinion typically indicates the panel viewed the PTAB’s unpatentability analysis as clearly correct. For memory IP holders, this reinforces that Federal Circuit appeals of adverse PTAB outcomes carry a high bar — particularly where prior art and obviousness grounds are well-developed on the record.
Multi-entity defendant coalitions are increasingly effective in PTAB challenges
Samsung and three Micron entities jointly defending suggests coordinated inter partes review strategy. When major semiconductor players pool resources in PTAB proceedings, they bring broader prior art searches and stronger expert testimony — a pattern that correlates with higher cancellation rates and affirmed outcomes at the Federal Circuit.
Netlist v Samsung — key questions answered
The Federal Circuit affirmed the unpatentability of US10860506B2 in a per curiam decision issued 9 December 2025 by Judges Lourie, Prost, and Cunningham. The underlying invalidity and cancellation determination was upheld, meaning Netlist’s patent covering timing-controlled data buffering in memory modules is cancelled and unenforceable.
A per curiam opinion is issued in the name of the court as a whole, without identifying an individual authoring judge. At the Federal Circuit, this format typically signals that the panel found the legal and factual questions sufficiently clear-cut to resolve without extended written analysis. It does not diminish the precedential or conclusive effect of the affirmance — the lower tribunal’s decision stands in full.
The sole patent at issue was US10860506B2, filed as US16/391151, covering a memory module with timing-controlled data buffering. This technology is relevant to buffered DIMM architectures used in enterprise and server memory systems. Samsung Electronics Co., Ltd. and three Micron Technology entities were the respondents defending against Netlist’s appeal.
Following a Federal Circuit affirmance, the losing party may petition the Supreme Court for a writ of certiorari. However, the Supreme Court grants certiorari in a very small fraction of petitions, and patent validity cases without significant circuit splits or constitutional questions face very low odds of review. As a practical matter, the cancellation of US10860506B2 is considered final for most commercial and litigation planning purposes.
The cancellation removes US10860506B2 as a licensing and enforcement tool against Samsung, Micron, and any other memory manufacturers. Netlist has pursued extensive patent litigation against major memory makers, and each cancelled patent reduces its negotiating leverage. IP professionals monitoring Netlist should assess whether related family members or continuation patents cover similar claim scope and remain active enforcement vehicles.
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