M4siz Limited v. Wayfair, Inc. — Dismissed With Prejudice After 603 Days
M4siz Limited filed a patent infringement suit against e-commerce giant Wayfair in the Western District of Texas, asserting US6526402B2 against Wayfair’s websites. After 603 days of litigation, M4siz voluntarily dismissed the case with prejudice under Rule 41(a)(1)(A)(i), permanently closing its claims and leaving each party to cover its own legal costs.
Patent NPE targets Wayfair’s website in W.D. Texas, then walks away
On 8 June 2022, M4siz Limited — a patent assertion entity represented by Ramey LLP and Whitestone Law — filed suit against Wayfair, Inc. in the Western District of Texas (Waco Division) before Chief Judge Alan D. Albright, a venue long favoured by patent plaintiffs. The asserted patent, US6526402B2, covers a data recommendation system, and M4siz alleged that Wayfair’s consumer-facing e-commerce websites infringed its claims. Wayfair retained McDermott Will & Emery LLP to mount its defence.
The case concluded on 1 February 2024 when M4siz filed a unilateral notice of voluntary dismissal with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(i). That procedural mechanism allows a plaintiff to dismiss its own case without court approval — but here M4siz expressly elected dismissal with prejudice, permanently extinguishing its right to reassert the same claims against Wayfair. The parties agreed each would bear its own costs and fees, meaning no monetary relief changed hands and no fee award was entered against either side.
At 603 days, the case ran longer than a typical pre-discovery settlement but stopped well short of trial, suggesting resolution may have been driven by claim-strength assessments, inter partes review risk, or a confidential commercial arrangement whose terms are not reflected in the public record. The with-prejudice designation is notable: it forecloses M4siz from refiling against Wayfair on US6526402B2, which is atypical of pure nuisance settlements where plaintiffs often preserve optionality via without-prejudice dismissals.
Filing to dismissal in 603 days
603 days — longer than many Rule 41 voluntary dismissals but well short of full trial
Dismissed with prejudice: what the Rule 41 filing means for both parties
Rule 41(a)(1)(A)(i) — plaintiff’s unilateral right to dismiss
Under FRCP 41(a)(1)(A)(i), a plaintiff may dismiss an action without a court order before the defendant serves either an answer or a motion for summary judgment. M4siz invoked this right here. Critically, M4siz added ‘with prejudice’ — a deliberate choice that converts what would be a default without-prejudice dismissal into a final adjudication on the merits, permanently barring re-litigation of these claims against Wayfair.
Voluntary — no court order requiredWith prejudice: M4siz’s claims against Wayfair are permanently extinguished
A dismissal with prejudice carries the same res judicata effect as a judgment on the merits. M4siz cannot refile suit against Wayfair asserting US6526402B2 in any U.S. federal court. This is a stronger concession than a typical NPE retreat, where plaintiffs often preserve the right to refile. The with-prejudice election may reflect a negotiated term, an IPR outcome, or a litigation cost-benefit assessment — but the public record does not disclose the precise motivation.
Permanent bar on re-litigationEach party bears its own costs — no fee award, no § 285 motion
The dismissal order specifies that each party bears its own costs and fees. Under 35 U.S.C. § 285, prevailing parties in exceptional patent cases may seek attorney fee awards, but no such motion was pursued here. The mutual cost-bearing arrangement is consistent with a negotiated resolution or an agreed exit where neither side wished to litigate fee entitlement — a common commercial compromise even where one party holds significant leverage.
No § 285 fee motion filedW.D. Texas (Albright) — still a favoured NPE forum at time of filing
Chief Judge Albright’s Waco Division was the single busiest patent docket in the U.S. at the time M4siz filed in 2022, attracting NPE plaintiffs with its fast scheduling and plaintiff-friendly reputation. The Supreme Court’s later scrutiny and internal W.D. Texas reassignment policies modestly shifted case flows. Filing before Albright would have signalled an intent to litigate aggressively — making the eventual with-prejudice dismissal a more notable strategic reversal.
High-volume NPE docketFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | M4siz Limited | Company | Patent assertion entity — holder of US6526402B2 (data recommendation system)Search in Eureka ↗ |
| Defendant | Wayfair, Inc. | Company | Wayfair, Inc. — publicly traded U.S. e-commerce retailer operating wayfair.com and related sitesSearch in Eureka ↗ |
| Plaintiff counsel | Joseph J. Zito | Attorney | Counsel for M4siz LimitedSearch in Eureka ↗ |
| Plaintiff counsel | William P. Ramey , III | Attorney | Counsel for M4siz LimitedSearch in Eureka ↗ |
| Defendant counsel | Alexander P. Ott | Attorney | Counsel for Wayfair, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Alan D Albright | Chief Judge | Texas Western District Court — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The dismissal notice is terse but legally precise: M4siz invoked Rule 41(a)(1)(A)(i) — the unilateral plaintiff mechanism — while voluntarily adding the with-prejudice designation and a mutual cost-bearing term. This phrasing confirms no settlement payment is disclosed, no court adjudication occurred on the merits, and yet Wayfair receives the maximum procedural protection available short of a judgment: permanent preclusion of these claims. The absence of any § 285 motion or fee reservation by Wayfair suggests the parties reached a clean, unconditional exit.
US6526402B2 — Data recommendation system patent
US6526402B2 (application number US09/732947) is a granted U.S. patent covering a data recommendation system — a technology domain central to e-commerce personalisation, product suggestion engines, and user-behaviour-driven content delivery. Patents in this space typically claim methods or systems for analysing user data inputs and returning contextually relevant recommendations. The application predates the modern era of large-scale algorithmic recommendation, giving it potentially broad claim language that can be read against contemporary website personalisation architectures.
Data recommendation patents occupy a contested space in e-commerce IP. Major retailers, marketplace platforms, and content delivery services all operate recommendation layers that could fall within broad claim interpretations of such patents. M4siz’s decision to target Wayfair — one of the largest pure-play e-commerce platforms in the U.S. — suggests confidence in claim scope, though the with-prejudice exit indicates that confidence may have eroded under litigation pressure. Any company operating a product recommendation, search ranking, or personalisation feature on a consumer-facing website should treat US6526402B2 as a reference point for FTO analysis.
Should your e-commerce platform run an FTO against US6526402B2?
Any company operating a website with algorithmic product recommendations, personalisation features, or user-behaviour-driven content surfacing should assess exposure to US6526402B2. The fact that M4siz targeted Wayfair’s consumer website specifically — rather than a back-end SaaS provider — suggests the asserted claims may read on front-end recommendation implementations. Mid-tier and enterprise e-commerce operators without Wayfair’s litigation resources are potentially higher-value, lower-resistance targets for future assertions from this or successor patent holders.
PatSnap Eureka’s FTO Search Agent can map the independent claims of US6526402B2 against your product architecture, surface prior art that could support an IPR petition, and flag related family members or continuation patents that may present parallel risk. Continuous claim monitoring through Eureka ensures your team is alerted if M4siz or an assignee pursues related patents or files new actions — allowing your legal and product teams to respond before litigation pressure builds.
Run a freedom-to-operate analysis on US6526402B2 to assess your product’s exposure
Run FTO in Eureka →Similar patent cases: NPE data recommendation suits in e-commerce
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What this case signals for e-commerce and data recommendation IP risk
A with-prejudice exit after 603 days carries distinct signals for NPE enforcement patterns and e-commerce IP exposure.
With-prejudice dismissals often signal underlying patent validity concerns
When a patent assertion entity voluntarily exits with prejudice rather than seeking a without-prejudice retreat, it typically suggests the plaintiff assessed its patent position as untenable — whether due to prior art exposure, IPR institution risk, or claim construction challenges. Companies facing similar assertions on US6526402B2 should note this outcome when evaluating defence strategy and settlement leverage.
Wayfair’s McDermott defence team achieved a permanent claim bar without trial
Securing a with-prejudice dismissal without a summary judgment ruling or trial is a strong litigation outcome for a defendant. It eliminates residual risk from the asserted patent entirely, at least as against Wayfair. Other e-commerce defendants facing comparable NPE assertions over recommendation or personalisation patents should consider aggressive early motion practice to create similar resolution pressure.
M4siz v Wayfair — key questions answered
M4siz Limited filed a patent infringement suit against Wayfair, Inc. in the Western District of Texas in June 2022, asserting US6526402B2 against Wayfair’s websites. On 1 February 2024, M4siz voluntarily dismissed the case with prejudice under FRCP 41(a)(1)(A)(i), permanently ending its claims against Wayfair. Each party agreed to bear its own costs and fees.
Dismissal with prejudice carries the same legal effect as a final judgment on the merits. M4siz is permanently barred from refiling suit against Wayfair asserting US6526402B2 in any U.S. federal court. The res judicata bar is absolute as between these two parties, though M4siz retains the ability to assert the patent against other defendants if the patent remains in force.
A with-prejudice election typically reflects either a negotiated exit condition demanded by the defendant, a plaintiff’s assessment that the patent cannot survive further scrutiny, or the resolution of an inter partes review threat. Unlike a without-prejudice dismissal — which preserves the right to refile — a with-prejudice dismissal is a meaningful concession. The public record in this case does not disclose the precise motivation.
US6526402B2 is a U.S. patent covering a data recommendation system, filed under application number US09/732947. M4siz alleged that Wayfair’s consumer-facing e-commerce websites infringed its claims — consistent with the patent’s potential applicability to product recommendation and personalisation features. The specific claims mapped to Wayfair’s implementation were not adjudicated due to the pre-trial dismissal.
No. The dismissal with prejudice binds only M4siz and Wayfair. Other e-commerce operators with recommendation or personalisation features remain potential targets if US6526402B2 is still in force and M4siz or a subsequent assignee chooses to assert it. Companies in this position should consider conducting an FTO analysis and monitoring the patent’s assignment and continuation status.
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