IntraBio v. Tesseract Medical Research: Consent Judgment & Injunction in 113 Days
IntraBio Inc. asserted four patents covering its AQNEURSA® N-acetyl-L-leucine therapy against Tesseract Medical Research’s competing NALL product. The case resolved in just 113 days via a consent judgment in which Tesseract admitted patent validity, accepted an injunction across six states, and the claims were dismissed without prejudice.
Four NALL Patents, One Consent Judgment, and a Six-State Injunction
Filed on 10 April 2025 in the District of Delaware before Judge Jennifer L. Hall, IntraBio Inc. — the holder of FDA-approved AQNEURSA® (N-acetyl-L-leucine, or NALL) for Niemann-Pick disease type C — brought an infringement action against Tesseract Medical Research, LLC and affiliated entities over four U.S. patents: US11400067B2, US11471434B2, US11660279B2, and US12144792B2. The patents collectively cover NALL compositions, formulations, and methods of use. Tesseract was accused of making, marketing, selling, or distributing a competing NALL product in violation of those rights.
The litigation concluded on 1 August 2025 — just 113 days after filing — through a consent judgment and injunction stipulated by both parties. Critically, Tesseract admitted that the claims of all four asserted patents are valid and enforceable, a concession that is unusual and carries significant weight in any future enforcement. Tesseract and its affiliates, successors, and assigns are now permanently enjoined from commercialising the Tesseract NALL product in California, Colorado, Florida, Tennessee, South Carolina, and Connecticut, unless specifically authorised by IntraBio. All claims and counterclaims were dismissed without prejudice, with no costs awarded to either side.
A resolution inside four months, culminating in a validity admission and multi-state injunction, suggests IntraBio held a strong enforcement position from the outset — possibly supported by the commercial weight of an FDA-approved product and a freshly issued fourth patent (US12144792B2). The absence of a damages award and the without-prejudice dismissal leave open the possibility of future proceedings if Tesseract’s conduct expands beyond the injunction’s current geographic scope or product definition. The financial consideration exchanged between the parties — described only as ‘good cause and valuable consideration’ — is not disclosed in the public record.
Filing to Consent Judgment in 113 days
113 days — well below the median district court patent case duration of ~2.5 years
Consent Judgment entered: what Tesseract’s admission and injunction mean
Consent judgment: a negotiated court order with teeth
A consent judgment is a binding court order entered by agreement of both parties. Unlike a settlement agreement that may remain private, a consent judgment is a public judicial decree enforceable by the court. Here, the Delaware District Court retains express jurisdiction to enforce or supervise compliance. This means IntraBio can return to court for contempt or enforcement proceedings without filing a new lawsuit if Tesseract violates the injunction.
Judicially enforceable orderIntraBio secures validity admission across all four patents
Tesseract expressly admitted that the claims of all four asserted patents are valid and enforceable — a concession that strengthens IntraBio’s position against any future challenger. The six-state injunction bars Tesseract and its affiliates from commercialising the competing NALL product in key markets without IntraBio’s authorisation. Claims were dismissed without prejudice, preserving IntraBio’s right to seek damages for past conduct should commercial terms later break down.
Validity confirmed by admissionTesseract accepts injunction and concedes patent validity
Tesseract’s admission of validity forecloses the most common defensive weapon in patent litigation. The six-state injunction restricts Tesseract’s commercial operations in California, Colorado, Florida, Tennessee, South Carolina, and Connecticut. The without-prejudice dismissal means IntraBio retains the ability to reassert claims. Tesseract may still operate outside those six states unless the parties’ agreement — terms of which are not public — imposes broader restrictions.
Injunction in six statesNALL market: IntraBio’s IP position materially strengthened
With a public validity admission and an active injunction on record, any future NALL competitor faces a higher bar. The admission cannot be used directly against third parties in litigation, but it signals that Tesseract — represented by counsel and presumably after due diligence — saw no viable invalidity defence. Companies developing or marketing NALL products for neurological indications should treat IntraBio’s four-patent portfolio as actively and aggressively enforced IP requiring careful FTO analysis.
Heightened competitor riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | IntraBio Inc. | Company | Rare-disease therapeutics company — holder of US11400067B2, US11471434B2, US11660279B2, and US12144792B2Search in Eureka ↗ |
| Defendant | Tesseract Medical Research, LLC | Company | Nutraceutical/supplement developer commercialising a competing N-acetyl-L-leucine (NALL) productSearch in Eureka ↗ |
| Plaintiff counsel | Alfonso G. Chan | Attorney | Counsel for IntraBio Inc.Search in Eureka ↗ |
| Plaintiff counsel | Dara M. Kurlancheek | Attorney | Counsel for IntraBio Inc.Search in Eureka ↗ |
| Plaintiff counsel | Kelly E. Farnan | Attorney | Counsel for IntraBio Inc.Search in Eureka ↗ |
| Plaintiff counsel | Paul A. Ainsworth | Attorney | Counsel for IntraBio Inc.Search in Eureka ↗ |
| Plaintiff counsel | Stephen E. Baskin | Attorney | Counsel for IntraBio Inc.Search in Eureka ↗ |
| Plaintiff law firm | Richards Layton & Finger PA | Law Firm | Representing IntraBio Inc.Search in Eureka ↗ |
| Defendant counsel | Stamatios Stamoulis | Attorney | Counsel for Tesseract Medical Research, LLCSearch in Eureka ↗ |
| Defendant law firm | Stamoulis & Weinblatt LLC | Law Firm | Representing Tesseract Medical Research, LLCSearch in Eureka ↗ |
| Presiding judge | Judge Jennifer L. Hall | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The consent judgment is notable for three features beyond a standard settlement: (1) Tesseract’s express admission that all four asserted patent claims are valid and enforceable — a concession that survives the litigation and informs future enforcement; (2) a judicially entered injunction binding Tesseract’s affiliates, successors, and assigns across six U.S. states; and (3) the court’s retained jurisdiction for enforcement. The without-prejudice dismissal of all claims preserves IntraBio’s ability to seek damages in a future proceeding, making this outcome functionally asymmetric — IntraBio retains offensive optionality while Tesseract absorbs an immediate operational constraint.
US11400067B2, US11471434B2, US11660279B2, US12144792B2 — NALL Therapeutic Patents
The four asserted patents — US11400067B2, US11471434B2, US11660279B2, and US12144792B2 — form a coordinated portfolio covering N-acetyl-L-leucine (NALL) compositions, formulations, and therapeutic methods for neurological indications including Niemann-Pick disease type C. Filed across U.S. application numbers US16/324301, US16/622785, US16/968919, and US16/324353, the patents represent layered protection across product, formulation, and method-of-use dimensions. US12144792B2 is the most recently issued, suggesting IntraBio has been actively prosecuting continuation or related applications to maintain and extend coverage.
NALL’s emergence as a therapy for rare neurological diseases — culminating in FDA approval of AQNEURSA® — makes this patent estate commercially high-stakes. The breadth of four independently asserted patents, spanning multiple application families, creates a portfolio that is difficult to design around without touching at least one claim set. Any company developing or marketing a NALL-based product for neurological indications — whether as a pharmaceutical or supplement — should treat this portfolio as actively enforced IP. The consent judgment, including Tesseract’s validity admission, materially strengthens IntraBio’s enforcement position in any future dispute.
Should you run an FTO against IntraBio’s NALL patent portfolio?
Any company developing, manufacturing, or distributing an N-acetyl-L-leucine product — whether as a prescription therapy, over-the-counter supplement, or nutraceutical — should conduct a freedom-to-operate analysis against IntraBio’s four-patent portfolio before entering U.S. markets. The consent judgment confirms these patents are asserted aggressively, and Tesseract’s validity admission eliminates the comfort of assuming the claims are vulnerable to early challenge. Product teams planning NALL launches in any U.S. state should treat this as a blocking IP risk.
PatSnap Eureka’s FTO Search Agent can map your NALL product’s technical features against the claim sets of US11400067B2, US11471434B2, US11660279B2, and US12144792B2 simultaneously. Eureka identifies claim-by-claim overlap, surfaces prior art that was not considered during prosecution, and flags continuation applications that may extend IntraBio’s coverage. R&D teams can use Eureka to identify design-around opportunities early — before product launch creates infringement exposure or litigation risk.
Run a freedom-to-operate analysis on US11471434B2 to assess your product’s exposure
Run FTO in Eureka →Similar NALL and rare-disease therapeutic patent cases in Delaware
Cases involving NALL compositions, rare neurological disease therapeutics, and consent judgment outcomes in the Delaware District Court — explore comparable enforcement patterns.
Related patent case — similar technology
Comparable case in the same technology domain. Patent holder and defendant reached resolution after proceedings.
SettledRelated infringement action — same court
Comparable IntraBio’s AQNEURSA® (N-acetyl-L-leucine or “NALL”) for the treatment of NPC-adjacent infringement action. Patent enforcement dynamics analysed in depth.
Active · District CourtRelated invalidity challenge — appellate outcome
Combined invalidity and infringement action in the same technology space. Decided after substantive proceedings.
DecidedIntraBio Inc.’s broader IP enforcement history
IntraBio Inc.’s full litigation history covering prior enforcement, licensing activity, and inter partes review proceedings.
Portfolio viewWhat this case signals for the NALL therapeutics IP landscape
A four-month enforcement action ending in a validity admission sets a clear precedent for IntraBio’s willingness and ability to protect its NALL patent estate.
Speed of resolution signals IntraBio’s strong opening position
A 113-day turnaround from filing to consent judgment — with no motions to dismiss, no IPR filings, and no validity fight — suggests Tesseract’s counsel assessed the four asserted patents as difficult to challenge. Companies holding competing NALL formulations or methods of use should not assume they can outlast IntraBio’s enforcement strategy in litigation.
Six-state injunction scope leaves geographic gaps worth monitoring
The injunction covers California, Colorado, Florida, Tennessee, South Carolina, and Connecticut — but is silent on other U.S. markets. Whether the underlying commercial terms impose broader restrictions is unknown from the public record. Competitors and counsel should monitor whether Tesseract resumes sales in uncovered states, which could trigger further enforcement action or a new filing.
Validity admission: litigation risk multiplier for all future NALL defendants
An admitted validity record — even from a single defendant — adds narrative weight to IntraBio’s enforcement story in subsequent cases. Future defendants cannot rely on a prior art record that defeated IntraBio before. Combined with the freshly issued US12144792B2, the portfolio presents a compounding enforcement risk across the NALL therapeutic and supplement space.
Without-prejudice dismissal preserves IntraBio’s damages optionality
The without-prejudice structure means IntraBio could, in theory, revive damages claims for past conduct if Tesseract breaches the consent judgment or if commercial terms unwind. IP counsel advising parties in similar consent judgment negotiations should scrutinise whether financial consideration in the undisclosed settlement fully resolves all past damages exposure — or leaves a contingent liability on Tesseract’s books.
IntraBio v Tesseract — key questions answered
Tesseract admitted that the claims of all four asserted patents — US11400067B2, US11471434B2, US11660279B2, and US12144792B2 — are valid and enforceable. This admission is formally part of the court-entered consent judgment and is part of the public record in Case No. 1:25-cv-00446 (D. Del.).
The consent judgment enjoins Tesseract, its affiliates, successors, and assigns from making, marketing, selling, offering to sell, exporting, or distributing the Tesseract NALL product in California, Colorado, Florida, Tennessee, South Carolina, and Connecticut, unless specifically authorised by IntraBio. The injunction does not expressly address other U.S. states on the face of the public judgment.
No monetary damages are referenced in the public consent judgment. The order states that all claims, counterclaims, and affirmative defenses are dismissed without prejudice and without costs, disbursements, or attorneys’ fees to any party. The parties’ agreement references ‘good cause and valuable consideration,’ but the financial terms are not disclosed in the public record.
A without-prejudice dismissal means IntraBio retains the legal right to reassert its infringement and damages claims in a future proceeding if circumstances warrant — for example, if Tesseract violates the injunction or if the underlying commercial arrangement breaks down. It does not constitute a final adjudication on the merits of the infringement claims.
IntraBio asserted US11400067B2 (‘067), US11471434B2 (‘434), US11660279B2 (‘279), and US12144792B2 (‘792). All four patents relate to N-acetyl-L-leucine (NALL) compositions, formulations, and methods of treatment for neurological disorders, and all are connected to IntraBio’s FDA-approved AQNEURSA® product.
Monitor IntraBio’s NALL patent estate and enforcement activity
IntraBio’s four-patent NALL portfolio is actively enforced, with a consent judgment on record. Use PatSnap Eureka to track continuation filings, monitor new NALL patent applications, and run FTO analysis before launching any N-acetyl-L-leucine product.
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