American Regent v. Meitheal: Selenious Acid ANDA Dispute Ends in 7-Day Consent Judgment
American Regent, Inc. filed suit against Meitheal Pharmaceuticals and Kindos Pharmaceuticals over ANDA No. 219472 — a generic selenious acid injection (600 mcg/10 mL) — asserting US12150957B2 and US11998565B2. The parties resolved the dispute within just 7 days via a consent judgment that enjoins Meitheal/Kindos from commercialising the generic product without authorisation.
A 7-Day ANDA Settlement That Locks In an Injunction for ARI
On 14 February 2025, American Regent, Inc. filed a patent infringement action in the New Jersey District Court against Meitheal Pharmaceuticals, Inc. and its manufacturing partner Kindos Pharmaceuticals Co., Ltd. The complaint centred on Meitheal’s Abbreviated New Drug Application No. 219472, which sought FDA approval for a generic version of ARI’s selenious acid injection — a parenteral selenium supplement dosed at 600 mcg per 10 mL. ARI asserted two patents: US12150957B2 and US11998565B2, both covering aspects of the selenious acid formulation.
The case closed just seven days later, on 21 February 2025, via a consent judgment and stipulated injunction. Under the terms, Meitheal and Kindos are enjoined from making, selling, importing, or distributing the ANDA product in the United States without ARI’s authorisation. All claims and counterclaims were dismissed without prejudice and without costs to any party, and the court retained jurisdiction to enforce the settlement agreement. The underlying commercial terms are contained in a confidential Settlement Agreement not disclosed in the public record.
A seven-day resolution is highly atypical for ANDA litigation, which typically runs for years under the Hatch-Waxman framework. The speed suggests the parties had pre-filing negotiations substantially advanced before the complaint was filed — a common but strategically significant approach where litigation is used to formalise and enforce an already-negotiated deal. The reservation of paragraph IV certification rights for Meitheal/Kindos suggests the settlement may contemplate a future licensed entry date, though the public record does not confirm this.
Filing to Consent Judgment in 7 days
7 days — exceptionally fast resolution, well below typical ANDA litigation timelines of 12–24 months
Consent judgment with injunction: what the resolution means for both parties
Consent judgment is a court-enforceable settlement — not a merits ruling
A consent judgment is a negotiated resolution entered as a binding court order, giving it the force of judicial enforcement. Unlike a voluntary dismissal, the injunction here is court-ordered, meaning violation by Meitheal/Kindos can be pursued as contempt of court. No finding of infringement or validity was made on the merits — the outcome reflects commercial agreement, not adjudication.
Stipulated injunction enteredARI secures injunction without litigation risk to patent validity
By resolving via consent judgment, ARI obtained an enforceable injunction blocking Meitheal/Kindos from commercialising the generic without authorisation — and did so without exposing US12150957B2 or US11998565B2 to invalidity challenge at trial or in IPR proceedings arising from this dispute. ARI’s commercial exclusivity over its selenious acid product is preserved, at least until the Settlement Agreement permits entry.
Exclusivity preservedMeitheal retains ANDA and paragraph IV rights — suggesting future entry
Critically, the consent judgment expressly preserves Meitheal/Kindos’s right to maintain or refile paragraph IV certifications against the Licensed ARI Patents. This is a strong signal that the Settlement Agreement likely includes an agreed future launch date. The ANDA itself remains intact, and FDA approval is not blocked. Meitheal’s strategic position is deferred entry rather than permanent exclusion.
Para. IV rights preservedHatch-Waxman ‘filing-as-formality’ pattern raises monitoring flags for competitors
The 7-day resolution is consistent with a litigation-formalised licensing strategy, where the lawsuit is filed to trigger the 30-month stay and then resolved on agreed terms. For other generic manufacturers monitoring the selenious acid space, this pattern suggests ARI may be managing market entry through licensing rather than hard exclusion. Third-party ANDA filers should monitor the Settlement Agreement’s authorised entry date if and when it becomes discoverable.
Likely licensed-entry dealFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | American Regent, Inc. | Company | Pharmaceutical company — holder of US12150957B2 and US11998565B2 covering selenious acid injectionSearch in Eureka ↗ |
| Defendant | Meitheal Pharmaceuticals, Inc. | Company | Generic drug manufacturer; filed ANDA No. 219472 for generic selenious acid 600 mcg/10 mLSearch in Eureka ↗ |
| Plaintiff counsel | Charles H. Chevalier | Attorney | Counsel for American Regent, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Gibbons PC | Law Firm | Representing American Regent, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | New Jersey District CourtSearch in Eureka ↗ |
Official order — verbatim text
The consent judgment is notable for what it does and does not establish. It creates a judicially enforceable injunction — meaning any future breach by Meitheal/Kindos is actionable as contempt — but makes no finding on infringement or patent validity. The explicit carve-out preserving paragraph IV certification rights (Clause 7) and the FDA approval savings clause (Clause 8) are standard Hatch-Waxman settlement architecture, consistent with a negotiated future authorised entry date embedded in the undisclosed Settlement Agreement.
US12150957B2 & US11998565B2 — Selenious Acid Injectable Formulations
US12150957B2 (application US18/672876) and US11998565B2 (application US18/124391) both protect aspects of ARI’s selenious acid injectable product — a sterile parenteral formulation delivering 60 mcg selenium per mL (600 mcg per 10 mL vial). The relatively recent application numbers and granted patent numbers suggest these are newer patents in ARI’s portfolio, likely reflecting reformulation or stability innovations rather than foundational selenium chemistry, though the full claim scope requires independent review.
Selenious acid injections are critical components of parenteral nutrition protocols, used in patients who cannot receive enteral nutrition. ARI’s commercial product occupies a specialised niche with limited generic competition. By asserting two patents covering the formulation, ARI creates a layered exclusivity position that generic entrants must navigate on two fronts — increasing the cost and risk of ANDA-based market entry. The consent judgment reinforces the commercial durability of this patent stack.
Should you run an FTO against US12150957B2 and US11998565B2?
Any company developing a parenteral selenium formulation — whether an ANDA filer, a 505(b)(2) applicant, or an innovator developing a next-generation selenious acid product — should run a freedom-to-operate analysis against both US12150957B2 and US11998565B2. The consent judgment in this case demonstrates that ARI is actively enforcing these patents and is willing to move quickly. A pre-ANDA FTO can identify design-around opportunities or invalidity arguments before litigation exposure arises.
PatSnap Eureka’s FTO Search Agent can map the claim scope of both patents against your formulation parameters, identify prior art relevant to validity challenges, and flag related continuation applications that may extend ARI’s exclusivity window. Given the 7-day litigation cycle here, having an FTO completed before ANDA submission — not after — is the operationally sound approach for any injectables manufacturer in the parenteral nutrition space.
Run a freedom-to-operate analysis on US12150957B2 to assess your product’s exposure
Run FTO in Eureka →Similar ANDA Patent Infringement Cases — Parenteral Formulations
Explore comparable Hatch-Waxman ANDA infringement cases involving parenteral and injectable formulation patents litigated in New Jersey District Court.
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 Generic version of ARI’s Selenious Acid product (eq. 600 mcg Selenium/10 mL (eq. 60 mcg Selenium/mL))-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.
DecidedAmerican Regent, Inc.’s broader IP enforcement history
American Regent, Inc.’s full litigation history covering prior enforcement, licensing activity, and inter partes review proceedings.
Portfolio viewWhat this case signals for the parenteral nutrition IP landscape
A 7-day ANDA consent judgment with an injunction and preserved paragraph IV rights is a textbook strategic settlement — here is what it means.
Speed of resolution signals pre-litigation deal structure in ANDA cases
When an ANDA infringement case closes within one week of filing, it typically indicates the parties had already negotiated core commercial terms before the complaint was filed. Patent counsel monitoring the selenious acid or broader parenteral nutrition space should treat this as a licensing event, not a litigation win — the injunction formalises an agreement rather than adjudicating infringement.
ARI’s two-patent stack creates a compounding exclusivity barrier for future ANDA filers
With both US12150957B2 and US11998565B2 now backed by a court-ordered injunction in a precedent-setting consent judgment, future generic challengers face a higher practical barrier. Any new ANDA filer will need to design around or challenge both patents — and ARI can point to this consent judgment as evidence of commercial validity of its patent position.
The preserved paragraph IV clause likely encodes a confidential launch window
Consent judgments that expressly preserve paragraph IV recertification rights almost always reflect a negotiated authorised generic entry date embedded in the confidential Settlement Agreement. IP teams tracking competitive entry timelines for parenteral selenium products should file FOIA requests and monitor FDA Orange Book patent expiry listings against application No. 219472 for signals of the agreed launch date.
Kindos Pharmaceuticals as manufacturing co-defendant suggests supply-chain IP exposure
The inclusion of Chinese manufacturer Kindos Pharmaceuticals as a named defendant — and as a party bound by the injunction — signals ARI’s intent to enforce at the supply chain level, not just at the US distributor. Generic manufacturers sourcing from overseas CDMOs in the injectables space should audit supplier patent exposure before ANDA submission, particularly where the innovator holds both formulation and manufacturing-method patents.
American v Meitheal — key questions answered
The case was resolved by a consent judgment entered on 21 February 2025 — just 7 days after filing. Meitheal Pharmaceuticals and Kindos Pharmaceuticals were enjoined from making, selling, or importing their ANDA No. 219472 selenious acid product in the US without ARI’s authorisation. All claims were dismissed without prejudice and without costs.
American Regent asserted US12150957B2 (application US18/672876) and US11998565B2 (application US18/124391). Both patents cover aspects of ARI’s selenious acid injectable formulation delivering 600 mcg selenium per 10 mL vial. The consent judgment designates both as ‘Licensed ARI Patents’ subject to the injunction.
Clause 7 of the consent judgment expressly allows Meitheal/Kindos to maintain or refile paragraph IV certifications against ARI’s patents. This is a standard Hatch-Waxman settlement feature that typically signals a confidential agreed-upon authorised entry date in the undisclosed Settlement Agreement — meaning Meitheal likely retains rights to launch the generic at a future negotiated date.
A 7-day resolution strongly suggests the parties had substantially completed commercial negotiations before the complaint was filed. In Hatch-Waxman litigation, it is common for innovators and generic manufacturers to negotiate settlement terms in parallel with — or even prior to — filing suit, using the complaint to trigger the 30-month stay and formalise agreed terms as a court-enforceable consent judgment.
Yes. The consent judgment explicitly defines Meitheal/Kindos collectively and binds both Meitheal Pharmaceuticals, Inc. and Kindos Pharmaceuticals Co., Ltd — the Chinese manufacturing partner — along with their affiliates, successors, and assigns. This means the injunction applies at the supply chain level, prohibiting manufacturing by Kindos for US sale without ARI’s authorisation.
Monitor parenteral nutrition patent enforcement before your next ANDA filing
ARI’s rapid enforcement of US12150957B2 and US11998565B2 signals an active litigation posture in the selenious acid space. Use PatSnap Eureka to run FTO searches, track Orange Book listings, and monitor new ANDA challenges before they become injunctions.
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