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Melinta v. Nexus Pharmaceuticals: Minocycline Injection Patent Win | PatSnap
Explore in Eureka
Case ID1:21-cv-02636
FiledMay 2021
ClosedNov 2024
Patent Litigation

Melinta v. Nexus: Court Awards Permanent Injunction Over Minocycline Injection Patents

Melinta Therapeutics and affiliates sued Nexus Pharmaceuticals over ANDA No. 214934 seeking generic approval for minocycline for injection, asserting US9084802 and US9278105. After 1,281 days of litigation, Judge Kness found Nexus liable for induced and contributory infringement and permanently blocked FDA approval of the ANDA product until both patents expire.

Resolution time
1281days
1,281-day case duration — roughly 3.5 years from filing to judgment, above median for ANDA patent cases in N.D. Illinois
Patents asserted
2
US9084802 and US9278105 — Minocin® (minocycline) for injection, intravenous antibiotic formulation patents
Outcome
Judgment on the merits for Plaintiff
Judgment on the merits for Plaintiff; permanent injunction granted; ANDA blocked until patent expiry
Cost ruling
Injunction
Nexus permanently enjoined from manufacturing, selling, or importing its ANDA product until both patents expire
Published by PatSnap Insights Team · Verified by PatSnap Eureka Data
Case overview

Hatch-Waxman Showdown: Melinta Locks Out Generic Minocycline Competitor

On May 14, 2021, Melinta Therapeutics, LLC, Melinta Subsidiary Corp., and Rempex Pharmaceuticals, Inc. filed suit in the Northern District of Illinois against Nexus Pharmaceuticals, Inc., asserting that Nexus’s submission of ANDA No. 214934 to the FDA — seeking approval of a generic version of Minocin® (minocycline) for injection — infringed claims of two patents: US9084802B2 and US9278105B2. The patents cover formulation and method-of-use aspects of the intravenous minocycline antibiotic product.

On November 15, 2024, Judge John F. Kness issued judgment on the merits for the plaintiffs. The court found Nexus liable for direct infringement via ANDA filing under 35 U.S.C. § 271(e)(2)(A), as well as induced and contributory infringement under §§ 271(a)–(c). Nexus’s invalidity defenses — covering obviousness, indefiniteness, lack of enablement, and lack of written description — all failed against the clear and convincing evidence standard. A permanent injunction now blocks any commercial activity involving the ANDA product until expiry of both patents, including any term extensions.

The 1,281-day duration reflects the complexity typical of multi-patent Hatch-Waxman trials involving both infringement and invalidity contentions litigated to a full merits judgment — rather than settled or voluntarily dismissed, as many ANDA cases are. The breadth of Nexus’s invalidity theories, all unsuccessful, suggests plaintiffs’ patents are robustly drafted. The public record does not disclose damages quantification beyond the injunctive award, nor the remaining patent term extensions or Orange Book listing status that will govern the effective exclusivity period.

Case at a glance
Case no.1:21-cv-02636
CourtIllinois Northern
JudgeJohn F. Kness
FiledMay 14, 2021
ClosedNovember 15, 2024
Duration1281 days
OutcomeJudgment on the merits for Plaintiff
Verdict causeDeclaratory Judgement
BasisJudgment on the merits for Plaintiff
Prior Art Intelligence
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Case data sourced from PACER / Illinois Northern District Court via PatSnap Eureka Litigation Intelligence Explore similar cases ↗
Case timeline

Filing to Judgment on the merits for Plaintiff in 1281 days

1,281-day case duration — roughly 3.5 years from filing to judgment, above median for ANDA patent cases in N.D. Illinois

Case timeline: Complaint filed MAY 14 2021, FEB–MAR — 1281 days total Horizontal timeline showing the three key events in Melinta Therapeutics, LLC v Nexus Pharmaceuticals, Inc. from filing to resolution. Source: PACER, Illinois Northern District Court. MAY 14 2021 Complaint filed Pre-trial proceedings NOV 15 2024 Judgment on the merits for Plaintiff 1281 DAYS TOTAL
Court ruling

Judgment for Melinta: what the permanent injunction means for both parties

Legal mechanism

Hatch-Waxman infringement: why ANDA filing itself triggers liability

Under 35 U.S.C. § 271(e)(2)(A), submitting an ANDA with a Paragraph IV certification is itself an act of infringement — even before a single generic pill is sold. The court also found induced and contributory infringement under §§ 271(a)–(c), meaning future commercial launch would compound liability. All four of Nexus’s invalidity defenses failed the clear and convincing evidence standard, leaving no viable path to market.

Statutory infringement proven
Patent holder outcome

Melinta secures market exclusivity until both patents expire

The permanent injunction bars Nexus from manufacturing, selling, offering for sale, or importing its ANDA product in the United States until expiry of US9084802 and US9278105, including any term extensions. Critically, FDA approval of the ANDA product is locked to a date no earlier than patent expiry. This outcome preserves Melinta’s branded Minocin® franchise and signals to other potential ANDA filers that these patents will be aggressively defended.

Injunction + exclusivity preserved
Challenger outcome

Nexus’s generic launch blocked; four invalidity theories rejected

Nexus failed to invalidate any of the asserted claims on obviousness, indefiniteness, lack of enablement, or lack of written description grounds — all held to the heightened clear and convincing evidence standard. The ANDA product cannot enter the market without triggering injunction contempt. Nexus retains the right to appeal, but the breadth of the merits loss and the range of failed invalidity theories suggests limited appellate upside without new prior art or claim-construction arguments.

All invalidity defenses failed
Commercial implications

Validated IV antibiotic patents raise the bar for generic entry

A full merits win — covering both infringement and validity across two patents and multiple claim types — signals that courts will scrutinize generic ANDA strategies for IV antibiotic formulations. Competitors monitoring the minocycline space should reassess Paragraph IV filing strategies. The ruling also suggests that Rempex/Melinta’s formulation patents for injectable antibiotics are durable assets, potentially attractive in licensing, M&A, or exclusivity-extension contexts. Any new entrant should run a comprehensive FTO analysis before filing.

Exclusivity barrier strengthened
Legal analysis based on PACER docket records for case 1:21-cv-02636 and PatSnap Eureka litigation intelligence Search PatSnap Eureka ↗
Parties and representation

Full party and counsel information

RoleNameTypeDetail
PlaintiffMelinta Therapeutics, LLCCompanySpecialty pharmaceutical company — holder of US9084802 and US9278105 covering Minocin® (minocycline) for injectionSearch in Eureka ↗
Co-PlaintiffMelinta Subsidiary, Corp.CompanySearch in Eureka ↗
Co-PlaintiffRempex Pharmaceuticals, Inc.CompanySearch in Eureka ↗
DefendantNexus Pharmaceuticals, Inc.CompanyGeneric pharmaceutical company seeking FDA approval via ANDA No. 214934 for minocycline for injectionSearch in Eureka ↗
Plaintiff counselBrian Neil AndersonAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselDamien Noel DombrowskiAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselDominick A. CondeAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselErin J.D. AustinAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselGary Edward HoodAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselHa Kung WongAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselJerrit YangAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselMark Thomas DemingAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff counselMonica ChouAttorneyCounsel for Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff law firmPolsinelli PCLaw FirmRepresenting Melinta Therapeutics, LLCSearch in Eureka ↗
Plaintiff law firmVenable LLPLaw FirmRepresenting Melinta Therapeutics, LLCSearch in Eureka ↗
Defendant counselHelen H JiAttorneyCounsel for Nexus Pharmaceuticals, Inc.Search in Eureka ↗
Defendant counselImron T. AlyAttorneyCounsel for Nexus Pharmaceuticals, Inc.Search in Eureka ↗
Defendant counselJoel M WallaceAttorneyCounsel for Nexus Pharmaceuticals, Inc.Search in Eureka ↗
Defendant counselKevin Michael NelsonAttorneyCounsel for Nexus Pharmaceuticals, Inc.Search in Eureka ↗
Defendant counselMatthew Thomas WilkersonAttorneyCounsel for Nexus Pharmaceuticals, Inc.Search in Eureka ↗
Defendant law firmArentFox Schiff LLPLaw FirmRepresenting Nexus Pharmaceuticals, Inc.Search in Eureka ↗
Defendant law firmSchiff Hardin LLPLaw FirmRepresenting Nexus Pharmaceuticals, Inc.Search in Eureka ↗
Presiding judgeJudge John F. KnessJudgeIllinois Northern District CourtSearch in Eureka ↗
Official verdict

Official order — verbatim text

“Defendant has been found liable of induced and contributory infringement of Claims 1, 7, and 18 of Plaintiffs’ Patent No. 9,084,802 and Claim 27 of Plaintiffs’ Patent No. 9,278,105. Plaintiffs have proved direct, induced, and contributory infringement by a preponderance of the evidence. Defendant has failed to prove invalidity for obviousness, indefiniteness, lack of enablement, or lack of written description by clear and convincing evidence. For these reasons, the Court finds that permanent injunctive relief enjoining Defendant from manufacturing, using, offering for sale, or selling its ANDA product until the expiration of Plaintiffs’ patents is appropriate. 35 U.S.C. §§ 271(a)–(c), (e). 1. Defendant’s submission of the ANDA No. 214934 infringed the ’802 Patent and the ’105 Patent pursuant to 35 U.S.C. § 271(e)(2)(A); 2. The commercial manufacture, use, offer for sale, and / or sale of the ANDA product within the United States, and / or the importation of the ANDA Case: 1:21-cv-02636 Document #: 277 Filed: 11/15/24 Page 3 of 4 PageID #:7743 2 product into the United States, will infringe on the ’802 Patent and the ’105 Patent pursuant to 35 U.S.C. §§ 271(a)–(c). 3. Defendant and its affiliates, subsidiaries, officers, agents, attorneys, employees, and those acting in privity or concert with them are permanently enjoined from the manufacture, use, offer for sale, or sale within the United States, or importation into the United States, of Defendant’s ANDA product until after the expiration of Plaintiffs’ ’802 Patent and ’105 Patent, including any extensions and / or additional periods of exclusivity to which Plaintiffs are or become entitled; 4. The effective date of FDA approval of the ANDA product is a date that is no earlier than the expiration of the ’802 Patent and the ’105 Patent, including any extensions and / or additional periods of exclusivity to which Plaintiffs are or become entitled; 5. Claims 1, 7, and 18 of the ’802 Patent are valid and enforceable; 6. Claim 27 of the ’105 Patent is valid and enforceable; and 7. Plaintiffs are awarded money damages or any other appropriate relief if Defendant makes, uses, sells, or offers to sell its ANDA product within the United States, or imports its ANDA product into the United States, prior to the expiration of the ’802 Patent and the ’105 Patent, including any extensions and / or additional periods of exclusivity to which Plaintiffs are or become entitled.”
Source: PACER Docket, Case 1:21-cv-02636, Illinois Northern District Court

The court’s verdict is unusually comprehensive for a Hatch-Waxman district court ruling: it affirmatively disposes of both infringement (direct, induced, and contributory) and validity (four separate grounds) in a single order. The preponderance standard for infringement and the clear and convincing standard for invalidity both resolved in plaintiffs’ favor, leaving Nexus with no residual legal foothold. The permanent injunction extending to ANDA product commercialization until patent expiry — including extensions — reflects the full scope of equitable relief available under 35 U.S.C. § 271(e).

PACER case 1:21-cv-02636 · Public docket record Explore in Eureka ↗
Patent at issue

US9084802 & US9278105 — Minocycline for Injection Formulation Patents

Publication No.US9084802B2
Application No.US14/204881
Patent details
ProductIntravenous minocycline for injection formulation and composition
Cited in actionMay 14, 2021

Publication No.US9278105B2
Application No.US13/654018
Patent details
ProductMinocycline injectable formulation methods of use and preparation
Cited in actionMay 14, 2021

US9084802B2 (application no. US14/204881) and US9278105B2 (application no. US13/654018) cover formulation and method-of-use aspects of minocycline for intravenous injection — the active ingredient in Melinta’s branded Minocin® product. Minocycline is a broad-spectrum tetracycline-class antibiotic used to treat serious bacterial infections including hospital-acquired pneumonia and skin infections. The patents protect specific formulation parameters and administration methods that are critical to the commercial product’s stability and clinical performance.

These patents sit at the intersection of drug formulation chemistry and clinical antibiotic therapy, a space where incremental formulation innovation can sustain significant commercial exclusivity. The court’s validation of claims covering induced and contributory infringement means the patents extend beyond the product itself to methods of use — broadening their scope against generic challengers. For competitors in the injectable antibiotic sector, these assets represent a meaningful barrier to entry in the IV minocycline market segment, and their confirmed validity enhances their value in licensing negotiations or portfolio transactions.

Patent data sourced from USPTO via PatSnap Eureka patent database Search patent records in Eureka ↗
Freedom to operate

Should you run an FTO against US9084802 and US9278105?

Any company developing or commercialising an injectable minocycline product — or formulating IV tetracycline-class antibiotics with similar delivery parameters — should treat this judgment as a mandatory FTO trigger. The permanent injunction covers not only the Nexus ANDA product but any product that would infringe the asserted claims, including future formulation variants. R&D teams exploring generic or biosimilar IV antibiotic pipelines should assess claim scope before investing in ANDA development.

PatSnap Eureka’s FTO Search Agent enables IP and R&D teams to map claim scope for US9084802 and US9278105 against your product formulation parameters, identify design-around opportunities, and monitor for new continuation or divisional filings in Melinta’s injectable antibiotic portfolio. Automated claim charting and real-time prosecution monitoring reduce the manual burden on in-house counsel while surfacing early signals of enforcement risk.

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Related litigation

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Strategic implications

What this case signals for the IV antibiotic and ANDA IP landscape

A rare full-merits Hatch-Waxman win sends a strong deterrent signal to generic pharmaceutical developers eyeing injectable antibiotic formulation patents.

Full merits judgment is a powerful deterrent for future ANDA filers

Unlike settlements or voluntary dismissals, a judgment on the merits for the plaintiff publicly validates the asserted patents. Nexus’s loss on all four invalidity theories — at the clear and convincing evidence standard — significantly raises the litigation risk calculus for any competitor contemplating a Paragraph IV certification against US9084802 or US9278105.

IV antibiotic formulation patents are defensible: what generic developers must reckon with

The court’s rejection of obviousness, indefiniteness, enablement, and written description challenges in a single ruling is uncommon and signals robust claim drafting. Generic developers in the IV antibiotic space — particularly those with pending ANDAs for specialty injectables — should treat this outcome as a data point when scoping invalidity strategies and should budget for full-trial exposure rather than early settlement.

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Frequently asked questions

Melinta v Nexus — key questions answered

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Track injectable antibiotic patent risk before your next ANDA filing

This case confirms that IV antibiotic formulation patents can survive a full-trial validity challenge. Use PatSnap Eureka to run FTO analysis against Melinta’s validated patents and monitor for continuation filings that could extend exclusivity beyond current expiry dates.

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