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Amicus Therapeutics v. Lupin: Migalastat Fabry Disease Patent Dispute | PatSnap
Explore in Eureka
Case ID1:22-cv-01465
FiledNov 2022
ClosedDec 2025
Patent Litigation

Amicus Therapeutics v. Lupin: 23-Patent Migalastat Dispute Ends in Consent Judgment

Amicus Therapeutics filed suit in Delaware against Lupin after Lupin filed an ANDA seeking to market generic migalastat for Fabry disease, asserting 23 patents. After 1,141 days of litigation, the parties resolved the action via a consent judgment with an accompanying license agreement — Lupin acknowledging infringement and accepting an injunction while gaining a licensed path to market.

Resolution time
1141days
1,141 days — above the median for Hatch-Waxman ANDA cases resolved before trial in Delaware
Patents asserted
23
US11633388, US11833164, US12042490 and 20 further patents asserted covering migalastat Fabry disease treatment methods
Outcome
Consent Judgment
Consent judgment entered; Lupin acknowledged infringement, injunction issued, license agreement executed
Cost ruling
Each party bears own costs
No fee award — each party to bear its own costs and attorneys’ fees per consent judgment
Published by PatSnap Insights Team · Verified by PatSnap Eureka Data
Case overview

Hatch-Waxman battle over rare-disease migalastat ends in licensed settlement

On November 7, 2022, Amicus Therapeutics US, LLC filed suit in the District of Delaware against Lupin Limited, alleging infringement of 23 U.S. patents covering migalastat — the active ingredient in Galafold, Amicus’s approved pharmacological chaperone therapy for Fabry disease. The trigger was Lupin’s submission of Abbreviated New Drug Application No. 217793 to the FDA under 21 U.S.C. § 355(j), seeking approval to commercially manufacture and sell a generic migalastat product. Under 35 U.S.C. § 271(e)(2), the ANDA filing itself constitutes an act of infringement, enabling Amicus to seek a 30-month stay of FDA approval.

The action concluded on December 22, 2025, when Judge Christopher J. Burke entered an unopposed consent judgment. Under the consent judgment, Lupin formally acknowledged infringement of the asserted patents under § 271(e)(2), accepted a permanent injunction against unauthorized commercial launch of its generic migalastat ANDA product, and simultaneously executed a separate license agreement with Amicus. Claims in the action were dismissed without prejudice. The consent judgment also constitutes a ‘consent decree’ under 21 U.S.C. § 355(j)(5)(B)(iii)(I)(bb), allowing the FDA to grant final ANDA approval on the date of entry — meaning Lupin’s licensed market entry is now possible upon FDA sign-off.

The 1,141-day duration — roughly three years from filing to resolution — is consistent with complex, multi-patent ANDA litigation in Delaware, though the case resolved without trial, claim construction hearing, or any publicly reported dispositive motion ruling. The structure of the resolution, an acknowledgment of infringement paired with a license rather than an outright dismissal, suggests Amicus prioritised enforcing the patent estate and controlling the timing of any generic entry over outright litigation victory. The specific terms of the license agreement — including any authorised generic provisions, royalty rates, or market entry dates — remain confidential and are not disclosed in the public record.

Case at a glance
Case no.1:22-cv-01465
DefendantLupin Limited
CourtDelaware
JudgeChristopher J. Burke
FiledNovember 7, 2022
ClosedDecember 22, 2025
Duration1141 days
OutcomeConsent Judgment
Verdict causeInfringement Action
BasisConsent Judgment
Prior Art Intelligence
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Case data sourced from PACER / Delaware District Court via PatSnap Eureka Litigation Intelligence Explore similar cases ↗
Case timeline

Filing to Consent Judgment in 1141 days

1,141 days — above the median for Hatch-Waxman ANDA cases resolved before trial in Delaware

Case timeline: Complaint filed NOV 7 2022, MAY–JUN — 1141 days total Horizontal timeline showing the three key events in Amicus Therapeutics US, LLC v Lupin Limited from filing to resolution. Source: PACER, Delaware District Court. NOV 7 2022 Complaint filed Pre-trial proceedings DEC 22 2025 Consent Judgment 1141 DAYS TOTAL
Settlement terms

Consent judgment and license: what the resolution means for both parties

Legal mechanism

Consent judgment with acknowledged infringement — not a standard dismissal

Unlike a simple voluntary dismissal, the parties entered a formal consent judgment in which Lupin explicitly acknowledged infringement of the asserted patents under 35 U.S.C. § 271(e)(2). The court retains jurisdiction to enforce both the consent judgment and the accompanying license agreement. The ‘dismissed without prejudice’ language in point 4 refers to the underlying claims, but the injunction and infringement acknowledgment are court-ordered and binding.

Court-ordered consent decree
Patent holder outcome

Amicus secures injunction and infringement acknowledgment across 23 patents

Amicus obtained a permanent injunction barring Lupin from commercialising its ANDA product without a valid Amicus license. Critically, Lupin’s acknowledgment of infringement on the record strengthens Amicus’s enforcement posture against future generic challengers. The consent decree designation also directly controls FDA approval timing, giving Amicus ongoing leverage over Lupin’s market entry. The patent estate covering Fabry disease treatment methods remains intact and enforceable.

Patent estate reinforced
Generic challenger outcome

Lupin gains licensed market access but concedes infringement on record

Lupin secured a path to market via the separately executed license agreement — likely the commercial objective driving the settlement. However, Lupin’s formal acknowledgment of infringement under § 271(e)(2) is a significant concession that may be cited in parallel or future ANDA litigation involving the same patent estate. Each party bears its own costs, suggesting the settlement was reached without significant fee exposure to either side. The specific launch date and royalty terms remain undisclosed.

Licensed entry, infringement conceded
Commercial implications

Structured settlement signals strong Fabry disease patent moat for Amicus

The 23-patent estate, spanning treatment methods for renal impairment and pregnancy populations, represents a layered IP strategy typical of rare-disease innovators seeking to extend commercial exclusivity beyond the core compound patent. The consent decree structure — where infringement is acknowledged rather than litigated away — may deter other ANDA filers from pursuing full invalidity challenges without expecting a licensing outcome. Competing generics, specialty pharma licensees, and payers should monitor the patent expiry dates across the estate.

Rare-disease IP moat reinforced
Legal analysis based on PACER docket records for case 1:22-cv-01465 and PatSnap Eureka litigation intelligence Search PatSnap Eureka ↗
Parties and representation

Full party and counsel information

RoleNameTypeDetail
PlaintiffAmicus Therapeutics US, LLCCompanyRare-disease biopharmaceutical company — holder of 23 migalastat patents covering Fabry disease treatmentSearch in Eureka ↗
DefendantLupin LimitedIndividualIndian generic pharmaceutical manufacturer seeking FDA approval for generic migalastat via ANDA No. 217793Search in Eureka ↗
Plaintiff counselAnna WhitacreAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff counselChad S.C. StoverAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff counselChristina M. BaughAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff counselJohn W. CoxAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff counselJoshua E. NeyAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff counselJoshua M. KalbAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff counselLauren BakerAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff counselMark C. NelsonAttorneyCounsel for Amicus Therapeutics US, LLCSearch in Eureka ↗
Plaintiff law firmBarnes & Thornburg, LLPLaw FirmRepresenting Amicus Therapeutics US, LLCSearch in Eureka ↗
Defendant counselAmy M. LangeAttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant counselDavid A. BilsonAttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant counselJacob C. BritzAttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant counselJohn C. Phillips , Jr.AttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant counselJonathan B. TurpinAttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant counselKeith D. ParrAttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant counselMegan C. HaneyAttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant counselNina VachhaniAttorneyCounsel for Lupin LimitedSearch in Eureka ↗
Defendant law firmPhillips, McLaughlin & Hall PALaw FirmRepresenting Lupin LimitedSearch in Eureka ↗
Presiding judgeJudge Christopher J. BurkeJudgeDelaware District CourtSearch in Eureka ↗
Official verdict

Official order — verbatim text

“This matter is before the Court on the unopposed motion of Plaintiffs Amicus Therapeutics US, LLC and Amicus Therapeutics, Inc. (collectively “Amicus”) and Defendants Lupin Limited and Lupin Pharmaceuticals, Inc. (collectively “Lupin”). WHEREAS, Amicus owns U.S. Patent Nos. 11,633,388; 11,833,164; and 12,042,490 (“the Asserted Patents”); Case 1:22-cv-01465-CJB Document 37 Filed 12/22/25 Page 1 of 5 PageID #: 1856 2 WHEREAS, Lupin submitted Abbreviated New Drug Application No. 217793 (“Lupin’s ANDA”) to the FDA under 21 U.S.C. § 355(j) seeking to obtain approval to commercially manufacture and sell generic migalastat for treatment of Fabry disease; WHEREAS, in this Action, Amicus alleges that Lupin infringed one or more claims of the Asserted Patents under 35 U.S.C. § 271(e)(2) by virtue of Lupin’s submission of Lupin’s ANDA to the FDA and has sought an injunction for such infringement, and Lupin has denied such allegations; WHEREAS, Amicus and Lupin have reached an agreement to finally settle the Litigation as set forth in this Consent Judgment as to Lupin and a separate License Agreement (“License Agreement”) which is contemporaneously and separately being executed; WHEREAS, final settlement of this Action will help Amicus and Lupin avoid the substantial uncertainty and risks involved with prolonged litigation; WHEREAS, final settlement of this Action will permit Amicus and Lupin to save litigation costs, as well as adhere to the judicially recognized mandate that encourages the settlement of litigation whenever possible; WHEREAS, final settlement of the Action serves the public interest by saving judicial resources and avoiding the risks to each of Amicus and Lupin associated with infringement; and WHEREAS, Amicus and Lupin each consent to personal jurisdiction in Delaware for purposes of enforcing the License Agreement; IT IS HEREBY ORDERED, DECREED, and ADJUDGED as follows: 1. The Court has jurisdiction over Amicus and Lupin and the subject matter of this litigation. 2. Lupin acknowledges that it has infringed the Asserted Patents under 35 U.S.C. § 271(e)(2) and that Amicus did not authorize the manufacture, use, sale, offer for sale, importation Case 1:22-cv-01465-CJB Document 37 Filed 12/22/25 Page 2 of 5 PageID #: 1857 3 and distribution of the product described in Lupin’s ANDA 3. Lupin and its successors, assigns, and affiliates, and partners or joint-venturers with are enjoined as of the date hereof from infringing the Asserted Patents by the commercial manufacture, use, offer to sell, sale, importation, or distribution of any generic migalastat products that are the subject of Lupin’s ANDA that is not pursuant to a license granted by Amicus or otherwise exempt from infringement under 35 U.S.C. § 271(e)(1), and from inducing others to infringe or contributing to the infringement of the asserted patents by inducing others to manufacture, use, offer to sell, sale, import, or distribute or contributing to others’ manufacture, use, offer for sale, sale, importation, or distribution of any generic migalastat products that are the subject of Lupin’s ANDA that is not pursuant to a license granted by Amicus or otherwise exempt from infringement under 35 U.S.C. § 271(e)(1). 4. All claims in this Action are hereby dismissed without prejudice. 5. Each party shall bear its own costs and attorneys’ fees. 6. This Court shall retain jurisdiction over Lupin and Amicus for the purpose of enforcing the terms of this Consent Judgment and over any matters related to or arising from the interpretation or enforcement of the License Agreement or any legal or equitable claim concerning the License Agreement by any third party. 7. This Consent Judgment constitutes a “consent decree” pursuant to 21 U.S.C. § 355(j)(5)(B)(iii)(I)(bb), such that Final Approval of Lupin’s Abbreviated New Drug Application No. 217793 under 21 U.S.C. § 355(j)(2)(A)(vii)(IV) may be granted on the date that this Consent Judgment is entered.”
Source: PACER Docket, Case 1:22-cv-01465, Delaware District Court

The consent judgment is notable for its explicit infringement acknowledgment under § 271(e)(2) — an unusually strong concession in ANDA litigation, where defendants more commonly seek dismissal or invalidity findings. The court-ordered injunction is operative immediately and binds Lupin’s successors and affiliates. The dismissal ‘without prejudice’ in paragraph 4 refers to underlying claims rather than the injunction or infringement finding, which are affirmative court orders. The consent decree designation under § 355(j)(5)(B)(iii)(I)(bb) has immediate regulatory significance, controlling FDA’s authority to grant final ANDA approval as of the judgment date.

PACER case 1:22-cv-01465 · Public docket record Explore in Eureka ↗
Patent at issue

US11633388 and 22 further patents — migalastat methods for Fabry disease treatment

Publication No.US11278539B2
Application No.US17/400927
Patent details
ProductMigalastat pharmacological chaperone therapy for Fabry disease
Cited in actionNovember 7, 2022

Publication No.US10874655B2
Application No.US16/678183
Patent details
ProductMigalastat dosing methods for Fabry disease treatment
Cited in actionNovember 7, 2022

Publication No.US11278538B2
Application No.US17/400922
Patent details
ProductMigalastat treatment methods for Fabry disease patients
Cited in actionNovember 7, 2022

Publication No.US11357761B2
Application No.US17/400548
Patent details
ProductMigalastat administration methods for renal and patient subpopulations
Cited in actionNovember 7, 2022

Publication No.US11357762B2
Application No.US17/400614
Patent details
ProductMigalastat dosing regimens for Fabry disease
Cited in actionNovember 7, 2022

Publication No.US11278537B2
Application No.US17/400626
Patent details
ProductMigalastat methods covering specific Fabry disease patient populations
Cited in actionNovember 7, 2022

Publication No.US11278540B2
Application No.US17/401629
Patent details
ProductMigalastat formulation and treatment methods
Cited in actionNovember 7, 2022

Publication No.US11357764B1
Application No.US17/670083
Patent details
ProductMigalastat methods of treating Fabry disease with dosing schedules
Cited in actionNovember 7, 2022

Publication No.US11389436B2
Application No.US17/675532
Patent details
ProductMigalastat treatment methods for patients with renal impairment
Cited in actionNovember 7, 2022

Publication No.US11389437B2
Application No.US17/675587
Patent details
ProductMigalastat methods for Fabry disease in renally impaired patients
Cited in actionNovember 7, 2022

Publication No.US11376244B2
Application No.US17/670095
Patent details
ProductMigalastat Fabry disease treatment covering specific patient subgroups
Cited in actionNovember 7, 2022

Publication No.US11426396B2
Application No.US17/670076
Patent details
ProductMigalastat pharmacological chaperone methods for Fabry disease
Cited in actionNovember 7, 2022

Publication No.US11357765B1
Application No.US17/670088
Patent details
ProductMigalastat treatment regimens for defined Fabry patient populations
Cited in actionNovember 7, 2022

Publication No.US11458128B2
Application No.US17/675544
Patent details
ProductMigalastat methods of use for Fabry disease management
Cited in actionNovember 7, 2022

Publication No.US11304940B2
Application No.US17/393971
Patent details
ProductMigalastat dosing and treatment methods for Fabry disease
Cited in actionNovember 7, 2022

Publication No.US10849890B2
Application No.US16/817925
Patent details
ProductMigalastat oral treatment methods for Fabry disease patients
Cited in actionNovember 7, 2022

Publication No.US10792279B2
Application No.US16/817927
Patent details
ProductMigalastat administration and dosing methods for Fabry disease
Cited in actionNovember 7, 2022

Publication No.US10806727B2
Application No.US16/817918
Patent details
ProductMigalastat Fabry disease treatment including pregnancy populations
Cited in actionNovember 7, 2022

Publication No.US10874657B2
Application No.US16/817895
Patent details
ProductMigalastat methods for treating Fabry disease across patient groups
Cited in actionNovember 7, 2022

Publication No.US11278536B2
Application No.US17/400623
Patent details
ProductMigalastat treatment methods covering specific Fabry patient subsets
Cited in actionNovember 7, 2022

Publication No.US11357763B2
Application No.US17/400932
Patent details
ProductMigalastat pharmacological chaperone dosing for Fabry disease
Cited in actionNovember 7, 2022

Publication No.US11357784B2
Application No.US16/967827
Patent details
ProductMigalastat enzyme enhancement methods for Fabry disease
Cited in actionNovember 7, 2022

Publication No.US10849889B2
Application No.US16/817877
Patent details
ProductMigalastat treatment methods including renally impaired Fabry patients
Cited in actionNovember 7, 2022

The 23 asserted patents cover methods of treating Fabry disease using migalastat, a pharmacological chaperone that stabilises mutant forms of alpha-galactosidase A to reduce lysosomal substrate accumulation. The patent families extend well beyond the compound itself, targeting specific patient populations — notably those with renal impairment and pregnant patients — as well as defined dosing regimens and methods of use. This method-of-treatment claim architecture is consistent with secondary patenting strategies employed to extend commercial exclusivity for approved rare-disease therapies beyond primary composition-of-matter patents.

The Galafold (migalastat) franchise represents a rare oral treatment option in the Fabry disease market, a condition affecting an estimated 1 in 40,000 individuals. Amicus’s layered patent portfolio — spanning multiple application families filed across 2020 and 2021 — creates significant barriers for any ANDA filer attempting to carve around the estate through label carve-outs or invalidity challenges. For pharmaceutical competitors, biosimilar developers, and specialty pharma companies with programs in lysosomal storage disorders, this case underscores the importance of conducting comprehensive FTO analysis across method-of-treatment patent families, not just composition patents.

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

Should you run an FTO against Amicus’s migalastat patent estate?

Any company developing or seeking to commercialise a generic migalastat product, a competing pharmacological chaperone for Fabry disease, or a lysosomal storage disorder therapy with overlapping mechanisms should treat this 23-patent estate as a live risk. The patents cover not just the molecule but specific patient populations and dosing methods — meaning label carve-outs may not fully eliminate infringement exposure. A robust FTO analysis should map proposed product labels against each asserted claim family before any ANDA or NDA submission.

PatSnap Eureka’s FTO Search Agent enables IP and R&D teams to map the full Amicus migalastat patent landscape, identify claim-by-claim exposure across the 23-patent estate, and surface related pending applications that may extend protection further. With citation analysis and legal status tracking, Eureka helps teams identify design-around opportunities and assess invalidity arguments before committing to a regulatory filing strategy in the Fabry disease space.

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Related litigation

Similar Hatch-Waxman ANDA cases involving rare-disease method patents in Delaware

Explore comparable ANDA infringement actions in the Delaware District Court involving rare-disease method-of-treatment patents and pharmacological chaperone or enzyme-related therapies.

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Strategic implications

What this case signals for the rare-disease pharmaceutical IP landscape

A 23-patent consent judgment with acknowledged infringement sets a high bar for generic migalastat challengers and illustrates Amicus’s layered IP strategy for Galafold.

Consent judgments with infringement acknowledgments are enforceable precedent

Unlike settlements that simply dismiss claims, this consent judgment places Lupin’s infringement acknowledgment on the court record. Future generic ANDA filers challenging the same migalastat patent estate should anticipate that Amicus will cite this judgment to support validity and enforceability arguments. IP teams monitoring this space should note that the 23-patent estate spans multiple method-of-treatment claim families.

The 23-patent cluster strategy is a blueprint for rare-disease brand protection

Amicus’s approach — filing overlapping method-of-treatment patents covering distinct patient populations (renal impairment, pregnancy) — creates a dense claim landscape that is costly to challenge in full. For R&D teams developing follow-on therapies or generics in the Fabry disease space, a thorough FTO analysis across the entire Amicus migalastat estate is essential before any regulatory filing.

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Frequently asked questions

Amicus v Lupin — key questions answered

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Track the migalastat patent estate before your next regulatory filing

PatSnap Eureka enables pharma IP and R&D teams to run FTO analysis across the full Amicus migalastat portfolio and monitor new filings in the Fabry disease space. Stay ahead of ANDA risk before it becomes litigation exposure.

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