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.
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.
Filing to Consent Judgment in 1141 days
1,141 days — above the median for Hatch-Waxman ANDA cases resolved before trial in Delaware
Consent judgment and license: what the resolution means for both parties
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 decreeAmicus 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 reinforcedLupin 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 concededStructured 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 reinforcedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Amicus Therapeutics US, LLC | Company | Rare-disease biopharmaceutical company — holder of 23 migalastat patents covering Fabry disease treatmentSearch in Eureka ↗ |
| Defendant | Lupin Limited | Individual | Indian generic pharmaceutical manufacturer seeking FDA approval for generic migalastat via ANDA No. 217793Search in Eureka ↗ |
| Plaintiff counsel | Anna Whitacre | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Chad S.C. Stover | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Christina M. Baugh | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | John W. Cox | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Joshua E. Ney | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Joshua M. Kalb | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Lauren Baker | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Mark C. Nelson | Attorney | Counsel for Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Barnes & Thornburg, LLP | Law Firm | Representing Amicus Therapeutics US, LLCSearch in Eureka ↗ |
| Defendant counsel | Amy M. Lange | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant counsel | David A. Bilson | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant counsel | Jacob C. Britz | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant counsel | John C. Phillips , Jr. | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant counsel | Jonathan B. Turpin | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant counsel | Keith D. Parr | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant counsel | Megan C. Haney | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant counsel | Nina Vachhani | Attorney | Counsel for Lupin LimitedSearch in Eureka ↗ |
| Defendant law firm | Phillips, McLaughlin & Hall PA | Law Firm | Representing Lupin LimitedSearch in Eureka ↗ |
| Presiding judge | Judge Christopher J. Burke | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
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.
US11633388 and 22 further patents — migalastat methods for Fabry disease treatment
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.
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.
Run a freedom-to-operate analysis on US11278539B2 to assess your product’s exposure
Run FTO in Eureka →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.
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 Methods of treating Fabry patients having renal impairment-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.
DecidedAmicus Therapeutics US, LLC’s broader IP enforcement history
Amicus Therapeutics US, LLC’s full litigation history covering prior enforcement, licensing activity, and inter partes review proceedings.
Portfolio viewWhat 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.
License agreement terms will govern the real competitive timeline for generic entry
The publicly disclosed consent judgment reveals that a license exists, but the launch date, royalty structure, and any authorised generic provisions are entirely confidential. The competitive entry window for Lupin — and by extension the signal for other generic filers — depends entirely on undisclosed terms. Firms should monitor FDA Orange Book delisting and patent expiry events as proxy indicators of the licensed entry date.
Delaware ANDA litigation: why the § 355(j)(5)(B)(iii) consent decree designation matters
By designating the consent judgment as a ‘consent decree’ under 21 U.S.C. § 355(j)(5)(B)(iii)(I)(bb), Amicus and Lupin have unlocked immediate FDA approval eligibility for Lupin’s ANDA upon entry of the order. This mechanism — distinct from a standard settlement dismissal — means Lupin could be first to receive final approval, potentially triggering or forfeiting 180-day exclusivity rights relevant to other generic ANDA filers in the Fabry disease space.
Amicus v Lupin — key questions answered
Under the consent judgment entered December 22, 2025, Lupin formally acknowledged infringement of Amicus’s asserted patents under 35 U.S.C. § 271(e)(2) and accepted a permanent injunction against commercialising its generic migalastat ANDA product without an Amicus license. A separate, confidential license agreement was executed simultaneously, providing Lupin a potential path to market.
The complaint listed 23 patents from Amicus’s migalastat portfolio, but the consent judgment references three patents — US11633388, US11833164, and US12042490 — as the ‘Asserted Patents’ at resolution. This is consistent with Hatch-Waxman practice where the asserted patent list narrows over the course of litigation as parties focus on commercially and legally critical claims.
The consent decree designation means the FDA may grant final approval of Lupin’s ANDA No. 217793 as of the date the consent judgment was entered. This is a specific regulatory mechanism distinct from a standard litigation dismissal, and it may affect the 180-day exclusivity period applicable to other generic ANDA filers for migalastat.
The dismissal without prejudice refers to the underlying claims in the action, but the operative terms of the consent judgment — including the infringement acknowledgment and permanent injunction — are affirmative court orders that remain binding. The practical protection for Lupin lies in the license agreement, not the dismissal language. Lupin’s acknowledged infringement remains on the public record.
Migalastat is an oral pharmacological chaperone approved as Galafold for Fabry disease, a rare X-linked lysosomal storage disorder. Amicus’s patent estate covers not just the compound but specific method-of-treatment claims for patient subpopulations including those with renal impairment and pregnant patients. This layered approach is increasingly common in rare-disease IP strategy to extend commercial protection beyond primary composition patents.
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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