Boehringer Ingelheim v. Mylan: Linagliptin Patent Dispute Ends in Consent Judgment After 2,119 Days
Boehringer Ingelheim’s four-entity plaintiff group sued Mylan across three consolidated actions over five patents protecting Tradjenta® and Jentadueto® linagliptin diabetes therapies. The case closed on 24 November 2025 via a consent judgment that permanently enjoins Mylan from launching its generic ANDA products until the last of the five patents expires — a commercially significant outcome spanning nearly six years of litigation.
Six-year Hatch-Waxman battle locks Mylan out of linagliptin generics market
Boehringer Ingelheim Pharmaceuticals Inc. and three affiliated entities filed suit on 5 February 2020 in the West Virginia Northern District Court before Judge Thomas S. Kleeh, asserting infringement of patents covering their blockbuster type 2 diabetes drugs Tradjenta® (5 mg linagliptin) and Jentadueto® (2.5 mg linagliptin/metformin). The litigation encompassed three consolidated civil actions — Nos. 1:20-cv-00019, 1:20-cv-00090, and 1:24-cv-00082 — and ultimately involved five patents: US9,415,016; US9,486,526; US10,022,379; US11,033,552; and US11,911,388.
The case closed on 24 November 2025 through a court-entered consent judgment negotiated between the parties. Under its terms, Mylan’s ANDA products — generic equivalents of both Tradjenta® and Jentadueto® — are judicially confirmed to infringe the asserted patent clusters, and Mylan is permanently enjoined from manufacturing, selling, or distributing those generics in the United States until the latest expiration of all five patents, including any patent term extensions. All underlying claims and counterclaims were dismissed without prejudice and without any award of costs or attorneys’ fees.
A 2,119-day litigation cycle is notable even by Hatch-Waxman standards, likely reflecting the complexity of consolidating three separate ANDA actions and the breadth of the patent portfolio asserted. The addition of a third civil action in 2024 — four years into the original dispute — suggests that Boehringer continued to expand its enforcement perimeter as new patents issued. The precise commercial terms of any underlying licensing or settlement agreement remain confidential; the public record confirms only the injunction, the infringement findings, and the maintenance of Mylan’s Paragraph IV certifications.
Filing to Consent Judgment in 2119 days
5.8 years from filing to consent judgment — well above the typical 2–3 year ANDA trial timeline
Consent judgment entered: what the agreed injunction means for both parties
Consent judgment is a binding court order, not merely a settlement
A consent judgment has the force of a judicial decree. Unlike a private settlement agreement, it is enforceable directly through the court — including by preliminary injunction — if violated. Paragraph 8 of the order preserves jurisdiction in this district for enforcement. The court found jurisdiction and formally adjudged infringement at Mylan’s request, giving Boehringer a strong enforcement instrument without a contested trial.
Court-ordered injunctionBoehringer secures full market exclusivity through all five patent expiries
The consent judgment delivers Boehringer its primary commercial objective: Mylan is enjoined from entering the US market with generic linagliptin or linagliptin/metformin until the latest of the five patent expiries, including any PTE or PTA. Infringement findings on six patent/product combinations are judicially recorded, strengthening Boehringer’s position against any future ANDA challengers who may attempt to distinguish Mylan’s litigation posture.
Exclusivity preservedMylan enjoined from launch but retains ANDA approvals and Paragraph IV certs
Mylan is blocked from commercialising its ANDA products during the patent term but retains meaningful optionality: the FDA may grant or maintain final ANDA approvals at any time, and Mylan keeps its Paragraph IV certifications. This preserves Mylan’s ability to launch immediately upon patent expiry — or earlier if any patent is later invalidated in a separate proceeding — without re-filing its ANDAs.
ANDA intact, launch deferredLinagliptin generics market entry delayed; portfolio breadth deters rivals
Five-patent coverage across two formulations signals a layered exclusivity strategy typical of mature branded small-molecule franchises. Competitors holding their own linagliptin ANDAs should note that patents US11,033,552 and US11,911,388 — the most recently issued — likely carry expiry dates well into the 2030s, suggesting extended brand protection. The infringement findings, though consent-based, may influence how other generic filers approach design-around strategies.
Extended brand windowFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Boehringer-Ingelheim | Individual | Global pharmaceutical group — holder of US9486526B2 and four further linagliptin patentsSearch in Eureka ↗ |
| Co-Plaintiff | Boehringer Ingelheim Pharma GmbH & Co., KG | Company | Search in Eureka ↗ |
| Co-Plaintiff | Boehringer Ingelheim Corporation | Company | Search in Eureka ↗ |
| Co-Plaintiff | Boehringer Ingelheim International, GMBH | Company | Search in Eureka ↗ |
| Defendant | Mylan, NV | Company | Mylan NV and affiliates, ANDA filers seeking generic approval for linagliptin tabletsSearch in Eureka ↗ |
| Co-Defendant | Mylan Laboratories Limited | Individual | Search in Eureka ↗ |
| Co-Defendant | Mylan, Inc. | Company | Search in Eureka ↗ |
| Plaintiff counsel | Andrew Walter | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Ashley Ross | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Bryan S. Hales | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Christopher Ilardi | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Christopher J. Citro | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | David R. Pogue | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Eliana Applebaum | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | James F. Companion | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | James F. Hurst | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Jeanna M. Wacker | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Jordan Lee Damron | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Leora Ben-Ami | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Mira Atanassova Mulvaney | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Sam Kwon | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Sandra K. Law | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Shaoyao Yu | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Steven Robert Ruby | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Tasha Francis Gerasimow | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff counsel | Thomas F. Fleming | Attorney | Counsel for Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff law firm | Carey, Douglas, Kessler & Ruby, PLLC | Law Firm | Representing Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff law firm | Carey, Douglas, Kessler and Ruby PLLC | Law Firm | Representing Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff law firm | Kirkland & Ellis LLP (Chicago) | Law Firm | Representing Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff law firm | Kirkland & Ellis LLP (NY) | Law Firm | Representing Boehringer-IngelheimSearch in Eureka ↗ |
| Plaintiff law firm | Schrader Companion Duff & Law, PLLC | Law Firm | Representing Boehringer-IngelheimSearch in Eureka ↗ |
| Defendant counsel | Deepro R. Mukerjee | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Garrett Matthew Spiker | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Gordon H. Copland | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Guylaine Hache | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Jillian Schurr-Hendrix | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Jitendra Malik | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Joseph M. Janusz | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Lance A. Soderstrom | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Matthew M. Holub | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | Sara M. Pistilli | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant counsel | William J. O’Brien | Attorney | Counsel for Mylan, NVSearch in Eureka ↗ |
| Defendant law firm | Katten Muchin Rosenman LLP | Law Firm | Representing Mylan, NVSearch in Eureka ↗ |
| Defendant law firm | Katten Muchin Rosenman LLP (Chicago) | Law Firm | Representing Mylan, NVSearch in Eureka ↗ |
| Defendant law firm | Katten Muchin Rosenman LLP (NC) | Law Firm | Representing Mylan, NVSearch in Eureka ↗ |
| Defendant law firm | Steptoe & Johnson PLLC | Law Firm | Representing Mylan, NVSearch in Eureka ↗ |
| Defendant law firm | Steptoe & Johnson PLLC – Bridgeport | Law Firm | Representing Mylan, NVSearch in Eureka ↗ |
| Presiding judge | Judge Thomas S Kleeh | Judge | West Virginia Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The consent judgment’s infringement findings in paragraphs 3 and 4 are judicially operative declarations, not mere admissions: the court formally adjudged that, absent a licence, specific Mylan ANDA products infringe specific patent clusters. For Boehringer, this creates a robust enforcement record. For Mylan, the findings are expressly limited to ‘this action only,’ preserving theoretical invalidity arguments in any future proceeding. The dismissal without prejudice of all other claims leaves counterclaims — including any invalidity or inequitable conduct defences — unresolved on the merits, meaning neither party obtained a final adjudication beyond the infringement declarations expressly consented to.
US9486526B2 — linagliptin formulation patent at the core of Tradjenta® ANDA dispute
US9,486,526 (application no. US14/294,630) is one of five Boehringer Ingelheim patents asserted in this litigation, all covering aspects of linagliptin — a DPP-4 inhibitor approved for type 2 diabetes management. The ‘526 patent was specifically found to be infringed by Mylan’s generic equivalent of the Tradjenta® 5 mg linagliptin tablet (ANDA No. 208431). As part of a continuation family, the patent sits within a portfolio that also covers the linagliptin/metformin combination marketed as Jentadueto®, demonstrating layered formulation and method-of-use coverage across both commercial products.
The five-patent portfolio — spanning US9,415,016 through the recently issued US11,911,388 — reflects a deliberate evergreening strategy in the DPP-4 inhibitor class, where new continuation filings were timed to maintain litigation leverage as the original patents aged. For competitors in the oral antidiabetic space, the ‘388 patent’s 2024 issuance and its inclusion in a 2024 civil action demonstrates that the portfolio is actively expanding. Any entity considering ANDA filings for linagliptin-containing products must evaluate the full continuation family to assess realistic first-generic launch timing.
Should you run an FTO against US9486526B2 and the Boehringer linagliptin portfolio?
Any pharmaceutical or generic drug company developing DPP-4 inhibitor formulations, linagliptin combination products, or dosage forms similar to Tradjenta® or Jentadueto® should treat this patent family as a high-priority FTO target. The consent judgment confirms that tablet formulations covered by five separate patents were found to infringe — meaning design-arounds must clear all five claims simultaneously, not just US9,486,526 in isolation. R&D teams evaluating metformin/linagliptin fixed-dose combinations face the most acute risk given the ‘016 and ‘379 patent coverage of the Jentadueto® equivalent.
PatSnap Eureka’s FTO Search Agent can map the full Boehringer linagliptin continuation family, identify which claims cover specific formulation parameters (dosage, excipient composition, administration method), and flag any post-grant review petitions filed against the ‘552 or ‘388 patents. For ANDA filers, Eureka can overlay patent expiry projections — including PTE and PTA adjustments — to model the realistic earliest generic entry date across all five patents, enabling more accurate go/no-go decisions before an ANDA filing.
Run a freedom-to-operate analysis on US9486526B2 to assess your product’s exposure
Run FTO in Eureka →Similar Hatch-Waxman DPP-4 inhibitor patent cases in US district courts
Explore comparable Hatch-Waxman ANDA infringement actions involving DPP-4 inhibitor and oral antidiabetic drug patents litigated in US district courts.
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 Mylan Pharms’s 5 mg linagliptin tablets-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.
DecidedBoehringer-Ingelheim’s broader IP enforcement history
Boehringer-Ingelheim’s full litigation history covering prior enforcement, licensing activity, and inter partes review proceedings.
Portfolio viewWhat this case signals for the Hatch-Waxman and diabetes drug IP landscape
A six-year, five-patent consent judgment in linagliptin offers concrete lessons for ANDA filers, brand defenders, and FTO analysts in the GLP-1/DPP-4 space.
Portfolio depth, not single-patent breadth, is the ANDA defence playbook
Boehringer’s ability to assert five patents across two formulations — and to add a third action in 2024 as new patents issued — illustrates how a rolling continuation strategy can sustain Hatch-Waxman pressure throughout a litigation cycle. Generic entrants should map the full continuation family, not just the originally asserted patents, before filing Paragraph IV certifications.
Consent judgments with infringement findings create precedent risk for subsequent ANDA filers
Although the findings are explicitly limited to this action, a judicially entered infringement determination against a specific ANDA product strengthens the brand holder’s credibility in future Hatch-Waxman suits. Other generic filers targeting the same Tradjenta® or Jentadueto® formulations should expect Boehringer to cite these findings and may face a higher settlement threshold.
Paragraph IV cert retention creates a binary launch trigger — monitor patent expiry dates closely
Mylan retains FDA approval eligibility and Paragraph IV certifications. If any of the five patents is successfully challenged via IPR or ex parte reexamination, Mylan could launch immediately. Brands and competing generics should track PTAB petition filings against the ‘552 and ‘388 patents — the newest, most vulnerable to post-grant review.
West Virginia Northern District consent judgments: enforcement jurisdiction preserved on-site
Paragraph 8 locks enforcement jurisdiction in this district and waives personal jurisdiction and venue defences. Any violation — including an attempted soft launch — is actionable immediately in W.D. West Virginia. Competitors and distributors dealing with Mylan’s linagliptin supply chain should be aware that even indirect involvement could trigger contempt exposure.
Boehringer-Ingelheim v Mylan — key questions answered
The consent judgment, entered 24 November 2025, formally adjudged that Mylan’s generic linagliptin ANDA products infringe specific Boehringer patents. The ‘526, ‘552, and ‘388 patents are infringed by the generic Tradjenta® equivalent; the ‘016, ‘379, and ‘388 patents are infringed by the generic Jentadueto® equivalent. Mylan is permanently enjoined from US market entry until the latest expiry of all five patents.
Yes. Paragraph 7 of the consent judgment explicitly states that nothing prevents the FDA from granting or maintaining final approval to Mylan’s ANDAs 208430 and 208431 at any time. Mylan also retains its Paragraph IV certifications. The injunction blocks commercial activity, not regulatory approval — Mylan may launch immediately upon patent expiry or earlier if any patent is invalidated.
Five patents were at issue: US9,415,016 and US10,022,379 cover the Jentadueto® linagliptin/metformin combination; US9,486,526 covers the Tradjenta® linagliptin tablet; US11,033,552 covers both products (Lina/Met); and US11,911,388 covers both ANDA products. The ‘388 patent, issued in 2024, was asserted in the third consolidated civil action filed the same year.
The 2,119-day duration likely reflects the complexity of consolidating three separate ANDA actions, the breadth of a five-patent portfolio asserted across two commercial products, and the addition of a third civil action in 2024 as US11,911,388 issued. Hatch-Waxman cases with large patent portfolios and multiple consolidated actions routinely run longer than single-patent ANDA disputes, and the parties’ eventual consent judgment suggests prolonged but ultimately successful settlement negotiations.
Paragraph 10 dismisses all claims, counterclaims, and affirmative defenses without prejudice, meaning neither party obtained a final ruling on those remaining issues — including any invalidity or inequitable conduct defences Mylan may have asserted. Practically, the injunction and infringement findings in paragraphs 3–5 are the operative provisions. The without-prejudice dismissal preserves theoretical rights to refile, but the injunction makes most counterclaims commercially moot unless a patent is later challenged via IPR.
Monitor the linagliptin patent landscape before your next ANDA or FTO decision
The Boehringer v. Mylan consent judgment covers five patents across two commercial products — but new continuations may still issue. Use PatSnap Eureka to track real-time patent filings, PTAB petitions, and ANDA activity across the full DPP-4 inhibitor class before committing to a Paragraph IV strategy.
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