Book a demo

Cut patent&paper research from weeks to hours with PatSnap Eureka AI!

Try now
Heron Therapeutics v. Fresenius Kabi — Aprepitant Injectable Emulsion Patent | PatSnap
Explore in Eureka
Case ID1:22-cv-00985
FiledJul 2022
ClosedDec 2024
Patent Litigation

Heron Therapeutics v. Fresenius Kabi: Cinvanti Aprepitant Patent Win (866 Days)

Heron Therapeutics secured a final judgment in the Delaware District Court blocking Fresenius Kabi USA from launching a generic aprepitant injectable emulsion (ANDA No. 214639) until expiry of US9561229 and US9974794. The court found infringement and validity on all contested claims across both patents, delivering a complete plaintiff win after 866 days of litigation.

Resolution time
866days
866 days — above the median for ANDA Hatch-Waxman trials in Delaware District Court
Patents asserted
9
US9561229 and 8 further patents asserted covering Cinvanti® aprepitant injectable emulsion
Outcome
Judgment on the merits for Plaintiff
Final judgment on merits; all claims and counterclaims resolved in Heron’s favour
Cost ruling
Costs Awarded
Heron may seek costs per Fed. R. Civ. P. 54; attorneys’ fees motion window preserved
Published by PatSnap Insights Team · Verified by PatSnap Eureka Data
Case overview

Heron Blocks Fresenius Generic Aprepitant on All Counts

Heron Therapeutics, Inc. filed suit on 27 July 2022 in the District of Delaware against Fresenius Kabi USA, LLC and its parent Fresenius Kabi AG, asserting infringement of nine patents covering Cinvanti®, its branded 130 mg/18 mL (7.2 mg/mL) aprepitant injectable emulsion indicated for chemotherapy-induced nausea and vomiting. The litigation was triggered by Fresenius’s filing of Abbreviated New Drug Application No. 214639, a standard Hatch-Waxman Paragraph IV certification pathway seeking FDA approval to market a generic version of the product before patent expiry.

On 9 December 2024 — 866 days after filing — Judge William C. Bryson entered final judgment entirely in Heron’s favour. The court held that the manufacture, use, sale, offer for sale, or importation of Fresenius’s ANDA product would infringe claims 9, 10, and 21 of US9561229 and claims 9 and 10 of US9974794, and that those claims are not invalid. Under 35 U.S.C. § 271(e)(4)(A) and (B), FDA approval of ANDA No. 214639 is blocked and Fresenius is enjoined from commercialising the product until no earlier than the latest expiry date of the two adjudicated patents.

The 866-day duration is consistent with a fully litigated Hatch-Waxman bench trial rather than an early settlement, suggesting Fresenius contested validity and non-infringement vigorously before trial. The public record does not disclose the expiry dates of the ‘229 and ‘794 patents, meaning the precise exclusivity runway Heron secured remains to be calculated from patent term data. Heron retains the right to apply for further relief if additional exclusivities arise, and both parties retain the right to appeal, with fee motions held open for 60 days post-appeal resolution.

Case at a glance
Case no.1:22-cv-00985
CourtDelaware
JudgeWilliam C. Bryson
FiledJuly 27, 2022
ClosedDecember 9, 2024
Duration866 days
OutcomeJudgment on the merits for Plaintiff
Verdict causeInfringement Action
BasisJudgment on the merits for Plaintiff
Prior Art Intelligence
See what prior art exists on this patent.
Eureka scans millions of patents and papers to surface prior art that may have invalidated these claims before costly litigation begins.
Check Prior Art
Case data sourced from PACER / Delaware District Court via PatSnap Eureka Litigation Intelligence Explore similar cases ↗
Case timeline

Filing to Judgment on the merits for Plaintiff in 866 days

866 days — above the median for ANDA Hatch-Waxman trials in Delaware District Court

Case timeline: Complaint filed JUL 27 2022, OCT–NOV — 866 days total Horizontal timeline showing the three key events in Heron Therapeutics, Inc. v Fresenius Kabi USA, LLC from filing to resolution. Source: PACER, Delaware District Court. JUL 27 2022 Complaint filed Pre-trial proceedings DEC 9 2024 Judgment on the merits for Plaintiff 866 DAYS TOTAL
Court ruling

Final judgment for Heron: what the ruling means for both parties

Legal mechanism

Hatch-Waxman § 271(e)(4) injunction fully enforced

Under 35 U.S.C. § 271(e)(4)(A) and (B), a plaintiff win in an ANDA infringement action triggers two automatic remedies: the effective date of any FDA approval is deferred to no earlier than patent expiry, and the ANDA filer is permanently enjoined from commercial launch before that date. Both remedies were granted here in full, with Fresenius also required to notify the FDA of the judgment within 14 days.

Statutory injunction granted
Patent holder outcome

Cinvanti® exclusivity preserved through patent term

Heron retains uninterrupted market exclusivity for Cinvanti® for the remaining life of US9561229 and US9974794. The judgment on validity — finding claims 9, 10, and 21 of the ‘229 patent and claims 9 and 10 of the ‘794 patent not invalid — strengthens the enforceability of these patents against any future ANDA filers. Heron also preserved its right to seek costs and an exceptional-case fee award under 35 U.S.C. § 285.

Full exclusivity maintained
Generic challenger outcome

Fresenius launch blocked; ANDA approval deferred

Fresenius Kabi USA cannot commercialise ANDA No. 214639 until at least the expiry of both adjudicated patents. Fresenius Kabi AG is expressly bound by the judgment under the earlier stipulation. Fresenius retains the right to appeal; if an appeal is filed, the attorneys’ fees window is tolled. A successful Federal Circuit appeal would be the primary remaining avenue to overturn the injunction.

Commercial launch prohibited
Commercial implications

Aprepitant injectable market remains closed to generics

The ruling raises the competitive bar for any pharmaceutical company seeking to enter the aprepitant injectable emulsion market via the Hatch-Waxman pathway. The court’s validity findings on the specific formulation claims of US9561229 and US9974794 suggest future challengers will face a strengthened prior-art record. Rival ANDA filers should reassess freedom-to-operate positions and consider whether design-around formulations are commercially viable before investing in clinical bioequivalence studies.

Generic entry delayed
Legal analysis based on PACER docket records for case 1:22-cv-00985 and PatSnap Eureka litigation intelligence Search PatSnap Eureka ↗
Parties and representation

Full party and counsel information

RoleNameTypeDetail
PlaintiffHeron Therapeutics, Inc.CompanySpecialty pharmaceutical company — holder of US9561229 covering Cinvanti® aprepitant injectable emulsionSearch in Eureka ↗
DefendantFresenius Kabi USA, LLCCompanyGeneric pharmaceutical manufacturer seeking ANDA approval for aprepitant injectable emulsion (ANDA No. 214639)Search in Eureka ↗
Co-DefendantFresenius Kabi, AGCompanySearch in Eureka ↗
Plaintiff counselAnthony David RaucciAttorneyCounsel for Heron Therapeutics, Inc.Search in Eureka ↗
Plaintiff counselBruce M. WexlerAttorneyCounsel for Heron Therapeutics, Inc.Search in Eureka ↗
Plaintiff counselChristopher P. HillAttorneyCounsel for Heron Therapeutics, Inc.Search in Eureka ↗
Plaintiff counselIsaac S. AshkenaziAttorneyCounsel for Heron Therapeutics, Inc.Search in Eureka ↗
Plaintiff counselJack B. BlumenfeldAttorneyCounsel for Heron Therapeutics, Inc.Search in Eureka ↗
Plaintiff counselJeremy A. TiganAttorneyCounsel for Heron Therapeutics, Inc.Search in Eureka ↗
Plaintiff counselMark Russell SperlingAttorneyCounsel for Heron Therapeutics, Inc.Search in Eureka ↗
Plaintiff law firmMorris, Nichols, Arsht & Tunnell LLPLaw FirmRepresenting Heron Therapeutics, Inc.Search in Eureka ↗
Defendant counselChad F. WatsonAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselDaniel TaylorAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselEve H. OrmerodAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselHelen H. JiAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselImron T. AlyAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselJulie A. VernonAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselKevin M. NelsonAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselMallory McMahonAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant counselNeal C. BelgamAttorneyCounsel for Fresenius Kabi USA, LLCSearch in Eureka ↗
Defendant law firmSmith, Katzenstein & Jenkins LLPLaw FirmRepresenting Fresenius Kabi USA, LLCSearch in Eureka ↗
Presiding judgeJudge William C. BrysonJudgeDelaware District CourtSearch in Eureka ↗
Official verdict

Official order — verbatim text

“Final Judgment is entered in favor of Plaintiff Heron Therapeutics, Inc. (“Heron”) and against Defendant Fresenius Kabi USA, LLC (“Fresenius”)1 on all claims and counterclaims with respect to United States Patent No. 9,561,229 (“the ’229 patent”) and United States Patent No. 9,974,794 (“the ’794 patent”). The court holds that the manufacture, use, offer forsale, or sale within the United States, or importation into the United States, of Fresenius’s Abbreviated New Drug Application (“ANDA”) product that is the subject of ANDA No. 214639 before the expiration of these patents would infringe claims 9, 10, and 21 of the ’229 patent and claims 9 and 10 of the ’794 patent. The court also holds that claims 9, 10, and 21 of the ’229 patent and claims 9 and 10 of the ’794 patent are not invalid. 2. Pursuant to 35 U.S.C. § 271(e)(4)(A), the effective date of any approval of Fresenius’s ANDA No. 214639 shall be no earlier than the latest date of expiration of the ’229 and 1 Pursuant to the Stipulation and Order Dismissing Without Prejudice Defendant Fresenius Kabi AG and Amending Caption to Reflect the Same (D.I. 13 ¶ 1), Fresenius Kabi AG is bound by this Final Judgment, as well as any stipulation, decision, order, or judgment, including any injunction, rendered as to Fresenius in this action. HERON THERAPEUTICS, INC., Plaintiff, v. FRESENIUS KABI USA, LLC, Defendant. Case 1:22-cv-00985-WCB Document 195 Filed 12/09/24 Page 1 of 3 PageID #: 8380 2 ’794 patents. If Heron becomes entitled to any other exclusivities that are not referenced herein, Heron may apply to the court for further relief as may be appropriate. 3. Pursuant to 35 U.S.C. § 271(e)(4)(B), Fresenius is hereby enjoined from making, using, offering to sell, or selling within the United States, or importing into the United States, the product that is the subject of ANDA No. 214639 until no earlier than the latest date of expiration of the ’229 and ’794 patents. 4. In accordance with 21 C.F.R. § 314.107(e), Fresenius shall submit a copy of this Final Judgment to the FDA within fourteen (14) days of the date of entry of this Final Judgment by the Court. 5. Pursuant to Fed. R. Civ. P. 54, D. Del. LR 54.1, and 28 U.S.C. § 1920, Heron may seek its costs, subject to Paragraphs 6 and 7, in an amount to be determined by the Clerk of the Court. 6. In the event that a party appeals this Final Judgment, any motion for attorneys’ fees or submission of a bill of costs, including any motion that this case is exceptional under 35 U.S.C. § 285, shall be considered timely if filed within 60 days after the expiration of the time to petition for certiorari to the United States Supreme Court or, if the appeal is withdrawn or dismissed, within 60 days after such withdrawal or dismissal. 7. In the event that no party appeals this Final Judgment, any motion for attorneys’ fees or submission of a bill of costs, including any motion that this case is exceptional under 35 U.S.C. § 285, shall be considered timely if filed within 60 days after the expiration of the time for filing a notice of appeal under Fed. R. App. P. 3 and 4.”
Source: PACER Docket, Case 1:22-cv-00985, Delaware District Court

The final judgment is comprehensive in scope: the court resolved both infringement and validity on all contested claims of the two adjudicated patents, leaving no claim surviving in Fresenius’s favour. The express finding that claims are ‘not invalid’ carries particular weight — it goes beyond mere dismissal of invalidity counterclaims and reflects an affirmative merits adjudication, which would need to be overcome on appeal under the clear-error or de-novo standard depending on whether invalidity turned on factual or legal issues. The statutory relief under § 271(e)(4) is self-executing upon entry of judgment, meaning the FDA block and injunction are immediately operative without further court order.

PACER case 1:22-cv-00985 · Public docket record Explore in Eureka ↗
Patent at issue

US9561229 & US9974794 — Aprepitant Injectable Emulsion Formulation Patents

Publication No.US10624850B2
Application No.US15/965638
Patent details
Productaprepitant injectable emulsion formulation — Cinvanti® CINV treatment
Cited in actionJuly 27, 2022

Publication No.US10953018B2
Application No.US16/669262
Patent details
Productaprepitant injectable emulsion for CINV — method of use
Cited in actionJuly 27, 2022

Publication No.US9974793B2
Application No.US15/705201
Patent details
Productaprepitant injectable emulsion composition and method
Cited in actionJuly 27, 2022

Publication No.US9974794B2
Application No.US15/705208
Patent details
Productaprepitant injectable emulsion formulation variant
Cited in actionJuly 27, 2022

Publication No.US11173118B2
Application No.US16/820311
Patent details
Productaprepitant injectable emulsion — extended patent family
Cited in actionJuly 27, 2022

Publication No.US10500208B2
Application No.US15/398928
Patent details
Productaprepitant injectable emulsion — pharmaceutical composition
Cited in actionJuly 27, 2022

Publication No.US9808465B2
Application No.US14/859013
Patent details
Productaprepitant injectable emulsion — early formulation claims
Cited in actionJuly 27, 2022

Publication No.US9561229B2
Application No.US15/083071
Patent details
Productaprepitant injectable emulsion — core composition claims
Cited in actionJuly 27, 2022

Publication No.US9974742B2
Application No.US15/012532
Patent details
Productaprepitant — pharmaceutical use and formulation method
Cited in actionJuly 27, 2022

US9561229 and US9974794 are members of Heron’s patent family covering Cinvanti®, a 130 mg/18 mL (7.2 mg/mL) aprepitant injectable emulsion approved for prevention of chemotherapy-induced nausea and vomiting (CINV). Aprepitant is a neurokinin-1 (NK1) receptor antagonist; the patented claims cover specific formulation parameters of an intravenous emulsion — a delivery form that avoids the solubilising agents associated with earlier aprepitant formulations and offers a clinically distinct administration profile. The application numbers (US15/083071 and US15/705208) suggest mid-2010s priority dates, consistent with Cinvanti®’s 2017 FDA approval.

Heron assembled a nine-patent portfolio around Cinvanti®, providing layered protection at the formulation, composition, and method-of-use levels. The Delaware court’s validity ruling on US9561229 and US9974794 suggests these core formulation claims survived prior-art scrutiny — a commercially significant finding given that NK1 receptor antagonists are a well-explored therapeutic class. For competitors developing injectable antiemetic products or alternative aprepitant delivery platforms, the adjudicated claims define a significant exclusionary perimeter that must be navigated through design-around formulation work or successful appellate challenge.

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

Should you run an FTO against US9561229 and US9974794?

Any company developing an injectable aprepitant product — whether via ANDA, 505(b)(2), or novel formulation — should conduct a freedom-to-operate analysis against the adjudicated claims of US9561229 and US9974794 before advancing to IND or ANDA filing. The court’s infringement findings on claims 9, 10, and 21 of the ‘229 patent and claims 9 and 10 of the ‘794 patent define the specific formulation parameters that triggered liability; understanding how those claims read on your proposed product is essential to assessing litigation risk and development pathway viability.

PatSnap Eureka’s FTO Search Agent can map the adjudicated claim language of US9561229 and US9974794 against your formulation specifications, identify the full nine-patent Heron portfolio for claim-by-claim risk scoring, and surface design-around prior art that was not raised in this litigation. For in-house teams modelling generic entry timelines or BD teams evaluating aprepitant pipeline assets, Eureka also provides patent term extension data to calculate the true exclusivity expiry — critical intelligence that the public judgment record does not disclose.

PatSnap Eureka FTO Search

Run a freedom-to-operate analysis on US10624850B2 to assess your product’s exposure

Run FTO in Eureka →
Related litigation

Similar Hatch-Waxman Injectable Pharmaceutical Cases in Delaware

Cases involving ANDA paragraph IV challenges to injectable pharmaceutical formulation patents litigated in Delaware District Court under Hatch-Waxman.

🔍
Access 40+ similar cases in PatSnap Eureka
Heron Therapeutics, Inc. patent enforcement history, Delaware case history, Heron Therapeutics, Inc.’s full IP portfolio, and comparable case analysis
Comparable ANDA injunctionsNK1 antagonist patent casesHeron portfolio litigationInjectable emulsion IP disputes
Unlock similar cases in Eureka →
Strategic implications

What this case signals for the injectable pharmaceutical IP landscape

A complete Hatch-Waxman plaintiff win on both infringement and validity reshapes the competitive calculus for aprepitant generics and analogous injectable emulsion products.

Validity win doubles the deterrent effect for future ANDA filers

When a Hatch-Waxman court upholds validity alongside infringement, the adjudicated claims gain a significantly stronger presumption in any subsequent challenge. Generic manufacturers considering a Paragraph IV certification against US9561229 or US9974794 now face an established adverse validity record in addition to the infringement finding.

Formulation-level patent claims proved decisive in this emulsion dispute

The asserted claims relate to specific formulation parameters of an aprepitant injectable emulsion — a technically narrow but commercially powerful claim set. This outcome reinforces the value of prosecuting granular formulation claims in specialty injectable portfolios, particularly where bioequivalence requirements constrain a generic filer’s ability to design around.

🔒
Full strategic analysis in PatSnap Eureka
Unlock deeper analysis of this Delaware District Court Hatch-Waxman ruling across the injectable pharmaceutical sector.
Patent term expiry datesNon-adjudicated patent riskAppeal probability signals
Unlock full analysis →
Analysis powered by PatSnap Eureka Litigation Intelligence Explore in Eureka ↗
Frequently asked questions

Heron v Fresenius — key questions answered

Still have questions? PatSnap Eureka can answer them instantly from patent and litigation data. Ask Eureka ↗
PatSnap Eureka

Track aprepitant patent risk before your next ANDA filing

Use PatSnap Eureka to run an FTO analysis against the full Heron Cinvanti® patent portfolio, calculate patent term expiry for US9561229 and US9974794, and monitor for new continuation filings that could extend exclusivity.

Ask anything about this case.
PatSnap Eureka searches patents and litigation data to answer instantly.
Powered by PatSnap Eureka
Link copied to clipboard

Related Litigation Cases

Help us improve this page

Found incorrect or outdated information? Let us know and we'll get it fixed.