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Actelion & Nippon Shinyaku v. MSN Labs — Selexipag Patent | PatSnap
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Case ID1:23-cv-00731
FiledJul 2023
ClosedJun 2024
Patent Litigation

Actelion & Nippon Shinyaku v. MSN Labs: Selexipag Consent Judgment & Permanent Injunction

Actelion Pharmaceuticals and Nippon Shinyaku sued MSN Laboratories in Delaware over two selexipag injection patents covering Uptravi IV, a pulmonary arterial hypertension therapy. MSN stipulated to validity, enforceability, and a permanent injunction blocking its ANDA product — resolving the case in 357 days without a merits trial.

Resolution time
357days
357 days — faster than the median ANDA patent case in Delaware, which typically exceeds 2 years through trial
Patents asserted
2
US8791122B2 and US9284280B2 — selexipag for injection 1.8 mg/vial (Uptravi IV), pulmonary arterial hypertension
Outcome
Consent Judgment
MSN stipulated to validity and enforceability; permanent injunction entered blocking ANDA product until patent expiry
Cost ruling
No Costs Awarded
Parties agreed: no costs, disbursements, or attorney fees awarded to either side
Published by PatSnap Insights Team · Verified by PatSnap Eureka Data
Case overview

ANDA challengers blocked on selexipag injection via consent judgment

Filed on 6 July 2023 in the District of Delaware, this Hatch-Waxman ANDA infringement action was brought by Actelion Pharmaceuticals US, Inc., Actelion Pharmaceuticals Ltd., and Nippon Shinyaku Co., Ltd. against MSN Laboratories Private Limited and MSN Pharmaceuticals Inc. The patents-in-suit — US8791122B2 and US9284280B2 — protect selexipag for injection 1.8 mg/vial, the active ingredient in Uptravi IV, a prostacyclin receptor agonist approved for pulmonary arterial hypertension.

The case closed on 27 June 2024 via a stipulated consent judgment and order of permanent injunction. Critically, MSN agreed that both patents are valid and enforceable — a significant concession that forecloses validity challenges in this action. The injunction bars MSN from making, using, selling, offering for sale, or importing its ANDA product (ANDA No. 218430) in the United States until the patents expire, including any patent term extensions, adjustments, and associated exclusivity periods.

Resolution in 357 days — without a Markman hearing or trial on the merits — is notably swift for a multi-patent Hatch-Waxman case in Delaware and suggests MSN assessed its litigation position unfavorably at an early stage. The public record does not disclose whether a licensing arrangement or commercial agreement accompanied the consent judgment; the claims were dismissed without prejudice, leaving open the theoretical possibility of future proceedings, though MSN waived all appeal rights under the judgment.

Case at a glance
Case no.1:23-cv-00731
CourtDelaware
JudgeN/A
FiledJuly 6, 2023
ClosedJune 27, 2024
Duration357 days
OutcomeConsent Judgment
Verdict causeInfringement Action
BasisConsent Judgment
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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 357 days

357 days — faster than the median ANDA patent case in Delaware, which typically exceeds 2 years through trial

Case timeline: Complaint filed JUL 6 2023, DEC–JAN — 357 days total Horizontal timeline showing the three key events in Actelion Pharmaceuticals US, Inc. v MSN Laboratories Private, Ltd. from filing to resolution. Source: PACER, Delaware District Court. JUL 6 2023 Complaint filed Pre-trial proceedings JUN 27 2024 Consent Judgment 357 DAYS TOTAL
Dismissal terms

Consent judgment and permanent injunction: what the order means for both parties

Legal mechanism

Consent judgment means MSN admitted validity and accepted an injunction

A consent judgment is a court-entered order reflecting a negotiated agreement between the parties. Here, MSN stipulated that US8791122B2 and US9284280B2 are both valid and enforceable — a formal legal concession — and accepted a permanent injunction blocking its ANDA product until patent expiry. The court retains jurisdiction to enforce compliance. MSN waived all appeal rights, making this disposition effectively final.

Stipulated validity concession
Patent holder outcome

Plaintiffs secured patent-term protection for Uptravi IV without trial

Actelion and Nippon Shinyaku obtained a permanent injunction covering the full remaining patent life of both asserted patents, including any patent term extensions and exclusivity periods. By securing MSN’s concession on validity and enforceability, the patent holders removed a potential invalidity cloud over the selexipag injection franchise — strengthening their position against any future ANDA filers who might rely on MSN’s prior challenge as a roadmap.

Full patent-term exclusivity retained
Generic challenger outcome

MSN’s ANDA product blocked until patent expiry; no FDA approval pathway open

MSN is enjoined from commercialising its ANDA product for selexipag injection in the United States until both patents expire, including extensions and exclusivity. The validity concession means MSN cannot relitigate invalidity defences in this forum. Claims were dismissed without prejudice — preserving theoretical future standing — but the waiver of appeal rights and injunction create a practical bar to near-term market entry for MSN’s generic version of Uptravi IV.

Injunction through patent expiry
Commercial implications

Selexipag injection market exclusivity reinforced against first ANDA challenger

The consent judgment signals that the selexipag injection patent estate — covering Uptravi IV — is robust enough to deter litigation to conclusion. For other potential ANDA filers, MSN’s validity concession sets a cautionary precedent: these patents have now survived a challenge without any adverse finding. Companies developing generic selexipag injection products should factor the strengthened exclusivity posture into their market entry timelines and FTO assessments.

Strengthened exclusivity for Uptravi IV
Legal analysis based on PACER docket records for case 1:23-cv-00731 and PatSnap Eureka litigation intelligence Search PatSnap Eureka ↗
Parties and representation

Full party and counsel information

RoleNameTypeDetail
PlaintiffActelion Pharmaceuticals US, Inc.CompanyPharmaceutical rights holder — pulmonary arterial hypertension therapies; co-holder of US8791122B2 and US9284280B2Search in Eureka ↗
Co-PlaintiffNippon Shinyaku Co., Ltd.CompanySearch in Eureka ↗
Co-PlaintiffActelion Pharmaceuticals, Ltd.CompanySearch in Eureka ↗
DefendantMSN Laboratories Private, Ltd.CompanyIndian generic pharmaceutical manufacturer and its US subsidiary; filer of ANDA No. 218430 for selexipag injectionSearch in Eureka ↗
Co-DefendantMSN Pharmaceuticals, Inc.CompanySearch in Eureka ↗
Plaintiff counselAndrew Colin MayoAttorneyCounsel for Actelion Pharmaceuticals US, Inc.Search in Eureka ↗
Plaintiff counselJessica M. StauringAttorneyCounsel for Actelion Pharmaceuticals US, Inc.Search in Eureka ↗
Plaintiff counselSteven J. BalickAttorneyCounsel for Actelion Pharmaceuticals US, Inc.Search in Eureka ↗
Plaintiff law firmAshby & Geddes PCLaw FirmRepresenting Actelion Pharmaceuticals US, Inc.Search in Eureka ↗
Defendant counselKenneth L. Dorsney.AttorneyCounsel for MSN Laboratories Private, Ltd.Search in Eureka ↗
Defendant law firmMorris James LLPLaw FirmRepresenting MSN Laboratories Private, Ltd.Search in Eureka ↗
Presiding judgeJudge N/AJudgeDelaware District CourtSearch in Eureka ↗
Official verdict

Official order — verbatim text

“Plaintiffs Actelion Pharmaceuticals US, Inc. and Actelion Pharmaceuticals Ltd (together, "Actelion") and Nippon Shinyaku Co., Ltd. ("Nippon Shinyaku") (collectively, "Plaintiffs") and Defendants MSN Laboratories Private Limited ("MSN Ltd.") and MSN Pharmaceuticals Inc. ("MSN Inc.") (collectively, "Defendants" or "MSN") (collectively, the "Parties"), by their respective undersigned attorneys, hereby stipulate and consent to entry of judgment and injunction in this action as follows: r.~ :Ji IT IS, this ~ day of J ne__ , 2024 HEREBY ORDERED, ADJUDGED AND DECREED that: 1. For purposes of this action only, this Court has jurisdiction over the subject matter of the above action and has personal jurisdiction over the Parties. 2. As used in this Consent Judgment and Order of Permanent Injunction, (i) the term "Patents-in-Suit" means U.S. Patent Nos. 8,791 ,122 and 9,284,280 respectively, which MSN agrees are both valid and enforceable, (ii) the term "MSN’s ANDA Product" means the product described in Abbreviated New Drug Application ("ANDA") No. 218430 ("MSN’s ANDA"), {02029143;vl } Case 1:23-cv-00731-GBW-CJB Document 40 Filed 06/27/24 Page 1 of 3 PageID #: 214 Case 1:23-cv-00731-GBW-CJB Document 39 Filed 06/26/24 Page 2 of 3 PagelD #: 212 namely selexipag for injection 1.8 mg/vial as a generic version of Uptravi® IV as existing on the date of entry of this Consent Judgment, and as amended or supplemented from time to time in the ordinary course of business, (iii) the term "Affiliate" shall mean any entity controlling, controlled by, or under common control with a Party, but only as long as such control continues, where "control" means: (1) the ownership of at least fifty percent (50%) of the equity or beneficial interest of such entity, or the right to vote for or appoint a majority of the board of directors or other governing body of such entity; or (2) the power to directly or indirectly direct or cause t4e direction of the manage_ment and policies of such. entity by any means wha~soever. 3. Unless otherwise authorized by Plaintiffs, MSN, including any of its successors and assigns, is enjoined from making, using, selling or offering to sell in, or importing into, the United States MSN’s ANDA Product, on its own part or through any Affiliate, officer, agent, servant, employee or attorney, or through any person in concert or coordination with MSN or its Affiliates, until and after the expiration of the Patents-in-Suit, including any patent term extensions and/or patent term adjustments and during the period of any associated exclusivity. 4. The Parties agree that jurisdiction and venue for an action to enforce performance under this Consent Judgment and Order of Permanent Injunction, including for a preliminary injunction against the breaching conduct, exists in this District Court, and the Parties hereby waive any and all defenses based on personal jurisdiction and venue. 5. The Parties waive all right to appeal or otherwise move for relief from this Judgment and Order. 6. The Complaint and all remaining claims, counterclaims, or affirmative defenses in the above action are dismissed without prejudice and without costs, disbursements, or attorney fees to any party. {02029143 ;v l } 2 Case 1:23-cv-00731-GBW-CJB Document 40 Filed 06/27/24 Page 2 of 3 PageID #: 215 , • Case 1:23-cv-00731-GBW-CJB Document 39 Filed 06/26/24 Page 3 of 3 PagelD #: 213 7. This Court retains jurisdiction to enforce or supervise performance under this Consent Judgment and Order of Permanent Injunction.”
Source: PACER Docket, Case 1:23-cv-00731, Delaware District Court

The consent judgment’s operative language is unusually precise in its concessions: MSN did not merely agree to be enjoined — it formally stipulated that both patents-in-suit ‘are both valid and enforceable.’ This goes beyond a typical settlement posture and constitutes a record-level admission. The permanent injunction runs through patent expiry including all term extensions, exclusivity periods, and adjustments, providing maximum temporal protection. The court’s retained jurisdiction clause ensures compliance can be enforced without re-filing, while the waiver of appeal rights forecloses any subsequent challenge to the judgment’s terms.

PACER case 1:23-cv-00731 · Public docket record Explore in Eureka ↗
Patent at issue

US8791122B2 & US9284280B2 — selexipag injection formulations for pulmonary arterial hypertension

Publication No.US9284280B2
Application No.US14/160641
Patent details
Productselexipag formulations and methods of use for pulmonary arterial hypertension
Cited in actionJuly 6, 2023

Publication No.US8791122B2
Application No.US13/379531
Patent details
Productselexipag injectable compositions and related pharmaceutical preparations
Cited in actionJuly 6, 2023

US9284280B2 (App. No. 14/160,641) and US8791122B2 (App. No. 13/379,531) together protect selexipag for injection 1.8 mg/vial — the intravenous formulation marketed as Uptravi IV for pulmonary arterial hypertension (PAH). Selexipag is a selective prostacyclin IP receptor agonist, representing a distinct mechanistic class in PAH therapy. The injectable formulation extends the clinical utility of oral selexipag to patients requiring intravenous administration, and the patents likely cover composition, formulation, and potentially method-of-use claims for this specific dosage form.

The selexipag injection patent estate sits at the intersection of a high-value orphan disease market and complex injectable pharmaceutical formulation IP. PAH therapies command premium pricing, and Uptravi IV’s injectable form addresses a critical care population where market exclusivity has outsized commercial value. The fact that MSN — an experienced ANDA filer — declined to contest validity through trial suggests the patent claims are structurally strong. Any company developing a competing selexipag injectable product or biosimilar-adjacent formulation should closely monitor the expiry timeline and any supplementary protection certificate activity in parallel jurisdictions.

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

Should your team run an FTO against US8791122B2 and US9284280B2?

Any pharmaceutical company, contract development and manufacturing organisation (CDMO), or specialty injectable formulation developer working with selexipag — or developing alternative prostacyclin receptor agonists in injectable formats — should conduct a rigorous freedom-to-operate assessment against both patents. MSN’s validity concession in this consent judgment means the patent claims have not been narrowed or invalidated through adversarial proceedings, making the scope of protection more difficult to design around.

PatSnap Eureka’s FTO Search Agent enables R&D and IP teams to map claim scope against both US8791122B2 and US9284280B2, identify expired or distinct family members, and surface prior art that was not before the examiner. Eureka can also monitor for continuation applications and patent term extension filings that could extend the exclusivity runway beyond the base expiry dates — essential intelligence for any company modelling generic or specialty injectable market entry in the selexipag space.

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Related litigation

Similar ANDA patent infringement cases in Delaware: selexipag and PAH therapies

Explore comparable Hatch-Waxman ANDA infringement cases filed in Delaware District Court involving pharmaceutical injection formulation patents and consent judgments.

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Other selexipag ANDA casesPAH therapy patent disputesDelaware consent judgmentsMSN Labs litigation history
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Strategic implications

What this case signals for the pulmonary arterial hypertension IP landscape

MSN’s capitulation at the consent judgment stage carries implications well beyond a single ANDA dispute over selexipag injection.

MSN’s validity concession raises the bar for future selexipag ANDA challengers

When a generic filer formally stipulates to validity and enforceability in a consent judgment, it adds weight to the patent holder’s portfolio. Future ANDA filers cannot cite MSN’s prior challenge as evidence of patent vulnerability — the record now reflects the opposite. Companies considering Paragraph IV certifications against US8791122B2 or US9284280B2 should treat this outcome as a material data point in their litigation risk models.

Swift resolution in Delaware ANDA cases can signal early adverse claim assessment

Consent judgments entered within 357 days of filing — before Markman or trial — typically suggest the defending generic assessed its invalidity or non-infringement case as weak after initial discovery or pre-litigation analysis. For plaintiffs, early consent judgments are cost-efficient enforcement wins. For generic challengers, they highlight the value of rigorous pre-filing patent clearance on complex pharmaceutical injection formulations.

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Frequently asked questions

Actelion v MSN — key questions answered

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Track selexipag and PAH injectable patent exclusivity in real time

Use PatSnap Eureka to monitor patent term extensions, continuation filings, and new ANDA challenges against the selexipag injection estate. Stay ahead of generic market entry windows and enforcement risk.

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