There is a quiet but persistent tension in patent litigation involving the ITC: the statute promises efficiency, but the structure invites gamesmanship. Section 1659 is supposed to prevent duplicative litigation by forcing district courts to stand down when the same issues are being litigated at the ITC. But that protection is not automatic—it must be invoked, and it must be invoked quickly.
In Ascendis Pharma A/S v. BioMarin Pharmaceutical Inc., Case No. 26-1026 (Fed. Cir. Mar. 26, 2026), the Federal Circuit confronted a tactic that attempted to soften that rigidity. The maneuver was simple: if a party misses the 30-day deadline to request a mandatory stay, dismiss the case and refile it to restart the clock. The court’s response was equally simple: no.
The decision is less about statutory text in isolation, and more about the limits of procedural engineering. It reflects a broader judicial instinct to police attempts to manufacture litigation advantages through formal resets, particularly where Congress has imposed timing constraints tied to efficiency and coordination.
The Setup: A Familiar ITC/District Court Collision
The underlying dispute follows a now-common pattern. A patent holder initiates a Section 337 investigation at the ITC while related issues are, or soon will be, litigated in district court. The accused infringer, facing the prospect of parallel proceedings, turns to § 1659.
Ascendis filed a declaratory judgment action asserting that its activities fell within the safe harbor of 35 U.S.C. § 271(e)(1). But it did not request a mandatory stay within 30 days. Only later, after litigation dynamics began to shift, particularly the risk of an injunction following FDA approval, did Ascendis attempt to invoke § 1659. By then, the deadline had passed.
The response was procedural rather than substantive: Ascendis voluntarily dismissed its complaint, and filed a near-identical one the same day, explicitly to “avoid any possible dispute” about the timeliness of a stay request. That candid explanation of intent shaped the rest of the opinion.
The Structural Role of § 1659
Before turning to the tactic itself, the Federal Circuit reaffirmed the structural role of § 1659. The statute is not merely a case management tool; it is a coordination mechanism between two adjudicatory systems with overlapping jurisdiction, but different remedies.
The ITC can exclude products from importation, but cannot award damages. District courts can award damages, and injunctions. Without § 1659, parties could be forced to litigate identical issues simultaneously in both forums.
The court’s prior decision in In re Princo Corp. framed the purpose of § 1659 as preventing “separate proceedings on the same issues occurring at the same time.” That purpose carries an implicit timing discipline. A stay delayed is, in many ways, a stay denied.
Charles Gideon Korrell notes that this framing is important because it positions § 1659 as a structural safeguard rather than a discretionary benefit. That perspective informs the court’s unwillingness to tolerate procedural workarounds.
Standing and the Reality of Litigation Risk
The opinion’s threshold discussion of standing is more than a jurisdictional aside. It reflects the court’s sensitivity to how litigation actually unfolds in parallel proceedings.
Ascendis argued that a discretionary stay was insufficient because it could be lifted, particularly if the FDA approved its drug, and BioMarin sought a preliminary injunction. The Federal Circuit agreed, emphasizing that the risk of resumed litigation was not speculative.
The court analogized to Grit Energy Solutions, LLC v. Oren Technologies, LLC, where prior litigation created a sufficiently concrete risk of future enforcement. Here, BioMarin’s stated intent to pursue injunctive relief, combined with the imminent FDA decision, created the necessary immediacy.
This portion of the opinion underscores a practical point: procedural posture matters. A discretionary stay preserves judicial flexibility, but from a litigant’s perspective, that flexibility can translate into uncertainty, and exposure.
The Collateral Order Doctrine as a Safety Valve
The Federal Circuit’s willingness to exercise jurisdiction under the collateral order doctrine is equally notable. Denials of stays are typically not immediately appealable, but § 1659 presents a different scenario.
Relying on Cohen v. Beneficial Industrial Loan Corp., and its own precedent in In re Princo Corp., the court emphasized that the right conferred by § 1659 is the right not to litigate concurrently. Once that right is lost, once litigation proceeds, the harm cannot be undone on appeal.
This reasoning aligns § 1659 with other statutory stay provisions, such as the automatic stay in bankruptcy, where immediate appellate review is often necessary to preserve the statutory scheme.
Charles Gideon Korrell believes this aspect of the decision will have practical consequences. It invites more frequent appellate intervention in disputes over ITC-related stays, potentially shaping district court behavior at the front end.
The Core Holding: No Resetting the Clock
The heart of the opinion lies in its interpretation of the phrase “the district court action is filed.”
Ascendis argued for a literal reading: each newly filed complaint should trigger a new 30-day window. The statute, after all, does not expressly distinguish between original, and refiled, actions.
The Federal Circuit rejected that reading, invoking a familiar interpretive move: statutes operate against a background of common-law principles. One such principle is that parties may not use voluntary dismissal to circumvent procedural rules.
The court drew on three decisions, Russ v. Standard Insurance Co. (9th Cir.), Walton v. Eaton Corp. (3d Cir.), and Cook v. Rocky Mountain Bank Note Co. (10th Cir.), each addressing variations of the same theme: duplicative filings cannot be used to expand procedural rights.
What distinguishes Ascendis is the clarity of the litigant’s intent. The record showed that the dismissal-and-refiling strategy was designed precisely to restart the statutory clock. That made the case an easy vehicle for applying the anti-circumvention principle.
The court therefore treated the original complaint as the relevant “district court action” for purposes of § 1659. The refiled complaint did not create a new window.
Charles Gideon Korrell observes that the court could have resolved the issue purely through textual interpretation, but chose instead to anchor its reasoning in broader procedural norms. That choice signals a willingness to police litigation tactics even where the statutory text leaves room for argument.
Legislative History and the Anti-Abuse Rationale
The Federal Circuit reinforced its interpretation with legislative history, pointing to the House Report accompanying § 1659. The report emphasizes two goals: avoiding abuse, and encouraging prompt adjudication.
Allowing litigants to reset the 30-day clock through dismissal and refiling would undermine both. It would introduce delay, and invite strategic behavior inconsistent with the statute’s purpose.
This is a familiar pattern in Federal Circuit jurisprudence. Where statutory text is ambiguous or incomplete, the court often looks to structural purpose, particularly in areas like ITC practice, where Congress has created overlapping regimes that require coordination.
Mandatory vs. Discretionary Stays Revisited
One of the more subtle aspects of the opinion is its treatment of the district court’s discretionary stay. The Federal Circuit made clear that such a stay does not moot a request for a mandatory stay.
A discretionary stay can be lifted. A mandatory stay cannot. That difference matters because it affects litigation leverage, timing, and exposure to injunctive relief.
Yet the court ultimately treated the district court’s error on this point as harmless, because Ascendis was not entitled to a mandatory stay in any event.
Charles Gideon Korrell notes that this portion of the opinion may influence how district courts approach § 1659 motions going forward. Granting a discretionary stay is not a substitute for resolving whether a mandatory stay is required.
Practical Takeaways
The decision offers several practical lessons.
First, the 30-day deadline in § 1659 is firm. It is not subject to equitable extension, or procedural reset. Parties must make an early, deliberate decision about whether to invoke the statute.
Second, dismissal-and-refiling strategies are unlikely to succeed where they are transparently designed to circumvent statutory requirements. Courts will look beyond form, to function.
Third, the distinction between mandatory, and discretionary, stays remains consequential. Litigants should not assume that a discretionary stay provides equivalent protection.
Fourth, appellate review is available, and may be increasingly utilized, when mandatory stays are denied.
Finally, the decision reinforces a broader theme: coordination mechanisms like § 1659 depend on timely invocation. Once the opportunity is lost, the system reverts to its default state, parallel proceedings, with all the attendant complexity.
Conclusion
Ascendis v. BioMarin is a case about timing, but more fundamentally, it is a case about limits. The Federal Circuit drew a clear boundary around the use of procedural tools to reshape statutory deadlines.
The message is not subtle. Section 1659 offers a powerful protection, but it demands prompt action. Attempts to recreate that opportunity after the fact, no matter how procedurally clever, will not succeed.