ITC Section 337 Patent Investigations: How Exclusion Orders Can Block Imports
An exclusion order from the U.S. International Trade Commission can stop infringing products at the border. That makes a Section 337 investigation a distinct—and often commercially powerful—form of patent enforcement for companies whose competitors manufacture abroad or import accused products into the United States.
A new investigation illustrates the point. On September 21, 2026, the Commission instituted Certain Wearable Breast Pumps, Associated Milk Storage Containers, and Components Thereof, Investigation No. 337-TA-1522. The September 24 Federal Register notice identifies five asserted utility and design patents and respondents in the United States and Asia. The complainants, Willow Innovations, Inc. and Willow Blossom HoldCo Ltd., seek a limited exclusion order and cease-and-desist orders.
Institution is not a finding of infringement. The allegations now move into an adjudicatory process. But the proceeding is a useful reminder that an IP dispute involving imported products may present a forum choice that does not exist in a purely domestic case.
What Section 337 adds to patent enforcement
Section 337 of the Tariff Act, 19 U.S.C. § 1337, prohibits certain unfair acts involving imported articles. Among them is the importation, sale for importation, or sale after importation of articles that infringe a valid and enforceable U.S. patent, registered trademark, copyright, or mask work when the statute’s domestic-industry requirement is satisfied.
The Commission is not a federal district court, and a Section 337 investigation is not simply a faster patent lawsuit under a different caption. The remedies, procedures, parties, and strategic pressures differ. The ITC does not award compensatory damages for past infringement. Its principal patent remedies are exclusion orders, which direct U.S. Customs and Border Protection to block covered imports, and cease-and-desist orders, which constrain specified domestic commercial activity involving covered articles.
A patent owner may therefore use the ITC to pursue forward-looking relief while separately pursuing damages in district court. Whether parallel proceedings make sense depends on the import chain, the accused products, the available domestic industry, the defendants, and the business objective. Tucker Law’s patent litigation practice addresses the broader enforcement and defense issues that should be evaluated with that forum decision.
The three questions at the threshold
A patent-based Section 337 theory generally puts three threshold subjects in focus.
Is there a qualifying importation or sale?
The Commission’s jurisdiction is tied to imported articles. A complainant should identify the accused products, how they enter the United States, who imports or sells them, and which entities in the supply chain should be named. Records concerning customs entry, purchase orders, distributors, online marketplaces, and U.S. inventory can matter early.
For a prospective respondent, the first review should map the same chain. Corporate names, manufacturers, brand owners, importers of record, fulfillment providers, and domestic sellers may not be interchangeable. An incomplete map can cause missed deadlines or leave critical evidence with an overseas affiliate.
Do the imported articles infringe an enforceable U.S. patent?
The Commission adjudicates infringement and patent defenses. Claim construction, noninfringement, invalidity, enforceability, and expert proof may all be central. The analysis is patent- and product-specific, just as it is in district court. The guide to patent claim construction explains why the meaning of even one claim term can reshape the case.
The new wearable-pump investigation is notable because the notice identifies both utility and design patents. Utility-patent infringement turns on the limitations of the asserted claims. Design-patent infringement instead focuses on the claimed ornamental design from the perspective of an ordinary observer, with the drawings defining the claim. Businesses developing products with important visual features should consider both forms of protection; Tucker Law’s overview of design patent law explains the distinction.
Is there a domestic industry?
For the statutory IP claims, the complainant must establish an industry in the United States relating to articles protected by the asserted right, or show that such an industry is in the process of being established. In patent investigations, this often involves two related showings.
The “technical prong” commonly asks whether a domestic-industry product practices at least one claim of the asserted patent. The “economic prong” asks whether qualifying domestic activity meets the statute. Section 337 identifies significant investment in plant and equipment; significant employment of labor or capital; or substantial investment in exploitation of the right, including engineering, research and development, or licensing.
The requirement is evidence-driven. A complainant should connect particular U.S. expenditures and activities to the protected articles or asserted rights rather than relying on company-wide totals alone. A respondent should test both the claimed technical relationship and the allocation, significance, and statutory character of the asserted investments.
How an ITC patent investigation moves
The Commission’s Section 337 overview describes a trial-type proceeding under the Administrative Procedure Act. Although each investigation has its own procedural schedule, the sequence generally looks like this:
- Complaint and institution. A patent owner files a detailed complaint. If the Commission institutes an investigation, the Federal Register notice identifies its scope and the named respondents.
- Response and case schedule. Respondents must answer quickly. In Investigation No. 337-TA-1522, the notice requires responses within 20 days after service of the complaint and notice—not 20 days after Federal Register publication. The presiding administrative law judge then establishes procedural deadlines, while the Commission sets a target date for completion.
- Discovery and claim construction. The parties develop technical, financial, importation, and domestic-industry evidence. Claim construction may be addressed through briefing and a hearing or within the merits process, depending on the assigned procedures.
- Evidentiary hearing and initial determination. An administrative law judge conducts a hearing and issues an initial determination on violation. Recommended determinations may address remedy, bonding, and public-interest issues.
- Commission review and relief. The Commission may review the initial determination. If it finds a violation, it decides whether and what relief should issue, subject to statutory public-interest considerations.
- Presidential review and appeal. Remedial orders enter a 60-day Presidential review period, delegated in practice to the U.S. Trade Representative. A party adversely affected by a final Commission determination may appeal to the U.S. Court of Appeals for the Federal Circuit.
The pace changes litigation behavior. Preservation, technical source material, product samples, witness availability, translations, and domestic-industry accounting cannot wait for a leisurely discovery calendar. A respondent that fails to answer or defend can face default findings and requested relief.
Exclusion orders and cease-and-desist orders are different tools
A limited exclusion order generally bars covered articles imported by or for the named respondents. A general exclusion order can reach covered articles beyond the named respondents, but only when the additional statutory requirements are met. The Willow complainants requested a limited order, according to the institution notice.
Exclusion orders are enforced at the border by U.S. Customs and Border Protection. That enforcement setting makes product identification important. The patent analysis may be sophisticated, but an order also must be administered against real shipments, models, components, and documentation.
A cease-and-desist order operates domestically. It can restrict a respondent’s sale, marketing, distribution, or other commercial handling of covered inventory already in the United States. The Commission maintains a public collection of outstanding exclusion and cease-and-desist orders, which can help businesses evaluate import and distribution risk.
These remedies explain why a company should not evaluate Section 337 exposure solely by comparing potential damages to defense costs. The central risk may be interruption of U.S. supply, inventory, launch plans, retailer relationships, or replacement-parts sales.
Strategy for a potential complainant
The best time to test a Section 337 case is before filing. A complainant should assess claim coverage, infringement proof, likely validity challenges, importation evidence, domestic-industry proof, respondent identities, and the practical scope of an enforceable order. It also should identify the public-interest and downstream effects that respondents or third parties may raise.
Portfolio work matters well before a dispute. Clear claim drafting, continuation strategy, assignments, and prosecution records can influence future enforcement choices. Tucker Law’s patent application practice and patent licensing guidance address two parts of that foundation.
A complainant also should decide what success looks like. An exclusion order may be the objective, but investigations can intersect with settlement, licensing, design-around analysis, district-court claims, post-grant challenges, and commercial negotiations. Those paths should be coordinated from the outset.
Immediate priorities for a named respondent
A company served with a complaint should treat the response deadline as an operational deadline, not merely a pleading date. It should preserve relevant records, assemble U.S. and foreign personnel, identify products and import flows, retain technical materials, and determine whether suppliers or customers have defense or indemnity obligations.
The legal review should cover noninfringement, invalidity, enforceability, importation, domestic industry, remedy, and public interest. At the same time, the business team should evaluate alternative sourcing, inventory, product modifications, Customs classification and identification issues, and communications with channel partners. A technically sound defense is stronger when it is integrated with a realistic supply-chain plan.
Respondents should also evaluate related proceedings without assuming that one forum will automatically resolve another. District-court litigation, Patent Trial and Appeal Board proceedings, Customs questions, and settlement talks have different standards, deadlines, and remedies. Experienced IP local counsel can help national teams coordinate Florida proceedings that run alongside an ITC dispute.
The practical takeaway
Section 337 is most relevant when U.S. patent rights, imported products, and a qualifying domestic industry converge. It offers no damages award, but the ability to stop covered imports can make it a powerful enforcement forum. That same feature makes a new complaint an immediate business risk for respondents.
The wearable breast-pump investigation will now test the complainants’ allegations; institution alone decides none of them. Its broader lesson is already clear: patent owners should build domestic-industry and importation evidence before filing, and importers should prepare a legal and supply-chain response as soon as service occurs.
If your company is evaluating imported products, an ITC complaint, or a coordinated patent-enforcement strategy, contact Tucker Law to discuss the patents, products, domestic operations, and business objectives involved.
