Section 337: How US Import Bans Put Chinese Companies and Global Supply Chains at Risk

A Border Remedy With Far Reaching Business Costs

More than 40 percent of Section 337 investigations completed in 2024 involved a Chinese company, according to US International Trade Commission data. As of October 10, 2025, new investigations into smart televisions and mobile devices continue to expose Chinese manufacturers to a remedy that can reshape their businesses: an order blocking products from entering the United States.

The US International Trade Commission (USITC), an independent federal agency, investigates intellectual property disputes and other unfair acts involving imported goods. Unlike a federal court hearing a patent lawsuit, it cannot award money damages. Its power lies at the border, where an exclusion order can cut off access to the US market.

Electronics manufacturers, energy equipment suppliers and consumer goods businesses face consequences even before a final ruling. The prospect of an import ban changes decisions about product launches, inventories, suppliers and settlements. For Beijing and Chinese industry, the combination of fast proceedings and broad remedies has become a pressing concern.

Average case duration has been under two years in recent periods. Companies often measure the timetable in quarters rather than years, while global supply chains depend on goods arriving just when they are needed. An investigation can therefore force businesses to prepare replacement products and supply arrangements while defending the case.

Complex products assembled from components sourced across Asia, North America and Europe extend the stakes beyond the named manufacturers. An exclusion order can affect repair channels, replacement parts and service programs in the United States. Section 337 has consequently become a measure of technology competition, trade policy and the security of supply in key industries.

What the Law Covers and What Complainants Must Show

Section 337 of the Tariff Act of 1930 targets "unfair methods of competition" and "unfair acts" involving imports into the United States. Most investigations concern allegations that imported products infringe patents, meaning that they use an invention protected by a patent without permission.

The law also covers trademark and copyright violations, the misappropriation of trade secrets connected to imported goods, and certain false advertising claims. Trade secrets are confidential business information, such as manufacturing methods, that a company seeks to keep from competitors.

The Commission has clarified boundaries where claims overlap with the responsibilities of other agencies. When appropriate, it defers to regulators such as the Food and Drug Administration or US Customs and Border Protection.

Complainants seeking relief must prove that a domestic industry exists or is being established. In intellectual property cases, that showing has technical and economic parts. The technical part asks whether the complainant's product practices at least one claim of the asserted intellectual property. A patent claim describes the invention for which legal protection is sought.

The economic part requires evidence of significant investment in plant and equipment, significant employment of labor or capital, or substantial investment in exploiting the intellectual property through research and development, engineering or licensing. Recent decisions scrutinize which activities qualify, with continuing debate over the weight given to engineering and support work serving customers.

This requirement connects the requested border protection to activity in the United States. It also helps explain why disputes can turn on investment records and engineering work as well as the technology inside an accused product.

How an Investigation Moves From Complaint to Decision

A complainant starts the process by filing allegations at the USITC. If the Commission votes to institute an investigation, it publishes a notice naming the respondents and assigns the case to an administrative law judge (ALJ).

The judge sets a fast schedule for discovery, the exchange of evidence between the parties, and an evidentiary hearing. Patent cases also include claim construction, the process of deciding what the patent's claims mean. Those meanings help determine whether the accused product falls within the patent's protection.

The Office of Unfair Import Investigations (OUII), a unit within the Commission, often participates to represent the public interest and provide independent views on legal and technical questions. Its participation adds another voice alongside the complainant and respondents.

The main procedural milestones are:

• At the start: The Commission votes on whether to institute an investigation and names the respondents.
• Within 45 days: The Commission sets a target date for completion.
• During the proceedings: The ALJ oversees discovery and a hearing resembling a trial, then issues an initial determination on whether a violation occurred.
• Within the first 100 days in some cases: Early disposition procedures can resolve threshold issues.
• After the initial determination: Parties may petition for Commission review. The Commission can affirm, modify or reverse the judge's ruling.
• After an exclusion order is issued: A presidential policy review period lasts 60 days.

The full process typically takes well under two years, although some categories move faster through early disposition. This pace makes preparation urgent for respondents that need to collect technical records, coordinate suppliers and develop alternatives while the investigation proceeds.

What an Import Ban Can Reach

A finding of a violation can lead to a limited exclusion order covering infringing products from named respondents. A general exclusion order reaches infringing goods regardless of their source. General orders are less common and generally require a showing that a limited order would be ineffective because of widespread circumvention.

Cease and desist orders address a different part of the supply chain: goods already imported into the United States. They can limit distribution of existing inventory. Together, these remedies attract complainants that value speed and control over market access, even while related litigation continues in federal district courts or before the Patent Trial and Appeal Board (PTAB).

The Commission must weigh public interest factors before granting relief. These include public health and welfare, competitive conditions in the US economy, US production of similar or directly competing products, and the effects on US consumers.

Exclusion orders take effect when issued and become final after the presidential policy review, carried out by the US Trade Representative. US Customs and Border Protection enforces them at the border.

Importers can seek Customs rulings on whether redesigned products fall outside an order's scope. The Commission can also provide guidance about redesigned goods or products that were not accused in the investigation. Proceedings after a case ends offer further routes to challenge or clarify continuing obligations under a remedy.

For manufacturers, redesigning a product means changing it to avoid the disputed intellectual property while preserving its usefulness. Whether that change is enough can become a practical question for Customs, the Commission and businesses trying to keep goods moving.

Why Chinese Companies Appear So Often

China's position as a major exporter of electronics, telecommunications equipment and components places its companies in industries that generate many Section 337 disputes. Chinese brands expanding direct sales in the United States face greater exposure, as do factories supplying more subsystems to US companies.

Chinese legal and policy voices offer different interpretations. Some see the pattern as a consequence of China's central role in global manufacturing: more trade brings more friction. Others regard the ITC system as a barrier that competitors can use to exert pressure.

Yu Guofu, director of Beijing Shengfeng law firm, has urged Chinese businesses to treat the forum as a system governed by rules rather than one aimed at a single country. His advice is to learn how to use the process to protect their interests:

All Chinese company have to do now is not to respond or moan about the injustice of system design, but to actively use the system to safeguard their lawful right.

Ma Zhiguo of the IP Research Center of Xi'an Jiaotong University has taken a tougher view, describing multinationals' use of Section 337 as a trade battle anchored in intellectual property. His position reflects frustration that exclusion orders can restrict competition and slow industrial upgrading by keeping products outside the US market.

Chinese institutions have also compiled statistics from earlier years showing higher loss rates for Chinese respondents than the global average. That older sample helps explain why many companies now invest in earlier compliance reviews, freedom to operate analysis and plans for redesigning products before launching them in US sales channels. Freedom to operate analysis examines whether a planned product may conflict with another company's intellectual property rights.

Smart Television and Mobile Device Cases Expand the Docket

In September 2025, the USITC launched investigation 337-TA-1461 into certain smart televisions following a complaint by Cerence Operating Company. The respondents include Sony entities and numerous TCL affiliates across China, Hong Kong, Mexico, Vietnam and the United States.

Cerence seeks a limited exclusion order and cease and desist orders. The investigation is before an ALJ for an evidentiary hearing and an initial determination, putting a network of companies across several manufacturing and sales locations into the same proceeding.

The USITC, the agency deciding whether to launch and ultimately resolve such investigations, states its position at the opening stage in its notices:

The USITC has not made any decision on the merits of the case.

In August 2025, the Commission also instituted an investigation into mobile cellular communications devices after a complaint by Pantech Corporation. The respondents include HMD entities, Lenovo and Motorola units, OnePlus affiliates, TCL affiliates and Tinno.

Pantech seeks an exclusion order that would block accused devices if a violation is found. A final remedy would follow the hearing process, Commission review and the 60 day presidential policy review. Both investigations remain at the stage of allegations and proceedings as of October 10.

OLED Disputes Show Why Legal Grounds Matter

Display technology disputes involve different kinds of intellectual property claims. One prominent proceeding concerns allegations that a Chinese panel maker misappropriated manufacturing trade secrets for organic light emitting diode (OLED) displays.

OUII staff recommended exclusion in a 2024 brief in that dispute. Staff recommendations can influence the Commission's deliberations, while the Commission makes the decision on relief.

A separate OLED patent case brought by Samsung Display against BOE concluded in 2025 without an import ban. The two proceedings show how outcomes can vary with the evidence, the domestic industry showing and the public interest analysis.

The legal grounds also shape what businesses must defend. A patent dispute centers on protected inventions and the accused products, while a trade secret dispute concerns confidential information and alleged misuse. For display manufacturers and their customers, either route can bring potential disruption to the supply of components.

Solar Technology Brings Energy Suppliers Into the Same Forum

In late 2024, the Commission voted to investigate whether solar cells and modules tied to Runergy and Adani infringe Trina Solar's patents for tunnel oxide passivated contact (TOPCon) technology. TOPCon is the solar cell technology at the center of the patent allegations.

Trina sought a limited exclusion order and cease and desist orders covering the accused cells, modules and downstream products containing the technology. The requested relief shows how a dispute over a component can reach finished products incorporating it.

The solar investigation also illustrates how companies from the same exporting country can appear on opposite sides of a US dispute. Section 337 provides a route for a company seeking protection as well as a risk for a company accused of infringement.

US manufacturing investments are part of that picture. Trina has announced manufacturing in Texas, while Runergy is building a facility in Alabama. As foreign companies add US capacity, domestic industry arguments will evolve because the economic requirement examines US investment and activity tied to the asserted intellectual property.

Other recent complaints have targeted specialized components such as liquid crystal display (LCD) glass substrates. These materials sit upstream of finished televisions and panels, allowing a supplier's patent dispute to create risk farther along the production chain.

Manufacturers consequently need contracts addressing indemnities, responsibility for redesigns and cooperation in an ITC defense. An indemnity sets out responsibility for specified losses or costs. These arrangements become valuable when one component dispute affects an entire group of products and suppliers.

Washington Debates Domestic Industry and Public Interest Rules

Lawmakers have floated changes through proposals such as the Advancing Americas Interests Act. The proposals seek to sharpen the domestic industry requirement and require more rigorous public interest analysis before exclusion orders are issued.

Supporters argue that changes would reserve the ITC for disputes that genuinely protect US industry and consumers, while discouraging complainants that do not actively use the asserted intellectual property in the US market. The proposals remain part of the reform debate rather than changes described as already in force.

Policy advocates have also called for limits on perceived misuse by patent assertion entities, businesses that assert patent rights against others. Critics say the threat of excluding a complex product over a patent covering a small feature can create settlement pressure disconnected from the invention's value.

Proposals include ending the practice called domestic industry by subpoena and requiring a stronger connection between the asserted intellectual property and a domestic industry seeking border relief. The debate concerns whose US activities should support a request to block imports.

Practitioners are also watching changes in Commission composition, constitutional challenges to ALJ appointments and evolving early disposition rules. These developments could affect the speed of proceedings and which cases the ITC accepts.

Parallel disputes add another layer. Counsel monitor district court litigation and PTAB proceedings because the statute sets rules for stays, which pause proceedings, and for how the Commission weighs PTAB outcomes. A company's response may therefore require coordination across several forums.

How Companies Respond and What Markets Reflect

Research on Chinese technology companies finds that share prices tend to fall when a new Section 337 investigation is announced. Longer term outcomes are more mixed, depending on how companies respond to the dispute and adjust their businesses.

Companies pursuing concrete strategies, including greater research and development spending, sales diversification across markets and targeted policy support, often recover and sometimes create more durable value. Firms that fail to adapt tend to underperform.

The studies also suggest that state owned enterprises lag private firms in their strategic responses. Companies without venture capital backing may be less agile than those with that support. These findings help explain why an investigation can produce different business outcomes even among firms facing similar legal risks.

Chinese businesses have developed practical responses that begin before a US launch. Patent landscaping maps relevant intellectual property, while freedom to operate reviews identify possible conflicts. Manufacturers increasingly prepare redesign options that can be put into use quickly if an unfavorable claim construction ruling changes their position.

Companies also arrange US supplies for service and repair to reduce potential disruption from cease and desist orders. Some invest in US facilities connected to their core intellectual property, strengthening the domestic industry showing when they become complainants themselves.

Chinese legal experts advocate early warning mechanisms for patent conflicts in export industries, training for internal legal teams on ITC procedure, and coordination between companies and industry groups on public interest arguments. When disputes escalate, businesses consider parallel challenges to asserted patents at the US Patent and Trademark Office and cooperate with US importers on Customs rulings for redesigned goods.

The response requires coordination across borders, from engineering teams and component suppliers to lawyers and importers. For companies dependent on US sales, the immediate task is to defend the investigation while preparing products and supply arrangements that can withstand a possible border restriction.

The Bottom Line

• Section 337 allows the USITC to block imports connected to patent infringement, trade secret misappropriation and other unfair acts. It does not award money damages.
• More than 40 percent of investigations completed in 2024 involved a Chinese company.
• Complainants must establish a domestic industry through the required technical and economic showing.
• Limited and general exclusion orders target imports, while cease and desist orders can restrict distribution of existing US inventory.
• Exclusion orders undergo a 60 day presidential policy review and are enforced by US Customs and Border Protection.
• As of October 10, 2025, recent disputes cover smart televisions, mobile devices, OLED displays, solar technology and specialized components.
• Reform proposals seek tighter domestic industry standards and closer scrutiny of public interest effects.
• Chinese companies are responding through research investment, patent reviews, product redesigns, market diversification and coordination with US partners.