What is Section 337 and why does domestic industry matter
Section 337 of the Tariff Act of 1930 (19 U.S.C. § 1337) gives the US International Trade Commission (ITC) authority to investigate and exclude imported products that infringe US intellectual property rights, including patents, trademarks, trade secrets, and copyrights. Unlike district courts (which award monetary damages), the ITC can issue exclusion orders that block infringing goods at the US border and cease-and-desist orders against specific US importers and distributors. The domestic industry requirement is a threshold standing requirement for patent-based Section 337 investigations. Congress imposed it to ensure that the ITC's import-restriction power protects existing or nascent US industries — not merely patent holders who have no US business activities related to the patent.
The two-prong domestic industry test
The domestic industry test has two prongs that both must be established by a preponderance of the evidence. The technical prong requires that the complainant have articles that practice at least one claim of the asserted patent, and those articles must be in the United States — either manufactured here, sold here, or used in domestic operations here. The economic prong requires significant domestic investment in connection with those articles, measured by one of three alternative statutory categories: (A) significant investment in US plant and equipment; (B) significant employment of US labor or capital; or (C) substantial investment in exploiting the patent, including engineering, research and development, or licensing. A complainant need only satisfy one of the three economic prong categories, but must satisfy both the technical and economic prongs to establish domestic industry.
Technical prong: practicing the patent claims domestically
The technical prong is a patent-claim-practicing analysis. The complainant's US articles must practice at least one claim of the patent in suit — ideally, the same claims asserted against the accused imported products. The domestic articles can be: the complainant's own products made or used in the US; products of licensees sold in the US (19 U.S.C. § 1337(a)(3)(C) — licensing prong); or products that the complainant uses in its US operations. The technical prong analysis follows the same claim-by-element methodology as a patent infringement analysis — the complainant presents claim charts showing that each element of the relevant claims is present in the domestic articles. A domestic article that practices a subset of the asserted claims is sufficient, as long as at least one asserted claim is practiced.
Economic prong: significant US investment
Subpart (A) — plant and equipment: manufacturing facilities, machinery, tooling, and physical infrastructure in the US used to produce the domestic industry articles. Companies with US manufacturing operations almost always satisfy this prong if the manufacturing activities are significant relative to the patent's value. Subpart (B) — labor and capital: employee headcount, salary costs, and capital deployed in US operations related to the domestic industry articles. A US-based engineering team that develops and supports the patented technology typically satisfies this prong. Subpart (C) — exploitation, including licensing: engineering investment, R&D programs, and licensing activities in the US devoted to the patented technology. The ITC has accepted significant licensing program investments — legal fees, licensing staff, technical resources for claim charting — as satisfying subpart (C) for NPE and licensing-focused complainants, though the investment must be 'substantial.'
The licensing economic prong for NPEs
The licensing-based economic prong (subpart C) is the primary basis for non-practicing entities and IP licensing companies to satisfy the domestic industry requirement. Key factors the ITC considers: the absolute dollar amount invested in licensing activities (staff, legal fees, technical resources) and whether that investment is 'substantial' relative to the technology; whether the investment is ongoing and active (not just passive royalty collection from licenses already completed); the geographic location of the investment (must be US-based); and whether the investment genuinely relates to exploiting the asserted patent. The ITC has recognized that licensing can constitute a legitimate US industry — but draws the line at purely passive royalty collection. Companies that maintain significant US-based licensing departments with active programs fare better than patent holding companies with minimal US operations whose licenses are managed by foreign-domiciled entities.
ITC remedies and domestic industry incentives
Understanding ITC remedies helps explain why domestic industry matters strategically. When the ITC finds a violation of Section 337 and domestic industry is established, available remedies include: (1) limited exclusion order — bars importation of the specific respondents' infringing goods; (2) general exclusion order — bars importation of all infringing goods from any source, regardless of whether the manufacturer was named in the investigation; general exclusion orders require a showing that limited exclusion order would be inadequate; (3) cease-and-desist order — prohibits US importers and distributors from selling, marketing, or distributing already-imported infringing goods. Exclusion orders are enforced by US Customs and Border Protection. The combination of ITC exclusion (blocking imports) and district court litigation (seeking damages and injunction against domestic sales) gives patent owners pursuing foreign manufacturers a powerful two-front enforcement strategy.
Frequently Asked Questions
What is the domestic industry requirement for ITC Section 337 patent cases?
Section 337 of the Tariff Act of 1930 (19 U.S.C. § 1337) authorizes the US International Trade Commission (ITC) to investigate and exclude imported goods that infringe US intellectual property rights. For patent-based Section 337 investigations, the complainant must prove that 'a domestic industry in the United States, relating to the articles protected by the patent, exists or is in the process of being established.' The domestic industry requirement has two prongs that both must be satisfied: (1) Technical prong: the complainant must have articles in the United States that practice at least one claim of the asserted patent — the same claims accused of infringement in the imported goods; and (2) Economic prong: the complainant must make significant investments in the United States with respect to those articles. The economic prong is satisfied by showing significant plant and equipment, significant labor or capital, or substantial investment in exploitation of the patent (including licensing). A complainant who cannot satisfy the domestic industry requirement cannot bring a Section 337 case — the ITC would terminate the investigation.
What satisfies the technical prong of domestic industry?
The technical prong requires that the complainant's domestic products practice at least one claim of the patent in suit — specifically, one or more of the claims being asserted against the accused imported products. The domestic articles need not practice every asserted claim, but must practice at least one. The domestic article can be the complainant's own manufactured product, a licensed product sold by a licensee, or even a product that the complainant uses (not sells) in its domestic operations. In the licensing context (§ 337(a)(3)(C)), the technical prong requires that articles covered by the patent are sold in or imported into the United States — the licensee's activities can satisfy the technical prong even if the complainant itself does not manufacture. The technical prong analysis mirrors the infringement analysis: the same claim-by-element mapping used to show infringement by the accused imports is used to show the domestic articles practice the claims.
What satisfies the economic prong of domestic industry?
The economic prong (19 U.S.C. § 1337(a)(3)) is satisfied by significant US investment in any one of three categories: (A) significant investment in plant and equipment — manufacturing facilities, tooling, machinery, and capital equipment used in producing the domestic industry articles; (B) significant employment of labor or capital — employee labor costs, capital expenditures, or working capital deployed in the US in connection with the domestic industry articles; or (C) substantial investment in its exploitation, including engineering, research and development, or licensing. The 'licensing economic prong' under subpart (C) is critically important for non-practicing entities and IP licensing companies. The ITC has held that licensing companies can satisfy the economic prong by showing substantial US investment in licensing activities — including attorney fees for patent enforcement, licensing program management, and related IP licensing infrastructure. However, the ITC scrutinizes NPE domestic industry claims carefully — licensing must constitute 'substantial investment,' not merely holding a patent and collecting royalties.
Can a patent licensing company (NPE) satisfy the domestic industry requirement?
Yes, patent licensing companies and non-practicing entities (NPEs) can satisfy the domestic industry requirement through the 'licensing economic prong' under § 337(a)(3)(C) — 'substantial investment in its exploitation, including... licensing.' The ITC has found domestic industry for NPE complainants based on: investments in licensing department staff and infrastructure; legal fees and costs for patent licensing and enforcement programs; engineering resources devoted to claim charting and technical analysis in support of licensing; and licensing revenue reinvested in the IP program. However, several ITC administrative law judges and the Commission have applied heightened scrutiny to NPE domestic industry claims. Key issues: the investment must be substantial relative to the value of the patent; passive royalty collection from licenses already in place does not satisfy the economic prong; the investment must be 'in the United States'; and investment that is primarily in litigation (rather than licensing) may not qualify. NPE complainants at the ITC typically hire substantial US-based technical and licensing staff to build a credible domestic industry record.
How does the ITC domestic industry requirement differ from district court patent litigation?
District court patent litigation has no domestic industry requirement — any patent owner can sue for infringement in federal district court regardless of whether they have US operations. The domestic industry requirement is unique to ITC Section 337 proceedings and reflects the ITC's statutory mandate to protect US industry from unfair competition involving imported goods. Key differences: (1) ITC complainants must affirmatively prove domestic industry; defendants often challenge it early in the proceeding as a threshold issue; (2) The ITC can exclude goods at the border — a general exclusion order bars all infringing imports from any source, not just named respondents, making it broader than a district court injunction; (3) The ITC does not award monetary damages — the remedies are exclusion orders and cease-and-desist orders, which affect imports but not domestic sales; (4) ITC proceedings are faster than district court — typical 12–18 month timeline from complaint to final determination vs. multi-year district court timelines. Companies often pursue ITC and district court litigation simultaneously for maximum leverage against infringing foreign manufacturers.