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Glossary

What is ITC Section 337 investigation?

A Section 337 investigation is a US International Trade Commission proceeding into unfair import practices, most commonly patent infringement by imported goods.

Last checked 11 October 2026

Also calledSection 337337 investigation

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Why it matters

Section 337 cases can exclude an entire product line from the US market, and the filings name specific manufacturers and importers on the public record.

Sources

Every claim on this page about a statute, an agency instrument or a tariff instrument rests on one of these, and each one is a document you can open. Where a claim could not be checked against a source, it was removed rather than hedged.

  1. Section 337 of the Tariff Act of 1930, 19 U.S.C. § 1337

    The statute itself: unfair methods of competition in the importation of articles, the Commission's investigation power, and the exclusion and cease-and-desist orders it can issue.