The U.S. International Trade Commission instituted Investigation No. 337-TA-1494 on March 25, 2026, targeting Tunnel Oxide Passivated Contact (TOPCon) solar cells, modules, panels, and products containing them for alleged patent infringement. First Solar, Inc. filed the underlying complaint on February 24, 2026, claiming infringement of claims 1, 2, 4, and 8 of U.S. Patent No. 9,130,074.

The investigation scope explicitly covers "TOPCon solar cells, as well as solar modules and solar panels that include TOPCon solar cells" — a definition that compliance engineering teams must incorporate into product screening logic. Any import classification workflow handling solar equipment under HTS Chapter 85 subheadings for photovoltaic cells and modules should flag these specific product types pending investigation outcome.

Accused Products Definition: Per 19 CFR 210.10(b)(1), the plain language scope includes TOPCon solar cells and any solar modules or panels incorporating TOPCon technology. This technology-specific definition means classification systems cannot rely solely on HTS codes — product specifications must be evaluated.

First Solar requests either a general exclusion order or, alternatively, a limited exclusion order combined with cease and desist orders. A general exclusion order under 19 U.S.C. 1337 would block all TOPCon solar products meeting the accused product definition from U.S. entry, regardless of manufacturer. Limited exclusion orders would target specific named respondents, including AXITEC, LLC (Radnor, PA) and AXITEC Energy GmbH & Co. KG (Germany).

Compliance System Impact: If the ITC issues exclusion orders following this investigation, CBP will enforce import blocks at the border. Trade compliance platforms must be prepared to update denied party screening and product-level flags. Rate caching systems should include metadata fields for pending Section 337 investigations affecting specific product categories.

The legal authority for this investigation derives from Section 337 of the Tariff Act of 1930, as amended (19 U.S.C. 1337), and the Commission's Rules of Practice and Procedure at 19 CFR 210.10 (2025). The administrative law judge will also gather evidence on public interest factors specified in 19 U.S.C. 1337(d)(1), (f)(1), and (g)(1), which could influence final remedy decisions.

For teams maintaining HTS classification APIs, this investigation creates a monitoring requirement. TOPCon technology represents a growing segment of imported solar equipment, and any exclusion order would immediately impact clearance workflows. Engineering teams should implement investigation-status tracking for products falling under solar cell and module classifications, with alert mechanisms tied to Federal Register publications for this docket.

TradeFacts.io tracks these changes nightly. Start a free 30-day trial.