What happens if the patent owner also files at the ITC?

When the patent owner who already sued you in district court also files a section 337 complaint at the ITC, the campaign becomes dual-track. You now face a damages case and an import-remedy investigation aimed at the same products or supply chain. The ITC track under 19 U.S.C. 1337 is owner pressure: exclusion and cease-and-desist relief on a compressed clock. It is not a second damages trial, and it is not the same thing as an accused-side PTAB petition.

What changes on day one

You need section 337 counsel, not only district counsel. Confirm whether the public notice is a complaint receipt or an instituted investigation. Filing starts preinstitution proceedings under 19 CFR 210.8; under 19 CFR 210.10 the Commission generally decides institution within 30 days, subject to stated exceptions. Once instituted, 19 CFR 210.13 ordinarily gives each respondent 20 days from service of the complaint and notice of investigation to respond, with shorter timing if temporary relief is in play. Calendar that deadline immediately. Preserve import and product evidence. Map which SKUs enter the United States. Coordinate with manufacturers, affiliates, and customers who may also be named, because after Kyocera Wireless Corp. v. ITC, 545 F.3d 1340 (Fed. Cir. 2008), LEO reach against downstream parties usually requires that they be respondents.

Can one forum freeze the other?

Not automatically, and not symmetrically. A district stay pending IPR does not control the ITC. But under 28 U.S.C. 1659, if you are a district defendant and an ITC respondent, you can obtain a mandatory stay of district claims involving the same issues until the Commission determination becomes final, if you request it in time (generally within 30 days after being named as a respondent, or after the district action is filed, whichever is later). Missing that window can leave both cases running hot. Privilege, experts, claim construction, and prior-art positions should be coordinated so the forums do not produce conflicting stories.

Response duties and default

The 210.13 response must admit, deny, or explain each allegation, and must include available import statistics and the other content the rule requires. Allegations not answered may be deemed admitted. Under 19 U.S.C. 1337(g), a properly served respondent who fails to respond or appear, fails to show good cause against default, and faces a request for relief limited solely to that person can see the complaint's facts presumed true and an exclusion or cease-and-desist order issued against that person after public-interest consideration. Default is a real path to an LEO or CDO limited to the missing respondent.

Remedies and domestic industry still matter

Expect the complainant to seek a limited exclusion order, possibly a general exclusion order under 1337(d)(2), and cease-and-desist relief under 1337(f). For LEO vs GEO, Customs enforcement, Presidential/USTR review, and bonding, use the exclusion-order FAQ. Domestic industry remains a complainant-side gate; Lashify, Inc. v. ITC (Fed. Cir. Mar. 5, 2025) addresses which economic investments can count under 1337(a)(3)(B). Public-interest factors can still shape remedy.

Accused-side Patent Office tools stay separate

IPR, PGR, and reexamination remain tools you can consider at the Patent Office. They do not replace an ITC defense, and they do not automatically stay the Commission. Fintiv-style discretionary issues can still interact with the fastest litigation schedule. Treat district, ITC, and Patent Office work as one coordinated file.

What to watch

Watch institution and the Federal Register notice of investigation for named respondents and asserted patents. Watch your 210.13 response deadline and any temporary-relief schedule. Watch the 1659 stay clock in district court. Watch whether the owner adds downstream respondents for LEO reach after Kyocera. Watch domestic-industry and public-interest briefing.

Where should you read next? Start with the ITC complaint FAQ for respondent mechanics, the dual-track breakout for campaign structure, and the exclusion-order FAQ for remedy detail. For accused-side Office options, see the PTAB FAQ. Outside this site, read 19 U.S.C. 1337, 28 U.S.C. 1659, and 19 CFR 210.8, 210.10, and 210.13.