A federal judge has issued a significant procedural ruling in the ongoing patent dispute between Signify and ETI Solid State Lighting. The decision forces Signify to revise its infringement claims, while delaying key discovery obligations for ETI.
The ruling, issued 22 April 2026 by the U.S. District Court for the Northern District of Georgia, centers on whether Signify provided enough detail in its initial infringement contentions. The court stopped short of dismissing those claims—but made clear they need improvement.
Court: More Detail Required from Signify
At the heart of the dispute is how specifically Signify identified allegedly infringing ETI products. Signify relied on what’s known as “representative charting,” grouping similar products together rather than analyzing each one individually.
The court confirmed that this approach is allowed. However, it emphasized that simply listing products is not enough. Signify must clearly explain how those products infringe on each patent claim.
Judge Richard W. Story noted that the current filings made it “almost impossible” to evaluate whether Signify met the required standard, largely because the full infringement contentions were not provided to the court.
As a result, Signify has been ordered to amend its infringement contentions by 26 May 2026.
Discovery Delayed—For Now
The ruling also impacts discovery. Signify had pushed to compel ETI to produce technical documents, including specifications and design materials for the accused products. ETI resisted, arguing that Signify’s claims were too vague to justify that level of disclosure.
The court largely sided with ETI on timing. It ruled that ETI’s obligation to provide detailed technical documentation will not begin until after Signify submits revised, more specific infringement claims.
Once those are filed, ETI will have 30 days to respond.
Third-Party Documents Remain Out of Reach
Another key issue involved technical documents held by third-party manufacturers. ETI stated it does not manufacture the accused products and does not control the requested materials. The court accepted that position and denied Signify’s request to probe ETI’s access to those documents.
Instead, Signify must pursue that information directly through third-party subpoenas.
Why This Matters
While procedural, the ruling carries real weight. Patent cases often hinge on early-stage disclosures like infringement contentions. These filings shape the scope of discovery and, ultimately, the strength of each side’s case.
The court’s message is clear: quantity does not replace clarity. Even extensive filings—Signify submitted more than 660 pages—must clearly map alleged infringement to specific product features.
As product lines expand and technologies converge, the burden to precisely define infringement is increasing.
The next move now belongs to Signify.
Signify_North_America_Corporation_v_ETI_Solid_State_Lighting_Inc__gandce-25-00121__0096.0