The US Court of Appeals for the Federal Circuit affirmed a damages verdict amounting to tens of millions of dollars. The Court found that the patentee’s damages expert correctly apportioned value to the patented feature and rejected challenges to her methodology. Willis Electric Co., Ltd. v. Polygroup Ltd., Case No. 24-2118 (Fed. Cir. Feb. 17, 2026) (Moore, Stark, Oetken, JJ.)
Willis sued Polygroup for infringing its patent related to pre-lit artificial trees with decorative lighting. In response, Polygroup filed multiple inter partes review (IPR) petitions challenging the asserted claims. Following extensive IPR proceedings, only a dependent claim that required coaxial trunk connectors remained for trial.
A jury found the claim infringed and not obvious, and awarded about $42.5 million in damages, equating to a $4-per-tree royalty. Polygroup moved for judgment as a matter of law of obviousness or, alternatively, for a new trial on damages. The district court denied both motions. Polygroup appealed.
Effect of prior IPR ruling
Polygroup argued that because the independent claim from which the asserted claim depended was held unpatentable, damages should be limited to only the incremental value of the coaxial connectors recited in the asserted dependent claim. The Federal Circuit rejected that argument, explaining that the IPR applied the broadest reasonable interpretation standard, while the district court construed the independent claim under the Phillips standard. Under the district court’s construction, the independent claim required forming simultaneous mechanical and electrical connections regardless of rotational orientation, a feature that was not required under the IPR construction. Because the independent claim had not been held unpatentable under the district court’s construction, the Federal Circuit reasoned that the IPR ruling did not preclude Willis from relying on that one-step functionality in calculating the value attributable to the coaxial connectors recited in the dependent claim.
The Federal Circuit emphasized that what value was attributable to the claimed coaxial connectors was a question of fact for the jury. Substantial evidence supported the jury’s finding that the value included rotationally independent, simultaneous connection functionality, not merely the physical presence of coaxial connectors.
Rule 702 and damages methodology
Willis’ damages expert presented two independent apportionment analyses.
Under an income-based approach, the expert compared profit margins for Willis’ “One Plug” trees and Polygroup’s Quick Set trees against comparable noninfringing trees to derive a royalty range. Under a market-based approach, she analyzed several license agreements to establish a reasonable royalty range, which she combined with her income approach to arrive at an expanded reasonable royalty range. She then applied the Georgia-Pacific factors to select a $5-per-tree royalty, resulting in a jury award of $4 per tree.
Polygroup argued that the expert failed to adequately apportion value and relied on non-comparable licenses and improper averaging methods. The Federal Circuit disagreed, emphasizing the district court’s gatekeeping role under Federal Rule of Evidence 702 while reinforcing the distinction between admissibility and weight.
The Federal Circuit explained that reasonable royalty determinations inherently involve approximation and uncertainty. Where an expert’s methodology is grounded in record evidence, including internal sales [...]
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