Background
Seasonal Specialties sued National Christmas Products for patent infringement involving two patents related to decorative string lights: U.S. Patent Nos. 9,554,437 and 10,080,265. Both patents cover decorative lighting strings having a plurality of bulbs spaced along the string — the type of LED string lights widely used for holiday decorations, events, and architectural lighting.
Following a Markman hearing on February 5, 2026, the court construed nine disputed claim terms from the two patents. One term — “interrupt” — remained contested after post-hearing submissions and received particular attention in the opinion.
The Court’s Holding
Judge Castner issued a comprehensive claim construction order resolving all nine disputed terms. The constructions will govern the infringement and validity analysis going forward. While the specific constructions of each term are detailed in the opinion, the ruling establishes the boundaries of the patent claims as they apply to the accused products.
The construction of “interrupt” was the most heavily litigated term, with both parties submitting supplemental briefing after the hearing. The court’s resolution of this term will be particularly significant for determining whether National Christmas Products’ lighting designs fall within the scope of the asserted claims.
Key Takeaways
- Claim construction sets the battlefield. This Markman order defines the scope of the asserted patent claims and will control the infringement and invalidity analysis at summary judgment or trial.
- Contested terms receive extended briefing. The court’s willingness to accept post-hearing supplemental submissions on the “interrupt” term reflects the practical reality that some claim terms require iterative refinement beyond the Markman hearing itself.
- Consumer products patents remain actively litigated. Despite the relative simplicity of the underlying technology (LED string lights), the patents’ claim language generated nine disputed terms requiring judicial construction.
Why It Matters
This case is part of ongoing patent litigation in the decorative lighting industry, where design and utility patents protect innovations in LED technology, wiring configurations, and light distribution. The claim construction order will shape the remainder of this case and may influence parallel disputes involving similar lighting technologies. For manufacturers and importers of decorative string lights, the constructions adopted here will signal whether their products potentially infringe the asserted claims.