Shenzhen Jisu Technology Wins Default Judgment in Neck Fan Patent Case
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📋 Case Summary
| Case Name | Shenzhen Jisu Technology Co., Ltd. v. Schedule A Defendants |
| Case Number | 1:24-cv-07647 (N.D. Ill.) |
| Court | U.S. District Court for the Northern District of Illinois |
| Duration | Aug 2024 – Jan 2025 5 months |
| Outcome | Plaintiff Win – Default Judgment ($45,537.45/defendant) |
| Patents at Issue | |
| Accused Products | Neck Fans (Bladeless Wearable Fans) |
Case Overview
The Parties
⚖️ Plaintiff
China-based consumer electronics manufacturer with a notable U.S. patent portfolio in personal comfort devices, specifically wearable neck fan technology.
🛡️ Defendant
Individuals, corporations, LLCs, partnerships, and unincorporated associates operating anonymous online storefronts on platforms including Amazon, eBay, Temu, and Walmart.
The Patents at Issue
This landmark case involved four utility patents covering fundamental innovations in bladeless, wearable neck fan technology:
- U.S. Patent No. 11,635,083 B2 — Innovations in bladeless, wearable neck fan technology
- U.S. Patent No. 11,661,947 B2 — Innovations in bladeless, wearable neck fan technology
- U.S. Patent No. 11,719,250 B2 — Innovations in bladeless, wearable neck fan technology
- U.S. Patent No. 11,920,602 B2 — Innovations in bladeless, wearable neck fan technology
Developing similar personal comfort products?
Check if your design or technology might infringe these or related patents.
The Verdict & Legal Analysis
Outcome
Chief Judge Jeremy C. Daniel granted plaintiff’s Motion for Entry of Default and Default Judgment in full, finding all defaulting defendants liable on counts of willful patent infringement, unfair competition, and unjust enrichment. The total award was $45,537.45 per defaulting defendant.
Breakdown of damages awarded per defaulting defendant:
| Reasonable royalty (35 U.S.C. § 284) | $10,000.00 |
| Hypothetical negotiation transaction costs | $5,000.00 |
| Treble damages (additional 2x to base) | $30,000.00 |
| Attorney’s fees (35 U.S.C. § 285) | $537.45 |
| Total per defendant | $45,537.45 |
A permanent injunction was also entered, barring defendants from manufacturing, selling, importing, or distributing any infringing products and directing third-party platforms — Amazon, eBay, Temu, Walmart, PayPal, and Payoneer — to freeze and release restrained funds to plaintiff within 14 calendar days.
Verdict Cause Analysis
The court’s personal jurisdiction finding is legally significant. Judge Daniel established jurisdiction based on defendants’ deliberate targeting of Illinois consumers: maintaining interactive e-commerce storefronts, offering U.S.-bound shipping, and completing actual sales to Illinois residents. Screenshot evidence and product listing data submitted by plaintiff formed the evidentiary foundation.
Because no defendant appeared, the complaint’s allegations — including willfulness — were deemed admitted by default, satisfying the threshold for treble damages under 35 U.S.C. § 284 and exceptional case status under 35 U.S.C. § 285. The attorney’s fees award of $8,599.25 total ($537.45 per defendant) reflects the streamlined nature of the default proceeding.
Legal Significance
This case reinforces several established doctrines in Schedule A patent litigation:
- Email service is legally sufficient for anonymous overseas defendants when marketplace and payment processor notice supplements direct communication.
- Willfulness defaults are routinely awarded where defendants fail to appear, enabling treble damages without separate willfulness litigation.
- Third-party platform compliance obligations are enforceable by court order, with Amazon, eBay, Temu, Walmart, PayPal, and Payoneer all named as obligated parties.
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⚠️ Freedom to Operate (FTO) Analysis
This case highlights critical IP risks in wearable neck fan design. Choose your next step:
📋 Understand This Case’s Impact
Learn about the specific risks and implications from this litigation.
- View all 4 patents and related filings in this technology space
- See which companies are most active in wearable fan patents
- Understand e-commerce enforcement patterns and strategies
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High Risk Area
Bladeless wearable fan technology
4 Utility Patents
Protecting Jisu’s neck fan innovation
E-commerce Enforcement
Effective against anonymous sellers
✅ Key Takeaways
For Patent Attorneys & Litigators
Schedule A default judgment strategy remains highly effective; 160-day resolution is achievable with proper TRO and service protocols.
Search related case law →Four-patent portfolio assertion maximizes per-count damages and strengthens willfulness findings.
Explore precedents →Illinois Northern District continues to be a preferred venue for e-commerce patent enforcement.
Explore court analytics →For IP & R&D Teams
Monitor continuation filings in the Jisu neck fan patent family (App. Nos. 17/717,131; 17/471,178; 17/585,594; 18/134,571).
Track this patent family →Conduct FTO analysis before entering wearable personal comfort device categories in the U.S. market.
Start FTO analysis for my product →E-commerce marketplace listings to U.S. customers establish sufficient contacts for U.S. patent jurisdiction regardless of seller location.
Understand jurisdiction rules →Ready to Strengthen Your Patent Strategy?
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