Toys Patent Infringement Case Dismissed: Shenzhen Zilin Tech. v. Delta-OT Concludes with Stipulated Dismissal

Introduction

A toys patent infringement action filed in the Northern District of Illinois concluded with a stipulated dismissal with prejudice — a resolution that offers instructive lessons for IP professionals navigating multi-defendant Schedule A litigation. In case 1:24-cv-11694, plaintiff Shenzhen Zilin Tech. Co., Ltd. pursued an infringement action against a broad field of defendants, ultimately reaching a joint stipulation to dismiss Delta-OT (Defendant No. 73) with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(ii), with each party bearing its own costs and attorney fees.

Filed on November 14, 2024, and closed on October 24, 2025, the case ran 344 days before the Northern District of Illinois — a jurisdiction increasingly prominent in Schedule A patent litigation involving consumer goods and e-commerce sellers. For patent attorneys, IP managers, and R&D teams operating in the toys and consumer products space, this outcome reflects broader strategic and procedural patterns worth understanding deeply.

Case Overview

The Parties

The Product at Issue

The accused products fell within the toys category. While specific patent numbers were not disclosed in the available case record, the infringement action centered on toy products allegedly sold by Schedule A defendants through e-commerce channels.

Legal Representation

Plaintiff’s Counsel: Attorney Ni Xue of Kemet Law Group represented Shenzhen Zilin Tech. Co., Ltd. Kemet Law Group has a recognizable practice representing Chinese IP holders in U.S. Schedule A patent and trademark litigation.

Defendant’s Counsel: No defendant law firm or attorney of record was identified in the available case data, which is common in Schedule A cases where many defendants fail to appear or retain counsel.

The Court

The case was filed in the U.S. District Court for the Northern District of Illinois, presided over by Chief Judge Thomas M. Durkin — a district court judge known for managing complex commercial litigation efficiently.

Litigation Timeline & Procedural History

The Northern District of Illinois has become a preferred venue for Schedule A patent and IP litigation, partly due to its procedural familiarity with these multi-defendant cases and its established protocols for emergency temporary restraining orders — a common early-stage tactic in this litigation format.

The 344-day duration from filing to closure is consistent with Schedule A cases that resolve through individual defendant stipulations rather than full merits adjudication. In multi-defendant Schedule A actions, it is standard for plaintiffs to resolve claims against specific defendants on a rolling basis, particularly when a defendant engages in settlement negotiations or agrees to dismissal terms.

Chief Judge Thomas M. Durkin presided over this matter. Judge Durkin has a background in complex commercial litigation and has managed numerous high-volume IP dockets within the Northern District.

No specific motions, claim construction hearings, or summary judgment proceedings were identified in the available case record, which is characteristic of Schedule A cases resolved pre-trial or through stipulated dismissal.

The Verdict & Legal Analysis

Outcome

The case against Delta-OT was dismissed with prejudice pursuant to a joint stipulation under Federal Rule of Civil Procedure 41(a)(1)(A)(ii). Critically, each party agreed to bear its own costs and attorney fees — meaning no damages award, no injunctive relief, and no fee-shifting under 35 U.S.C. § 285 (the Patent Act’s exceptional case provision).

A dismissal with prejudice means Shenzhen Zilin Tech. cannot refile the same claims against Delta-OT in any future proceeding. This is a substantive distinction from a dismissal without prejudice, which would preserve the plaintiff’s right to refile.

Specific damages amounts were not disclosed, and no injunctive relief was granted or denied on the merits, as the case resolved through stipulation rather than judicial determination.

Verdict Cause Analysis

The case was categorized as a standard infringement action. Because the matter resolved via stipulated dismissal rather than a contested ruling, there is no published legal reasoning on claim construction, validity, or infringement findings. This is a defining characteristic of Schedule A litigation outcomes — the vast majority resolve through dismissal, default, or confidential settlement, rarely producing substantive legal precedent.

The mutual cost-bearing provision suggests a negotiated resolution. In Schedule A practice, this often indicates one of several scenarios: the defendant demonstrated non-infringement or lack of sales activity, the parties reached an undisclosed commercial resolution, or the plaintiff determined continued prosecution was not cost-effective for this particular defendant.

Legal Significance

Because this case terminated via stipulated dismissal without judicial findings on the merits, its precedential value is limited. No claim construction orders, validity rulings, or infringement analyses were issued. However, the case contributes to the observable pattern of Schedule A litigation outcomes, where large defendant pools are resolved incrementally through individual stipulations.

For practitioners, the application of Rule 41(a)(1)(A)(ii) — requiring both parties’ signatures for stipulated dismissal after an answer or summary judgment motion has been filed — signals that procedural posture had advanced sufficiently to require joint consent, rather than unilateral voluntary dismissal by the plaintiff.

Strategic Takeaways

For Patent Holders:

• Schedule A litigation against e-commerce sellers involves significant defendant management overhead. Rolling stipulated dismissals are expected and should be factored into litigation budgeting.
• Filing with prejudice provisions in stipulations closes the door on future claims — weigh this carefully against potential ongoing infringement.

For Accused Infringers:

• Early engagement with plaintiff’s counsel can produce cost-neutral exits, as demonstrated here.
• Defendants who appear and respond in Schedule A cases often achieve more favorable resolution terms than those who default.

For R&D Teams:

• Consumer product companies operating in the toys sector should maintain robust freedom-to-operate (FTO) analyses, particularly for products distributed through major e-commerce platforms.
• Schedule A litigation targeting online sellers has become a systematic IP enforcement mechanism — supply chain and distribution partners should be aware of this risk vector.

Industry & Competitive Implications

The toys and consumer products sector has seen a marked increase in patent litigation originating from Chinese IP holders asserting rights in U.S. courts against e-commerce sellers. The Schedule A litigation model — targeting multiple online marketplace vendors simultaneously — has become a structured enforcement strategy, particularly in the Northern District of Illinois and other receptive venues.

For companies operating in the toys space, this case underscores several competitive realities:

Marketplace Seller Risk

Any seller distributing third-party toy products through platforms such as Amazon, eBay, or Walmart Marketplace faces potential Schedule A inclusion. Sellers should conduct supplier IP diligence and obtain indemnification provisions in vendor agreements.

Licensing Dynamics

Stipulated dismissals with each party bearing costs may reflect informal licensing resolutions or design-around agreements reached outside formal court proceedings. This signals that the toys patent space has active licensing activity beneath the surface of litigation outcomes.

Cross-Border IP Strategy

Shenzhen Zilin Tech.’s active assertion posture in U.S. courts reflects a broader maturation of Chinese companies’ U.S. IP portfolios. R&D teams should monitor Chinese assignees in USPTO patent databases as a competitive intelligence priority.

For related Schedule A litigation trends, practitioners may reference the Northern District of Illinois Court’s PACER docket system and the USPTO Patent Center for prosecution history and assignee monitoring.

Frequently Asked Questions

What was the outcome of Shenzhen Zilin Tech. v. Delta-OT (Case No. 1:24-cv-11694)?

The case was dismissed with prejudice via joint stipulation under Rule 41(a)(1)(A)(ii), with each party bearing its own costs and attorney fees. No damages or injunctive relief were awarded.

What products were at issue in this toys patent infringement case?

The infringement action involved toy products. Specific patent numbers were not disclosed in the publicly available case record.

What does a dismissal with prejudice mean for future litigation?

A dismissal with prejudice permanently bars the plaintiff from refiling the same claims against the same defendant, providing the defendant with finality on the asserted infringement claims.