VoltStar Technologies v. Shenzhen STLM: Default Judgment in Charger Patent Case

Case Overview

The Parties

The Patent at Issue

This case centers on **U.S. Reissue Patent No. RE048794E** (application number US16/209373), which covers charger plug technology. A reissue patent is granted by the USPTO to correct errors in an originally issued patent, often broadening or clarifying claims — making enforcement potentially stronger than the original grant.

• • US RE048794E — Charger plug technology for portable devices

Litigation Timeline & Procedural History

Introduction: When Silence Becomes a Legal Verdict

In a case that underscores the growing enforcement risk faced by overseas electronics manufacturers selling into U.S. markets, VoltStar Technologies, Inc. secured a decisive procedural victory against a Chinese charger accessory company — not through trial, but through the defendant’s complete failure to respond.

Filed August 6, 2025, in the U.S. District Court for the Southern District of Florida, VoltStar Technologies, Inc. v. Shenzhen Shi Tian Lan Mu Ju You Xian Gong Si (Case No. 1:25-cv-23530) centers on alleged infringement of U.S. Reissue Patent RE048794E, covering charger plug technology. By January 5, 2026 — just 152 days after filing — the Clerk had entered default against the defendant, and the court ordered VoltStar to proceed toward a default final judgment.

This case is a textbook illustration of how U.S. patent holders are leveraging procedural mechanisms to enforce IP rights against non-appearing foreign defendants, and it carries significant implications for cross-border patent enforcement strategy, in-house IP risk management, and R&D teams operating in the consumer electronics accessory space.

The Verdict & Legal Analysis

The case closed administratively on January 5, 2026, following the Clerk’s Entry of Default against both named defendants. The court’s order directed VoltStar to file a Motion for Default Final Judgment within ten days, supported by affidavits establishing a sum certain for damages and all supplementary documentation required for final relief. Specific damages amounts have not yet been disclosed in the public record.

The court explicitly noted that if the defendant fails to move to set aside the default or respond to the motion, default final judgment may be entered — potentially allowing VoltStar to recover money, property, or other relief from the defendant.

This is an infringement action decided on procedural default rather than merits adjudication. The legal significance lies not in claim construction or validity analysis — no such proceedings occurred — but in the enforcement mechanism itself.

The critical procedural turning point was the Motion for Alternate Service. Under Federal Rule of Civil Procedure 4(f)(3), courts may authorize service by any means not prohibited by international agreement when traditional channels are impractical. For Chinese defendants, direct service by email or publication is frequently permitted where Hague Convention service is unduly slow or uncertain. The court’s swift approval here — within 12 days of filing — enabled the plaintiff to establish a definitive service date and start the answer clock running.

The defendant’s failure to answer by December 9, 2025 left VoltStar no choice but to pursue default. Under Federal Rule of Civil Procedure 55, the Clerk’s entry of default is a precondition to default judgment, and the two-step process (Clerk’s default → judicial default judgment) was followed precisely here.