Noxgear LLC v. Dexscout

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Noxgear, LLC (Ohio)
  • Defendant: Dexscout aka Shenzhenshi Guxiang Zhineng Shebei Youxian Zeren Gongsi (China)
  • Plaintiff's Counsel: Workman Nydegger
• Case Identification: 2:26-cv-00159, D. Utah, 02/25/2026
• Venue Allegations: Venue is asserted on the basis that the Defendant is a foreign entity subject to personal jurisdiction in the district and because the parties transact business in the district, including through Amazon.com.
• Core Dispute: Plaintiff alleges that Defendant's clip-on portable audio speakers infringe a patent related to power management architecture for compact, battery-powered devices.
• Technical Context: The technology concerns electronic design for small, wearable audio devices, focusing on overcoming the power limitations of single-cell lithium batteries to produce high-volume sound efficiently.
• Key Procedural History: The complaint does not mention any prior litigation, licensing history, or post-grant proceedings related to the patent-in-suit.

Case Timeline

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 12,520,081 - "Portable audio speaker system"

• Patent Identification: U.S. Patent No. 12,520,081, "Portable audio speaker system," issued January 6, 2026.

The Invention Explained

• Problem Addressed: Small, wearable speakers powered by a single-cell lithium battery are inherently limited in how much sound they can produce, often resulting in low volume or degraded quality Compl. ¶7 Conventional designs struggle to produce a high sound pressure level (SPL) without requiring excessive battery power, which would increase device size and weight or significantly reduce battery life '081 Patent, col. 3:55-65
• The Patented Solution: The invention is a specific speaker architecture that uses an internal audio amplifier to both boost the battery's voltage and deliver the audio signal using pulse-width modulation (PWM) Compl. ¶8 This combination allows the speaker to operate at a higher output voltage than the battery's native voltage, enabling greater volume from a compact, single-cell powered device '081 Patent, col. 15:9-14 A block diagram in the patent illustrates the amplifier receiving power from a battery cell and incorporating a boost converter and PWM modulator to drive the speaker '081 Patent, Fig. 21
• Technical Importance: This approach addresses a fundamental trade-off between size, power, and performance in portable electronics, enabling small, lightweight devices to deliver audio output comparable to larger systems Compl. ¶¶7-8

Key Claims at a Glance

• The complaint asserts independent claim 15 Compl. ¶17
• The essential elements of independent claim 15 include:
  • A portable audio speaker system with a housing, a speaker element, an audio amplifier, and a single-cell lithium battery.
  • A clip member and a spring element coupled to the housing, forming a clipping device.
  • The audio amplifier provides a switched voltage audio signal via pulse-width modulation (PWM).
  • The audio amplifier includes a boost converter configured to raise the single-cell lithium battery voltage to "about 5 to 6 volts" to drive the speaker.
• The complaint reserves the right to assert additional claims Compl. ¶17

III. The Accused Instrumentality

Product Identification

• The "DexScout speaker product," identified as a "Wearable Bluetooth Speaker, Clip-on Wireless Portable Mini Water-Resistant Player" Compl. ¶2 Compl. p. 5 The complaint identifies multiple Amazon Standard Identification Numbers (ASINs) for the accused products Compl. pp. 5-6

Functionality and Market Context

• The Accused Product is a small, clip-on, battery-powered Bluetooth speaker designed for active and mobile use Compl. p. 5
• The complaint alleges that the Accused Product incorporates a commercially available integrated audio amplifier, the PAM8945, which is fixed in its design Compl. ¶9 Compl. ¶25 The incorporation of this specific component into a speaker powered by a single-cell lithium battery is alleged to necessarily result in a system having the voltage-boosting and PWM signal-delivery features claimed in the patent '081 Patent Compl. ¶39
• The products are marketed and sold in the United States through online marketplaces such as Amazon.com Compl. ¶10 An included screenshot shows a product listing for the "DEXSCOUT" branded speaker on Amazon.com Compl. p. 5

IV. Analysis of Infringement Allegations

'081 Patent Infringement Allegations

• Identified Points of Contention:
  • Scope Questions: The infringement analysis may turn on the construction of the term "about 5 to 6 volts." The complaint alleges the accused amplifier's typical peak output of 5.75 volts falls within this range Compl. ¶38 A dispute could arise over whether "about" encompasses this specific value, or if manufacturing variations could cause some accused devices to operate outside a narrowly construed range.
  • Technical Questions: The complaint's allegations regarding the amplifier's functionality rely heavily on the identification of the "P8945 CUA4Y" integrated circuit and the associated PAM8945 datasheet Compl. ¶¶24-25 A key evidentiary question will be whether discovery confirms that all accused products contain this specific chip and that the chip operates in the manner described in the provided datasheet excerpts when implemented in the accused system.

V. Key Claim Terms for Construction

• The Term: "about 5 to 6 volts"
• Context and Importance: This term is central to the infringement allegation, as it defines the specific performance characteristic of the claimed boost converter. The plaintiff's case hinges on the accused amplifier's typical 5.75V output falling within this range Compl. ¶38 The defendant may argue for a narrower construction of "about" to exclude this value or to create a non-infringement argument based on operational variance.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The patent specification does not appear to define a precise numerical boundary for "about," which may support an argument that the term should be given its ordinary meaning, encompassing values that are reasonably close to the 5-to-6-volt range, including 5.75V. The use of "about" itself suggests the inventors did not intend to be limited to the exact numerical endpoints.
  • Evidence for a Narrower Interpretation: The specification discusses the need to boost voltage from a 3.7V cell but does not appear to provide explicit examples or embodiments with voltages outside the 5-to-6-volt range '081 Patent, col. 3:55-65 '081 Patent, col. 15:37-41 A defendant could argue that the lack of other disclosed ranges implies the inventors considered this range to be a critical and specific aspect of the invention, justifying a narrow interpretation of "about."

VI. Other Allegations

• Indirect Infringement: The complaint makes a conclusory allegation of indirect infringement, stating the defendant is on notice by virtue of the complaint itself Compl. ¶41 It does not plead specific facts supporting inducement or contributory infringement, such as allegations that user manuals instruct customers to use the product in an infringing manner.
• Willful Infringement: The complaint alleges willful infringement based on knowledge of the '081 Patent acquired "at least by the filing of this Complaint" Compl. ¶41 Compl. ¶43 This allegation appears to be based on post-suit knowledge.

VII. Analyst's Conclusion: Key Questions for the Case

• A core issue will be one of definitional scope: How will the court construe the term "about 5 to 6 volts"? The answer will determine whether the accused amplifier's specified typical output of 5.75 volts meets this claim limitation, a critical point in the infringement analysis.
• A second key issue will be evidentiary confirmation: Can the plaintiff prove through discovery that the accused products consistently contain the specific PAM8945 amplifier and that this component, as integrated into the final product, reliably operates according to the datasheet specifications cited in the complaint, particularly regarding its voltage output and use of PWM?
• A final question relates to commercial reality: The complaint alleges that incorporating a specific, commercially available amplifier into a standard single-cell speaker "necessarily results" in an infringing system Compl. ¶39 The case may explore whether non-infringing design alternatives were readily available to the defendant, which could influence damages and willfulness considerations.