DCT
5:26-cv-08066
ZephyrHub LLC v. Apple Inc
Key Events
Amended Complaint
Table of Contents
complaint Intelligence
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: ZephyrHub LLC (Texas)
- Defendant: Apple Inc. (California)
- Plaintiff's Counsel: Katz PLLC
- Case Identification: 7:25-cv-519, W.D. Tex., 01/23/2026
- Venue Allegations: Plaintiff alleges venue is proper in the Western District of Texas based on Defendant's regular and established places of business within the district, substantial revenue derived from infringing activities in the district, and prior court rulings affirming the district as a proper venue for patent actions against Apple.
- Core Dispute: Plaintiff alleges that Defendant's Apple USB-C Digital AV Multiport Adapter infringes patents related to power management and data transmission functionalities in a computing hub.
- Technical Context: The technology at issue involves USB hubs designed to simultaneously manage data transfer and provide rapid charging for connected portable devices by integrating complex power converters.
- Key Procedural History: The complaint states that Plaintiff (under its former name, PatentBridge Solutions LLC) sent a notice letter to Defendant on September 17, 2025, which was received on September 22, 2025, identifying the Asserted Patents and the accused product.
Case Timeline
| Date | Event |
|---|---|
| 2015-01-12 | Priority Date for '421 Patent & '939 Patent |
| 2018-01-09 | U.S. Patent No. 9,864,421 Issues |
| 2018-06-12 | U.S. Patent No. 9,997,939 Issues |
| 2025-09-22 | Defendant Receives Notice Letter |
| 2026-01-23 | Complaint Filed |
II. Technology and Patent(s)-in-Suit Analysis
U.S. Patent No. 9,864,421 - "Hub Having Complex Power Converters," Issued January 9, 2018
The Invention Explained
- Problem Addressed: The patent's background describes that as portable devices proliferate, the standard USB ports on computers often cannot supply enough power for rapid charging, especially for multiple devices simultaneously, creating inconvenience for users who must carry separate power adapters (ʼ421 Patent, col. 1:20-41; '421 Patent, col. 2:1-15).
- The Patented Solution: The invention is a hub that connects to a host computer ("electronic equipment") and provides both data transmission and enhanced power to a "portable device" ʼ421 Patent, abstract It incorporates a DC/DC converter to regulate and stabilize voltage drawn from the host, enabling a "rapid charge mode" for the connected device that would otherwise be unavailable, while still allowing for simultaneous data transfer (ʼ421 Patent, col. 6:39-53; '421 Patent, Fig. 2A).
- Technical Importance: This approach consolidates the functions of a data hub and a dedicated charger into a single accessory, addressing the growing need for efficient power management in an ecosystem of increasingly power-hungry portable electronics ʼ421 Patent, col. 2:1-15
Key Claims at a Glance
- The complaint asserts at least independent claim 1 Compl. ¶45
- The essential elements of independent claim 1 include:
- A hub for connecting electronic equipment and a portable device via a USB cable.
- A first connector for connecting to the electronic equipment.
- A second connector for connecting to the portable device.
- A controller connected between the connectors to facilitate mutual data transmission.
- A first DC/DC converter with an input connected to the electronic equipment and an output connected to the portable device, configured to output stable voltage to the portable device.
- The first connector is a USB 3.1 Power Delivery (PD) type C port, and the electronic equipment is operable in charged or power-supplying modes via the USB PD protocol.
- The complaint reserves the right to assert additional claims Compl. ¶47
U.S. Patent No. 9,997,939 - "Hub," Issued June 12, 2018
The Invention Explained
- Problem Addressed: The ʼ939 Patent, a continuation-in-part of the '421 Patent's application, addresses the same core problem: the inadequacy of standard computer ports for rapidly charging modern portable devices and the inconvenience of needing multiple accessories (ʼ939 Patent, col. 1:11-23; '939 Patent, col. 2:1-15).
- The Patented Solution: This patent expands on the hub concept by explicitly incorporating an external power source, such as an AC adapter, in addition to the host computer ʼ939 Patent, abstract The hub includes a power converter with an AC/DC converter and a second DC/DC converter, allowing it to draw power from a wall outlet. It also describes a current-sharing circuit to intelligently combine power from both the host and the external source to charge connected devices (ʼ939 Patent, col. 3:54-68; '939 Patent, Fig. 4).
- Technical Importance: The invention describes a more versatile docking station capable of managing and distributing power from multiple input sources, thereby supporting a wider range of high-power charging scenarios for multiple peripherals ʼ939 Patent, col. 9:40-51
Key Claims at a Glance
- The complaint asserts at least independent claim 1 Compl. ¶45
- The essential elements of independent claim 1 include:
- A hub for connecting electronic equipment and a portable device via a USB cable that has a signal line and a power line.
- A first connector for connecting to the electronic equipment.
- At least a second connector, "communicatively connected" to the first connector and electrically connected to the portable device, enabling mutual data transmission.
- The first connector is a USB 3.1 Power Delivery (PD) type C port, and the electronic equipment is operable in charged or power-supplying modes via the USB PD protocol.
- The complaint reserves the right to assert additional claims Compl. ¶47
III. The Accused Instrumentality
Product Identification
The Apple USB-C Digital AV Multiport Adapter (the "Accused Product") Compl. ¶22
Functionality and Market Context
The complaint alleges the Accused Product is a hub that connects a host device (e.g., a Mac or iPad) via a built-in USB-C cable to an HDMI display, a standard USB-A peripheral, and a USB-C charging cable Compl. ¶26 Compl. ¶51 Its alleged function is to allow a user to output video to an external display, connect a legacy USB device, and pass-through power to charge the host device, all simultaneously through a single port on the host Compl. ¶51 The complaint identifies a Cypress Semiconductor port controller and a Monolithic Power Systems DC/DC converter as key internal components that allegedly enable the infringing functionality Compl. ¶29 Compl. ¶30 The product is marketed as an essential accessory for Apple's modern devices, which have largely transitioned to USB-C connectivity Compl. ¶51 Compl. ¶52 The complaint includes a teardown image identifying a Cypress Semiconductor CYPD5225-96BZX part as the USB Type-C Port Controller Compl. ¶29
IV. Analysis of Infringement Allegations
'421 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| A hub electrically connecting to electronic equipment and a portable device located in an external environment via an Universal Serial Bus (USB) cable... | The Accused Product is a hub connecting to electronic equipment (e.g., a MacBook) and a portable device (e.g., a peripheral) via a USB cable. This configuration is shown on the product's packaging. | ¶26 | col. 6:1-8 |
| a first connector, electrically connected to the electronic equipment via the USB cable; | The integrated USB-C cable on the Accused Product is alleged to be the "first connector" that connects to the "electronic equipment" (host device). | ¶27 | col. 5:54-61 |
| a second connector, electrically connected to the portable device via the USB cable; | The USB-A, HDMI, and USB-C ports on the Accused Product are alleged to be the "second connector" that connects to a "portable device" (peripheral). | ¶28 | col. 6:63-65 |
| a controller, electrically connected between the first connector and the second connector, the controller has data transmission between the portable device and the electronic equipment mutually... | The Accused Product contains a Cypress Semiconductor port controller (CYPD5225-96BZX) that allegedly manages data transmission between the connected devices. | ¶29 | col. 6:6-13 |
| a first direct current (DC)/DC converter... applied to output stable voltage to the portable device; | The Accused Product contains a Monolithic Power Systems MP8859 DC/DC Converter which is alleged to provide stable voltage to the portable device. The complaint provides a teardown image identifying this component. | ¶30 | col. 6:39-49 |
| wherein the first connector is USB 3.1 Power Delivery (PD) type C port, and the electronic equipment is operable either in a charged mode or in a power supplying mode via the USB PD protocol. | The first connector is identified as a USB-C port, and the complaint alleges the MP8859 converter's functionality meets USB PD requirements, allowing the host equipment to operate in different power modes. | ¶¶31-32 | col. 4:1-4 |
'939 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| A hub, electrically connecting to an electronic equipment and at least a portable device located in external environment via a Universal Serial Bus cable... | The Accused Product is alleged to be a hub that connects electronic equipment and a portable device, as illustrated on the product packaging. | ¶36 | col. 1:26-30 |
| the Universal Serial Bus cable comprising a signal transmission line and a power transmission line; | The USB cable of the Accused Product is alleged to comprise both signal and power transmission lines. | ¶36 | col. 1:30-32 |
| a first connector, electrically connected to the electronic equipment via the Universal Serial Bus cable; | The integrated USB-C cable of the Accused Product is alleged to be the "first connector" connecting to the host "electronic equipment." | ¶37 | col. 6:5-7 |
| at least a second connector, communicatively connected to the first connector and electrically connected to the portable device via the Universal Serial Bus cable, wherein a data transmission between the portable device and the electronic equipment mutually is via the signal transmission line, the first connector, and the second connector; | The ports on the adapter are alleged to be the "second connector," and the internal Cypress controller is alleged to provide the communicative connection for mutual data transmission. | ¶¶38-39 | col. 6:17-23 |
| wherein the first connector is a Universal Serial Bus 3.1 Power Delivery type C port, and the electronic equipment can be either in a charged mode or in a power supplying mode... | The complaint alleges the first connector is a USB-PD Type-C port and that the connected electronic equipment can operate in different power modes, citing the internal DC/DC converter as enabling this functionality. | ¶¶40-43 | col. 4:10-13 |
Identified Points of Contention
- Scope Questions: A potential issue for the '421 patent is the mapping of claim terms to the accused system. Claim 1 requires the DC/DC converter to output stable voltage to the "portable device" (the peripheral). However, the primary charging function of the Accused Product is to pass power to the host computer (the alleged "electronic equipment"). This raises the question of whether the roles of "electronic equipment" and "portable device" as defined by the patent's power-flow architecture align with the functionality of the accused system.
- Technical Questions: For the '421 patent, a key factual question will be whether the identified MP8859 DC/DC converter is electrically configured within the Accused Product to regulate and supply power to the peripheral ports (the alleged "portable device") as the claim requires. The complaint's evidence shows the component is present and capable of certain functions, but may not show its specific implementation matches the claim limitation.
- Scope Questions: For the '939 patent, the construction of "communicatively connected to the first connector" could be a point of dispute. A court may need to determine if this requires a specific type of direct or indirect connection that is or is not present in the accused hub's controller-mediated architecture.
V. Key Claim Terms for Construction
The Term: "portable device"
- Context and Importance: This term's definition is critical because the claims of the '421 patent require the DC/DC converter to deliver power to the "portable device." Plaintiff maps this term to peripherals connected to the adapter's ports Compl. ¶28 If Defendant can argue that the "portable device" is the primary item being charged by the hub (i.e., the host MacBook or iPad), it would disrupt Plaintiff's infringement theory, as Plaintiff maps the host computer to "electronic equipment."
- Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The specification provides examples of "portable device 30" as "a mobile phone, a tablet PC, a Card Reader or a storage device etc." ʼ421 Patent, col. 6:65-67, which supports mapping the term to a peripheral.
- Evidence for a Narrower Interpretation: The abstract and detailed description heavily link the "portable device" to receiving power for "rapid charge" ʼ421 Patent, abstract ʼ421 Patent, col. 6:13-16 A party could argue that the term should be defined by this primary function, potentially pointing to the host computer in the accused use case.
The Term: "electronic equipment"
- Context and Importance: This term is the source of power and data in the claimed invention, which Plaintiff maps to the host MacBook or iPad Compl. ¶27 The functional relationship between the "electronic equipment" (power source) and "portable device" (power recipient) is fundamental to the claim structure.
- Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The specification lists "an AIO (All in one) PC, a desktop computer, or a notebook computer" as examples of "electronic equipment 10" ʼ421 Patent, col. 6:61-63, which aligns with Plaintiff's infringement theory.
- Evidence for a Narrower Interpretation: Claim 1 of the '421 patent states the "electronic equipment is operable either in a charged mode or in a power supplying mode." This dual-role capability, contemplated by the patent itself, could be used to argue that the distinction between the power-supplying "electronic equipment" and power-receiving "portable device" is not fixed and depends on the operational context, potentially creating ambiguity for infringement.
VI. Other Allegations
- Indirect Infringement: Plaintiff alleges induced infringement, stating that Defendant's marketing materials, user guides, website content, and product packaging instruct customers on how to use the Accused Product in an infringing manner Compl. ¶48 Compl. ¶49 Compl. ¶50 Compl. ¶51 Compl. ¶52 Compl. ¶53 The complaint also pleads contributory infringement, alleging the Accused Product is especially designed to operate in an infringing way and has no substantial non-infringing uses Compl. ¶54
- Willful Infringement: The willfulness allegation is based on alleged pre-suit knowledge of the patents from a notice letter Plaintiff sent to Defendant, which was allegedly received on September 22, 2025 (Compl. ¶¶10; Compl. ¶18; Compl. ¶57). Plaintiff further alleges that Defendant was willfully blind by maintaining a policy or practice of not reviewing the patents of others Compl. ¶57 Compl. ¶58
VII. Analyst's Conclusion: Key Questions for the Case
- A core issue will be one of definitional mapping: Can the patent's distinct roles of a power-providing "electronic equipment" and a power-receiving "portable device" be mapped onto Apple's ecosystem, where the accused adapter's primary charging function is to power the host device, which Plaintiff identifies as the "electronic equipment"?
- A key evidentiary question will be one of functional operation: Beyond the mere presence of a DC/DC converter, what evidence will be presented to show that this component, as implemented in the Accused Product's circuit, actually performs the claimed function of delivering regulated, stable voltage to a peripheral device, as required by claim 1 of the '421 patent?
- The case may also turn on a question of claim scope: How will the court construe the phrase "communicatively connected" in claim 1 of the '939 patent? The outcome could depend on whether this requires a direct structural link or if a controller-mediated pathway, as allegedly found in the accused adapter, satisfies the limitation.
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