DCT

4:26-cv-00637

Near Field Electronics LLC v. AT&T Mobility LLC

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 4:26-cv-00637, E.D. Tex., 06/12/2026
  • Venue Allegations: Venue is alleged to be proper based on Defendant AT&T Mobility LLC having a regular and established place of business in the district, specifically in Frisco, Texas.
  • Core Dispute: Plaintiff alleges that Defendant's use of Near Field Communication (NFC) components for contactless payments infringes five patents related to integrated circuit architecture, multi-protocol communication, and power management.
  • Technical Context: The patents address foundational technologies for integrated circuits that enable flexible communication between different bus protocols and manage power consumption, technologies that are critical in modern electronics.
  • Key Procedural History: The complaint notes that four of the five asserted patents have expired. For these patents, Plaintiff asserts liability only for a past infringement period, beginning June 12, 2020, and ending on each patent's respective expiration date.

Case Timeline

Date Event
2000-06-21 '201 Patent Priority Date
2000-07-25 '071 Patent Priority Date
2000-08-28 '727 Patent Priority Date
2002-06-28 '350 Patent Priority Date
2004-02-10 '201 Patent Issued
2004-05-25 '071 Patent Issued
2005-01-11 '531 Patent Priority Date
2005-10-25 '350 Patent Issued
2006-02-07 '727 Patent Issued
2008-05-13 '531 Patent Issued
2020-06-12 Alleged Infringement Period Begins
2021-11-21 '071 Patent Expired
2022-01-31 '201 Patent Expired
2022-04-14 '727 Patent Expired
2023-08-12 '350 Patent Expired
2026-03-19 '531 Patent Expiration Date
2026-06-12 Complaint Filed

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

U.S. Patent No. 6,691,201 - "Dual Mode USB-PS/2 Device" (issued Feb. 10, 2004)

The Invention Explained

  • Problem Addressed: The patent describes that supporting multiple peripheral communication protocols, such as USB and PS/2, conventionally required additional external components, complex firmware, and dedicated I/O pins, which increased cost, board space, and design complexity Compl. ¶11 '201 Patent, col. 1:28-50
  • The Patented Solution: The invention is a single integrated circuit that can automatically detect and operate in multiple signaling protocols (specifically USB and PS/2) using a single, shared set of I/O pins Compl. ¶10 '201 Patent, abstract This "single chip solution" eliminates the need for external components and simplifies the firmware required to manage the different protocols Compl. ¶12 '201 Patent, col. 2:51-61
  • Technical Importance: This approach provided a more integrated and cost-effective solution for peripheral manufacturers to ensure their devices could connect to a wider range of computer systems without requiring multiple hardware versions.

Key Claims at a Glance

  • The complaint asserts independent claim 14 Compl. ¶31
  • The essential elements of claim 14 are:
    • A method for automatically selecting a signaling protocol for communicating with a host comprising the steps of:
    • (A) detecting a signaling protocol of a bus connected to an integrated circuit that operates in a plurality of signaling protocols; and
    • (B) configuring said integrated circuit to communicate in one of said plurality of signaling protocols in response to said detected signaling protocol of said connected bus,
    • wherein each of said selected protocols operate over said connected bus through a single set of pins.
  • The complaint reserves the right to amend its infringement analysis but does not explicitly reserve the right to assert other claims Compl. ¶32

U.S. Patent No. 6,742,071 - "Real-time I/O Processor Used to Implement Bus Interface Protocols" (issued May 25, 2004)

The Invention Explained

  • Problem Addressed: The patent addresses the limitations of conventional bus interfaces, which were either protocol-specific and therefore inflexible, or user-programmable but too slow and simple for implementing complex, high-speed interface signaling Compl. ¶16 '071 Patent, col. 1:15-48
  • The Patented Solution: The invention discloses a real-time input/output (I/O) processor architecture, described as a General-Purpose Interface (GPIF), that acts as a master device Compl. ¶15 Compl. ¶16 It uses a limited instruction set to generate interface-specific waveforms and respond to external events in real time, allowing control outputs and data path decisions to be changed each clock cycle '071 Patent, abstract '071 Patent, col. 4:41-50 '071 Patent, col. 6:4-16
  • Technical Importance: This technology provided a flexible and high-speed alternative to rigid, protocol-specific hardware, enabling a single chip to implement multiple or evolving bus protocols efficiently.

Key Claims at a Glance

  • The complaint asserts independent claim 15 Compl. ¶36
  • The essential elements of claim 15 are:
    • A method for providing an interface to an external bus, comprising the steps of:
    • (A) generating a plurality of first control signals in response to a current state of a processor;
    • (B) progressing to a next state based on said current state, at least one internal control signal of said first control signals and an input signal received from said external bus;
    • (C) driving at least one output control signal of said first controls signals onto said external bus; and
    • (D) updating said current state to said next state.
  • The complaint reserves the right to amend its infringement analysis but does not explicitly reserve the right to assert other claims Compl. ¶37

U.S. Patent No. 6,959,350 - "Configurable USB Interface With Virtual Register Architecture" (issued Oct. 25, 2005)

Technology Synopsis

The complaint states that conventional USB interface controllers used hard-coded endpoint configurations, requiring different, error-prone HDL code for each new version Compl. ¶20 The '350 patent discloses a configurable bus interface controller that uses an HDL-based configuration package to generate the necessary configuration circuitry, allowing the controller to be flexibly configured without requiring separate HDL code for each endpoint Compl. ¶19 Compl. ¶21

Asserted Claims

Independent claim 10 Compl. ¶41

Accused Features

The complaint alleges infringement by NFC Front-end components, including the NXP PN512, when used to process contactless credit card payments Compl. ¶41

U.S. Patent No. 6,996,727 - "Power Supply for Universal Serial Bus Interface with Programmable Bus Pullup Resistor" (issued Feb. 7, 2006)

Technology Synopsis

The patent addresses the lack of low-power modes in conventional power supplies that provided only a constant voltage Compl. ¶25 The invention provides a dual-mode power supply architecture for a USB interface that includes a standard operating mode and a power-down (standby) mode, which uses a low-power programmable resistor to maintain the necessary pullup function, thereby reducing current consumption during idle states Compl. ¶24

Asserted Claims

Independent claim 18 Compl. ¶46

Accused Features

The complaint alleges infringement by NFC Front-end components, including the NXP PN512, when used to process contactless credit card payments Compl. ¶46

U.S. Patent No. 7,373,531 - "Signal Detection Method...and Electronic Apparatus" (issued May 13, 2008)

Technology Synopsis

The patent is directed to methods for detecting signals and power status by monitoring the current in a circuit Compl. ¶28 The invention detects the presence, absence, or frequency of a signal by applying it to transistor gates and determining whether a "through current" flows, which enables power reduction by stopping or reducing the power supply when a target is in a non-operational state Compl. ¶28 Compl. ¶29

Asserted Claims

Independent claim 2 Compl. ¶51

Accused Features

The complaint alleges infringement by NFC Front-end components, including the NXP PN512, when used to process contactless credit card payments Compl. ¶51

III. The Accused Instrumentality

Product Identification

The accused instrumentalities are "NFC Front-end components, including without limitation the NXP PN512 NFC Front-End" and other components with "functionality materially similar" Compl. ¶31

Functionality and Market Context

The complaint alleges that AT&T uses or causes these components to be used to "perform the claimed method during contactless credit card payment transactions at a point of sale" Compl. ¶31 The use is described as being in the "regular course of its business operations for processing NFC payment transactions" Compl. ¶33 The complaint does not provide further technical detail on the specific operation of the accused components.

IV. Analysis of Infringement Allegations

The complaint references but does not include claim chart exhibits (e.g., Ex. A-1, B-1) that purportedly detail its infringement theories Compl. ¶32 Compl. ¶37 The complaint's narrative theory is that by using the accused NFC components to process contactless payments, AT&T performs each step of the asserted method claims Compl. ¶33 Compl. ¶38 Without the exhibits, a detailed element-by-element analysis is not possible.

No probative visual evidence provided in complaint.

  • Identified Points of Contention:
    • Scope Questions: A primary point of contention may be whether the claims, which are described in the patents' specifications in the context of wired computer peripheral protocols like USB and PS/2, can be construed to read on the accused instrumentalities, which are modern NFC components for wireless communication. For example, for the '201 patent, a question is whether an NFC chip "automatically selects one of said plurality of signaling protocols" in the manner contemplated by an invention focused on USB/PS/2 interoperability.
    • Technical Questions: The infringement allegations are highly generalized. A key technical question for the court will be whether the actual, specific operations of the accused NFC front-end components can be mapped to the discrete steps of the asserted method claims. For the '071 patent, this raises the question of what evidence demonstrates that the accused product's internal logic executes the specific state-machine progression required by claim 15.

V. Key Claim Terms for Construction

  • Term: "a plurality of signaling protocols" ('201 Patent, Claim 14)

    • Context and Importance: The '201 patent specification focuses exclusively on USB and PS/2 protocols. The accused product is an NFC component. The outcome of the dispute may depend on whether this term is limited to the types of distinct, wired protocols discussed in the patent or is broad enough to cover different modes or standards within a single wireless technology family.
    • Intrinsic Evidence for Broader Interpretation: The claim language itself is facially broad and does not contain an express limitation to "wired" protocols or any specific named protocols.
    • Intrinsic Evidence for a Narrower Interpretation: The patent's title, "Dual Mode USB-PS/2 Device," and the background section, which is entirely devoted to the problems of supporting both USB and PS/2, may support an interpretation that limits the scope to the specific context disclosed '201 Patent, title '201 Patent, col. 1:15-50

  • Term: "processor" ('071 Patent, Claim 15)

    • Context and Importance: Claim 15 recites a method with steps tied to a "processor" and its "current state." Infringement will require mapping the functionality of the accused NFC chip to this claimed processor. Practitioners may focus on whether the term "processor" should be construed as a general-purpose computing element or as the specific, specialized I/O processor architecture described in the specification.
    • Intrinsic Evidence for Broader Interpretation: The term "processor" is a generic term in the art and is not explicitly defined in a limiting way within the claim itself.
    • Intrinsic Evidence for a Narrower Interpretation: The specification describes a very specific "real-time I/O processor" or "GPIF" with a unique two-instruction set ("branch on signal" and "wait N clocks") '071 Patent, col. 5:5-11 '071 Patent, col. 8:13-22 This detailed description of a particular architecture may be used to argue for a narrower construction limited to processors with these specific characteristics.

VI. Other Allegations

  • Indirect Infringement: The complaint focuses on allegations of direct infringement by "using and/or causing to be used" the accused components Compl. ¶31 Compl. ¶36 The complaint does not plead specific facts to support claims of induced or contributory infringement, such as allegations of specific intent to encourage infringement by third parties or knowledge that a component was especially made for infringement.
  • Willful Infringement: The complaint does not include a specific count for willful infringement or allege pre-suit knowledge of the patents. The prayer for relief includes a request for a declaration that the case is "exceptional under 35 U.S.C. § 285," which could lead to an award of attorneys' fees, but this is distinct from a formal willfulness claim seeking enhanced damages Compl., prayer C

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

  • A core issue will be one of technological scope: can claims originating from and described in the context of wired computer peripheral interfaces (USB/PS/2) and general-purpose I/O processors be construed to cover the accused modern, single-function Near Field Communication (NFC) components used for wireless payments?
  • A second key issue will be one of evidentiary mapping: assuming the claim scope is found to be broad enough, the case will turn on a highly technical and factual analysis. The plaintiff will bear the burden of showing, with likely reliance on discovery and expert testimony, that the proprietary internal operations of the accused NFC chips perform the specific, multi-step methods recited in the asserted claims.
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