Near Field Electronics LLC v. Dollar Tree Stores Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Near Field Electronics LLC (Texas)
  • Defendant: Dollar Tree Stores, Inc. (Virginia)
  • Plaintiff's Counsel: Shea | Beaty PLLC
• Case Identification: 4:26-cv-00636, E.D. Tex., 06/12/2026
• Venue Allegations: Venue is alleged to be proper based on Defendant having a regular and established place of business within the Eastern District of Texas.
• Core Dispute: Plaintiff alleges that Defendant's use of Near Field Communication (NFC) front-end components in its point-of-sale systems for contactless payments infringes five patents related to integrated circuit architecture, bus protocols, and power management.
• Technical Context: The asserted patents address methods for creating flexible, low-cost integrated circuits capable of handling multiple communication protocols and managing power consumption efficiently.
• Key Procedural History: The complaint notes that four of the five asserted patents have expired. For these patents, Plaintiff limits its claim for damages to a period of approximately two to three years preceding their respective expiration dates.

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 Issue Date
2004-05-25	'071 Patent Issue Date
2005-01-11	'531 Patent Priority Date
2005-10-25	'350 Patent Issue Date
2006-02-07	'727 Patent Issue Date
2008-05-13	'531 Patent Issue Date
2020-06-12	Start of Alleged Infringement Period
2021-11-21	'071 Patent Expiration Date
2022-01-31	'201 Patent Expiration Date
2022-04-14	'727 Patent Expiration Date
2023-08-12	'350 Patent Expiration Date
2026-03-19	Stated Expiration Date of '531 Patent
2026-06-12	Complaint Filing Date

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

U.S. Patent No. 6,691,201 - "Dual Mode USB-PS/2 Device"

The Invention Explained

• Problem Addressed: The patent describes that conventional peripheral devices, such as computer mice, required additional external components, greater circuit board space, and complex firmware to support multiple communication protocols like Universal Serial Bus (USB) and Personal System 2 (PS/2), leading to higher costs and potentially compromised performance '201 Patent, col. 1:28-50
• The Patented Solution: The invention provides a single integrated circuit capable of automatically detecting which protocol a connected bus is using (e.g., USB or PS/2) and configuring itself to operate with that protocol using a single set of input/output pins '201 Patent, abstract '201 Patent, col. 2:44-58 This "single chip solution" is intended to eliminate the need for external components, simplify firmware, and reduce board space and cost '201 Patent, col. 1:50-54
• Technical Importance: This approach offered a more integrated and cost-effective method for manufacturers to create peripherals compatible with multiple interface standards.

Key Claims at a Glance

• The complaint asserts at least independent method claim 14 Compl. ¶31
• Claim 14 requires:
  • A method for automatically selecting a signaling protocol for communicating with a host.
  • Detecting a signaling protocol of a bus connected to an integrated circuit that operates in a plurality of signaling protocols.
  • Configuring the integrated circuit to communicate in one of the plurality of protocols in response to the detected protocol.
  • Operating in each selected protocol over the connected bus through a single set of pins.
• The complaint reserves the right to assert additional claims Compl. ¶32

U.S. Patent No. 6,742,071 - "Real-time I/O Processor Used to Implement Bus Interface Protocols"

The Invention Explained

• Problem Addressed: The patent explains that conventional bus interfaces were either rigid and protocol-specific, or were user-programmable in a way that was difficult and lacked the flexibility for complex signaling '071 Patent, col. 1:14-48 These interfaces typically acted as "slave" devices, responding to control signals from a "master" external logic circuit '071 Patent, col. 2:4-15
• The Patented Solution: The invention discloses a real-time I/O processor, described as a General-Purpose Interface (GPIF), that functions as a "master" device '071 Patent, col. 4:20-24 This processor uses a limited instruction set to generate interface-specific control signals and respond to external events in real time, enabling it to implement various bus protocols flexibly and at high speed without rigid, protocol-specific hardware '071 Patent, col. 6:4-16 '071 Patent, abstract
• Technical Importance: This architecture provided a programmable, high-speed solution for interfacing with multiple or evolving bus protocols, replacing inflexible hardware designs.

Key Claims at a Glance

• The complaint asserts at least independent method claim 15 Compl. ¶36
• Claim 15 requires:
  • A method for providing an interface to an external bus.
  • Generating a plurality of first control signals in response to a processor's current state.
  • Progressing to a next state based on the current state, an internal control signal, and an input signal received from the external bus.
  • Driving at least one output control signal onto the external bus.
  • Updating the current state to the next state.
• The complaint reserves the right to assert additional claims Compl. ¶37

U.S. Patent No. 6,959,350 - "Configurable USB Interface With Virtual Register Architecture"

• Technology Synopsis: The patent addresses the inefficiency of using hard-coded endpoint configurations in USB interface controllers, which required creating and maintaining different versions of hardware description language (HDL) code Compl. ¶20 The invention provides a configurable interface controller where a configuration package is used at compile time to generate flexible configuration circuitry (e.g., registers or combinational logic), allowing the controller to be configured "on-the-fly" for different USB endpoints without needing separate HDL code for each one Compl. ¶19 Compl. ¶21
• Asserted Claims: At least claim 10 Compl. ¶41
• Accused Features: The complaint alleges that NFC Front-end components used for contactless payments infringe this patent Compl. ¶41

U.S. Patent No. 6,996,727 - "Power Supply for Universal Serial Bus Interface with Programmable Bus Pullup Resistor"

• Technology Synopsis: The patent addresses the power consumption of conventional USB power supplies, which provided a constant voltage with no low-power mode Compl. ¶25 The patented solution is a power supply architecture for a bus interface that operates in two modes: a standard mode with a normal regulated voltage, and a power-down (standby) mode that reduces current consumption by turning off the main supply and using a low-power programmable resistor to maintain the necessary pullup function Compl. ¶24
• Asserted Claims: At least claim 18 Compl. ¶46
• Accused Features: The complaint alleges that NFC Front-end components used for contactless payments infringe this patent Compl. ¶46

U.S. Patent No. 7,373,531 - "Signal Detection Method, Frequency Detection Method, Power Consumption Control Method, Signal Detecting Device, Frequency Detecting Device, Power Control Consumption Device and Electronic Apparatus"

• Technology Synopsis: The patent is directed to methods for reducing power consumption by detecting the operational state of an electronic device Compl. ¶29 The invention achieves this by monitoring the "through current" flowing in a circuit with connected transistors; the presence, absence, or frequency of this current indicates the operational state of a target, which can then be used to trigger a power-stopping or power-reducing process Compl. ¶28
• Asserted Claims: At least claim 2 Compl. ¶51
• Accused Features: The complaint alleges that NFC Front-end components used for contactless payments infringe this patent 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," as well as other components with "functionality materially similar" Compl. ¶31

Functionality and Market Context

• The complaint alleges that Defendant Dollar Tree 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 This use is described as part of Defendant's "regular course of its business operations for processing NFC payment transactions," indicating their role in commercial retail payment systems Compl. ¶33 The complaint provides no further technical detail on the operation of the accused components. No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint alleges direct infringement of all five patents-in-suit, stating that the use of the Accused Instrumentalities for contactless payment processing performs the steps of the asserted method claims Compl. ¶31 Compl. ¶36 Compl. ¶41 Compl. ¶46 Compl. ¶51 For each count, the complaint references an external exhibit containing a preliminary infringement analysis (e.g., Exhibit A-1, B-1), but these exhibits were not provided with the complaint document Compl. ¶32 Compl. ¶37 Compl. ¶42 Compl. ¶47 The narrative allegations in the complaint are conclusory and do not map specific features of the accused products to the individual limitations of the asserted claims.

• Identified Points of Contention:
  • Scope Questions: A central issue may be whether the claims of the asserted patents, which are described in the context of specific wired protocols like USB and PS/2 '201 Patent, Title '201 Patent, col. 1:13-27 or general-purpose I/O processors '071 Patent, abstract, can be construed to cover the technology of Near Field Communication (NFC). The court may need to determine if the term "signaling protocol" as used in the '201 Patent, for instance, is broad enough to read on the distinct technical standards of NFC.
  • Technical Questions: The complaint lacks specific factual allegations detailing how the accused NFC components operate. This raises fundamental evidentiary questions. For the '071 Patent, which claims a method performed by a "master" device that generates control signals '071 Patent, col. 4:20-24, a key question will be whether the accused NFC component functions as such a master processor or merely as a "slave" transceiver controlled by a separate processor within the point-of-sale terminal.

V. Key Claim Terms for Construction

• The Term: "signaling protocol" (from '201 Patent, claim 14)

• Context and Importance: The construction of this term may be dispositive for the infringement analysis of the '201 Patent. The patent's title, background, and detailed description focus exclusively on USB and PS/2 protocols. The case may turn on whether "signaling protocol" is limited to that context or is broad enough to encompass unrelated technologies like NFC. Practitioners may focus on this term because the viability of applying this 2000-era patent to modern NFC technology depends on its interpretation.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The claim language itself uses the generic phrase "a plurality of signaling protocols" without expressly limiting it to USB or PS/2 '201 Patent, col. 6:66-67
  • Evidence for a Narrower Interpretation: The specification, including the title ("Dual Mode USB-PS/2 Device"), abstract, and detailed description, consistently frames the invention as a solution for switching between USB and PS/2 '201 Patent, Title '201 Patent, col. 1:13-27 '201 Patent, col. 2:39-50 This consistent focus could support an argument that the inventors defined their invention within that specific technological context.

• The Term: "processor" (from '071 Patent, claim 15)

• Context and Importance: Claim 15 of the '071 Patent recites a method whose steps are tied to the "current state of a processor." The infringement question will depend on whether the accused NFC component contains or functions as a "processor" that executes state-based instructions in the manner claimed.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The term "processor" is a general term in the art, and an argument could be made that any logic circuit capable of executing a sequence of operations qualifies.
  • Evidence for a Narrower Interpretation: The specification describes the processor in detail as a specialized architecture (GPIF) with a specific two-instruction set designed to generate waveforms and branch on external signals '071 Patent, col. 5:6-10 '071 Patent, col. 8:13-28 This detailed description of a specific embodiment may be used to argue for a narrower construction that requires a similar instruction-based architecture, not just any generic logic controller.

VI. Other Allegations

• Indirect Infringement: The complaint does not contain allegations of indirect or contributory infringement.
• Willful Infringement: The complaint does not allege willful infringement or seek enhanced damages under 35 U.S.C. § 284. It does, however, request a declaration that the case is "exceptional" for the purpose of seeking attorneys' fees under 35 U.S.C. § 285 Compl., p. 12, ¶C

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

1. A core issue will be one of definitional scope: Can claim terms like "signaling protocol" and "processor," which are rooted in the patents' context of early-2000s wired peripheral interfaces (USB/PS/2) and specific I/O architectures, be construed broadly enough to cover the distinct technology of modern wireless NFC components used in payment systems?

2. A second key issue will be one of evidentiary sufficiency: The complaint makes high-level, conclusory allegations of infringement. A central question for the litigation will be whether the Plaintiff can produce factual evidence through discovery to demonstrate that the accused NFC components technically operate in the specific manner required by each element of the asserted claims, such as functioning as a "master" I/O processor or implementing the claimed power-saving and signal-detection methods.