DCT

2:26-cv-00248

Induction Devices LLC v. Truist Bank

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 2:26-cv-00248, E.D. Tex., 03/24/2026
  • Venue Allegations: Venue is based on Defendant maintaining a place of business in Frisco, Texas, and regularly conducting business within the Eastern District of Texas.
  • Core Dispute: Plaintiff alleges that Defendant's use and provision of contactless credit cards infringes seven U.S. patents related to various aspects of semiconductor circuit design and function.
  • Technical Context: The patents-in-suit cover fundamental electronics technologies, including circuit reset mechanisms, signal processing, power management, and device communication protocols, which are foundational to modern integrated circuits.
  • Key Procedural History: The complaint notes that U.S. Patent No. 7,889,145 was previously litigated, but the cases resolved before any substantive matters were addressed. The complaint also asserts infringement of two expired patents, U.S. Patent Nos. 6,868,500 and 6,931,465, for the time periods before their respective expirations.

Case Timeline

Date Event
2000-10-26 Priority Date for U.S. Patent No. 6,868,500
2001-03-31 Priority Date for U.S. Patent No. 6,931,465
2005-03-15 U.S. Patent No. 6,868,500 Issued
2005-08-16 U.S. Patent No. 6,931,465 Issued
2006-01-26 Priority Date for U.S. Patent No. 7,449,926
2006-06-01 Priority Date for U.S. Patent No. 7,889,145
2006-12-21 Priority Date for U.S. Patent No. 8,190,885
2007-03-09 Priority Date for U.S. Patent No. 8,370,543
2007-04-17 Priority Date for U.S. Patent No. 8,543,628
2008-11-11 U.S. Patent No. 7,449,926 Issued
2011-03-01 U.S. Patent No. 7,889,145 Issued
2012-05-29 U.S. Patent No. 8,190,885 Issued
2013-02-05 U.S. Patent No. 8,370,543 Issued
2013-09-24 U.S. Patent No. 8,543,628 Issued
2022-06-09 U.S. Patent No. 6,931,465 Expired
2023-01-23 U.S. Patent No. 6,868,500 Expired
2026-03-24 Complaint Filed

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

U.S. Patent No. 7,449,926 - "Circuit for Asynchronously Resetting Synchronous Circuit," Issued November 11, 2008

The Invention Explained

  • Problem Addressed: Synchronous circuits like CPUs and RAMs may need to be reset differently depending on the circumstances Compl. ¶10 An asynchronous reset may be needed for immediate initialization during an abnormal operation, but this can cause data loss; a synchronous reset is preferred during normal operation to preserve data Compl. ¶11 '926 Patent, col. 1:35-44
  • The Patented Solution: The patent describes a reset signal generation circuit that detects the operational state of a synchronous circuit (e.g., a CPU) or the power supply voltage level Compl. ¶10 Compl. ¶12 Based on this detection, it selectively generates either a synchronous reset signal (to preserve data during normal operation) or an asynchronous reset signal (to immediately initialize the circuit during abnormal operation or a voltage drop) '926 Patent, abstract '926 Patent, col. 6:58-7:15
  • Technical Importance: This approach enhances circuit reliability by applying the appropriate type of reset for a given situation, helping to prevent data loss during routine resets while ensuring rapid, safe initialization during critical failures Compl. ¶11

Key Claims at a Glance

  • The complaint asserts at least independent claim 1 Compl. ¶44
  • Essential elements of claim 1 include:
    • An operation detection circuit for detecting whether a synchronous circuit is operating normally or abnormally.
    • A signal control circuit for generating a first reset signal based on a system reset signal, a clock signal, and the operation detection signal.
    • The signal control circuit generates the first reset signal synchronously to the clock signal when the synchronous circuit is operating normally.
    • The signal control circuit generates the first reset signal asynchronously to the clock signal when the synchronous circuit is operating abnormally.
  • The complaint does not explicitly reserve the right to assert dependent claims for this patent.

U.S. Patent No. 7,889,145 - "Circuit, System, and Method for Multiplexing Signals with Reduced Jitter," Issued March 1, 2011

The Invention Explained

  • Problem Addressed: In complex electronic systems, multiplexers are used to select one of several input signals (e.g., from different clock sources like Phase-Locked Loops or Delay-Locked Loops) Compl. ¶16 However, conventional multiplexer designs could introduce timing delays, crosstalk, and power supply noise, which degrade the performance and reliability of the system '145 Patent, col. 1:49-52 '145 Patent, col. 2:60-63
  • The Patented Solution: The patent proposes a multiplexer circuit and method designed to reduce jitter Compl. ¶15 The solution involves using a configuration of logic gates where a control signal ensures only one input signal is active at a time, thereby eliminating crosstalk at the gate inputs Compl. ¶17 '145 Patent, col. 3:20-26 The patent also teaches arranging the logic gates in separate power domains to further isolate them and reduce noise '145 Patent, col. 3:26-28
  • Technical Importance: The invention aimed to improve the reliability of synchronous systems by minimizing timing imperfections like clock skew and jitter that arise when selecting between multiple clock signals Compl. ¶16

Key Claims at a Glance

  • The complaint asserts at least independent claim 10 Compl. ¶54
  • Essential elements of claim 10 include:
    • Providing a first logic gate for receiving a first signal, a second logic gate for receiving a second signal, and a third logic gate coupled to the outputs of the first and second.
    • Deactivating one of the first and second signals by supplying a static control signal to the first and second logic gates.
    • Ensuring only one active signal is supplied to the inputs of the logic gates to eliminate crosstalk and power supply noise.
  • The complaint does not explicitly reserve the right to assert dependent claims for this patent.

U.S. Patent No. 8,190,885 - "Non-Volatile Memory Sub-System Integrated with Security for Storing Near Field Transactions," Issued May 29, 2012

  • Technology Synopsis: The patent describes a memory module that integrates a security processor, non-volatile memory, and a Near Field Communication (NFC) component Compl. ¶21 This integration creates a secure environment for processing and storing NFC transaction data, preventing unauthorized access and ensuring data integrity Compl. ¶22 '885 Patent, abstract The system allows for memory partitioning with individualized access rights and secure logging of transactions '885 Patent, col. 6:16-20
  • Asserted Claims: At least claims 1 and 3 are asserted Compl. ¶64
  • Accused Features: The complaint accuses unspecified features within the "contactless credit cards" of infringement Compl. ¶64

U.S. Patent No. 8,370,543 - "Busy Detection Logic for Asynchronous Communication Port," Issued February 5, 2013

  • Technology Synopsis: The patent is directed to systems and methods for synchronizing access to a device resource (e.g., memory) between components operating in different, independent time domains Compl. ¶25 The invention aims to solve this synchronization problem without requiring high-speed clocks or imposing restrictions on the pulse width of control signals, which were limitations of prior art designs that led to increased complexity and power consumption '543 Patent, col. 1:32-2:5
  • Asserted Claims: At least claim 16 is asserted Compl. ¶74 Compl. ¶81
  • Accused Features: The complaint accuses unspecified features within the "contactless credit cards" of infringement Compl. ¶74

U.S. Patent No. 8,543,628 - "Method and System of Digital Signal Processing," Issued September 24, 2013

  • Technology Synopsis: This patent describes a programmable, dynamically reconfigurable digital filtering system on a chip Compl. ¶30 A microcontroller sends instruction sets to configure a controller and an address-calculation device, which in turn select filter coefficients; a separate data path device then uses these coefficients to perform digital signal processing on incoming data '628 Patent, abstract '628 Patent, col. 2:23-3:2 This approach allows for dynamic reconfiguration and efficient resource use '628 Patent, col. 2:23-31
  • Asserted Claims: At least claim 1 is asserted Compl. ¶84
  • Accused Features: The complaint accuses unspecified features within the "contactless credit cards" of infringement Compl. ¶84

U.S. Patent No. 6,868,500 - "Power on Reset Circuit for a Microcontroller," Issued March 15, 2005

  • Technology Synopsis: The patent discloses a Power-On Reset (POR) circuit for microcontrollers that provides capabilities at multiple voltage levels and also manages post-boot-up power stability functions Compl. ¶34 Compl. ¶37 The invention addresses problems where prior POR circuits failed to handle post-booting power instability or required dedicated, expensive additional resources to do so '500 Patent, col. 1:58-62 The patented solution utilizes existing POR circuitry resources for additional functions, such as controlling a switch mode pump during and after boot-up '500 Patent, col. 2:44-52
  • Asserted Claims: At least claim 22 is asserted Compl. ¶94
  • Accused Features: The complaint accuses unspecified features within the "contactless credit cards" of infringement, and notes that liability is asserted for the period before the patent's expiration on January 23, 2023 Compl. ¶94 Compl. ¶96

U.S. Patent No. 6,931,465 - "Intelligent, Extensible SIE Peripheral Device," Issued August 16, 2005

  • Technology Synopsis: The patent is directed to a peripheral device with an "intelligent, extensible" serial interface engine (SIE) Compl. ¶40 Conventional SIEs acted merely as conduits, passing all requests from a host to an external processor, which reduced performance '465 Patent, col. 1:38-41 The invention improves on this by having the SIE autonomously handle basic protocol requests itself, only passing unrecognized or more complex requests to the external processor, thereby increasing performance and reducing overhead '465 Patent, col. 1:45-52
  • Asserted Claims: At least claim 13 is asserted Compl. ¶99
  • Accused Features: The complaint accuses unspecified features within the "contactless credit cards" of infringement, and notes that liability is asserted for the period before the patent's expiration on June 9, 2022 Compl. ¶99 Compl. ¶101

III. The Accused Instrumentality

Product Identification

  • The accused instrumentalities are identified as "contactless credit cards" Compl. ¶44

Functionality and Market Context

  • The complaint alleges that Defendant makes, uses, sells, imports, or provides these contactless credit cards Compl. ¶44 The cards are used in connection with credit and/or banking accounts maintained by the Defendant Compl. ¶96 The complaint does not provide any specific technical details regarding the internal components, architecture, or operation of the accused contactless credit cards. No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

For each of the seven asserted patents, the complaint states that an "Exemplary infringement analysis" is set forth in an external exhibit (e.g., Exhibit A-1, B-1, etc.) Compl. ¶45 Compl. ¶55 Compl. ¶65 Compl. ¶75 Compl. ¶85 Compl. ¶95 Compl. ¶100 These exhibits were not attached to the complaint. The complaint itself provides no narrative theory of infringement that maps specific features of the accused contactless credit cards to the elements of the asserted claims. Therefore, a detailed analysis of the infringement allegations is not possible based on the provided complaint.

Identified Points of Contention

  • Technological Applicability: A fundamental question for all asserted patents will be whether the specific and often complex circuit-level technologies they claim-such as microcontroller POR circuits ('500 Patent), advanced signal multiplexers ('145 Patent), and reconfigurable digital signal processors ('628 Patent)-are actually present within and operate in the claimed manner inside a standard contactless credit card. The defense may argue a fundamental mismatch between the sophisticated systems described in the patents and the more limited integrated circuits typically found in such cards.
  • Pleading Sufficiency: A threshold legal issue may arise concerning whether the complaint's allegations, which identify an accused product and a patent claim but offer no factual detail connecting the two, meet the plausibility standard required for patent infringement complaints. The complete reliance on unattached exhibits for the substance of the infringement theory may be a focus of early motion practice.

V. Key Claim Terms for Construction

'926 Patent, Claim 1

  • The Term: "synchronous circuit"
  • Context and Importance: The claim requires the detection of the operational state of a "synchronous circuit" to determine whether to issue a synchronous or asynchronous reset. The patent specification discusses this circuit in the context of a CPU, ROM, RAM, and peripheral circuits Compl. ¶11 The construction of this term will be critical to determine if any component within the accused contactless credit cards qualifies as the "synchronous circuit" contemplated by the patent.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: Practitioners may argue that any integrated circuit component that operates in coordination with a clock signal could be considered a "synchronous circuit," potentially broadening the claim's applicability.
    • Evidence for a Narrower Interpretation: The patent's consistent reference to a system comprising a "CPU 11, the ROM 13, the RAM 14, and the peripheral circuit 15" '926 Patent, col. 6:58-7:6 may support an argument that the term is limited to the core processing and memory components of a microcontroller-like system, not just any clocked logic.

'145 Patent, Claim 10

  • The Term: "deactivating one of the first and second signals"
  • Context and Importance: The core of this method claim is the active "deactivating" of one signal path to prevent crosstalk before it reaches the final multiplexing gate. This is distinct from a simple passive multiplexer that just selects one active signal over another. The infringement analysis will likely turn on whether the accused cards' circuitry performs this specific deactivation step as claimed.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: A party might argue that any method that results in only one signal being transmitted constitutes "deactivating" the other, even if it is a standard multiplexing function.
    • Evidence for a Narrower Interpretation: The specification describes supplying a "static control signal to the first and second logic gates, ensuring that only one active signal... is supplied to the inputs" '145 Patent, col. 3:22-25 This language suggests a specific mechanism of actively disabling one of the input logic gates, which may support a narrower construction than a generic signal selection process.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges induced infringement for all asserted patents. The factual basis alleged is that Defendant provides instruction materials, training, services, advertising, and distribution for the Accused Instrumentalities, which allegedly aid and abet infringement by partners, customers, and end users Compl. ¶49 Compl. ¶59 Compl. ¶69 Compl. ¶79 Compl. ¶89
  • Willful Infringement: The complaint alleges that Defendant's infringement became willful for each patent as of the date it received notice of the complaint, based on alleged post-suit knowledge Compl. ¶50 Compl. ¶60 Compl. ¶70 Compl. ¶80 Compl. ¶90

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

  1. Technological Mismatch: The central issue will be one of applicability: do the accused contactless credit cards-typically low-power, specialized integrated circuits-actually practice the relatively complex and varied semiconductor technologies described across the seven patents-in-suit, which relate to microcontroller power management, high-performance signal processing, and extensible communication interfaces?

  2. Evidentiary Basis for Infringement: A key threshold question will be pleading sufficiency: does the complaint, by asserting infringement of a specific claim by a product category without providing any factual allegations or claim charts to connect the technology to the product, provide a plausible basis for the infringement claims, or will it be found deficient at the pleading stage?

  3. Scope of Damages for Expired Patents: For the '500 and '465 patents, a key question will be the temporal scope of liability. Plaintiff has limited its claims to the period before patent expiration Compl. ¶96 Compl. ¶101 The litigation will need to establish the extent, if any, of infringing activity by Defendant's accused products specifically within those historical time windows.

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