Induction Devices LLC v. Marriott Intl Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Induction Devices LLC (Texas)
  • Defendant: Marriott International, Inc. (Delaware)
  • Plaintiff's Counsel: Shea | Beaty PLLC
• Case Identification: 2:26-cv-00195, E.D. Tex., 03/10/2026
• Venue Allegations: Plaintiff alleges venue is proper in the Eastern District of Texas because Defendant maintains a place of business in Plano, Texas, within the district.
• Core Dispute: Plaintiff alleges that Defendant induces the infringement of five U.S. patents relating to semiconductor design and operation through its provision and support of branded contactless consumer credit cards.
• Technical Context: The patents-in-suit relate to foundational semiconductor technologies, including circuit reset logic, signal multiplexing, secure memory for NFC transactions, asynchronous communication, and digital signal processing.
• Key Procedural History: The complaint notes that U.S. Patent No. 7,899,145 was previously litigated in the Western District of Texas in 2021, but those cases were resolved before any substantive matters were addressed.

Case Timeline

Date	Event
2005-09-02	U.S. Patent No. 7,899,145 Priority Date
2006-01-26	U.S. Patent No. 7,449,926 Priority Date
2006-12-21	U.S. Patent No. 8,190,885 Priority Date
2007-03-09	U.S. Patent No. 8,370,543 Priority Date
2007-04-17	U.S. Patent No. 8,543,628 Priority Date
2008-11-11	U.S. Patent No. 7,449,926 Issues
2011-03-01	U.S. Patent No. 7,899,145 Issues
2012-05-29	U.S. Patent No. 8,190,885 Issues
2013-02-05	U.S. Patent No. 8,370,543 Issues
2013-09-24	U.S. Patent No. 8,543,628 Issues
2021-XX-XX	Prior litigation involving the '145 patent is initiated
2026-03-10	Complaint Filed

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

I. U.S. Patent No. 7,449,926 - "Circuit for Asynchronously Resetting Synchronous Circuit," issued November 11, 2008 (the "'926 Patent")

The Invention Explained

• Problem Addressed: The patent's background describes a conflict in resetting synchronous circuits like memories (RAMs). An asynchronous reset can corrupt stored data during normal operation, but is necessary for immediate initialization if the circuit begins operating abnormally, for example due to a power supply voltage decrease '926 Patent, col. 1:24-44
• The Patented Solution: The invention is a reset signal generation circuit that includes an "operation detection circuit" to monitor a synchronous component, such as a CPU '926 Patent, col. 4:12-14 This detection circuit generates a signal indicating if the component is operating "normally" or "abnormally." A control circuit then uses this state information to selectively generate either a data-preserving synchronous reset signal during normal operation or an immediate asynchronous reset signal during abnormal operation Compl. ¶11 '926 Patent, col. 6:58-7:6
• Technical Importance: This selective reset capability enhances the reliability of semiconductor devices by safely managing routine resets while providing a robust failure-recovery mechanism '926 Patent, abstract Compl. ¶11

Key Claims at a Glance

• The complaint asserts at least independent Claim 1 Compl. ¶33
• Essential elements of Claim 1 include:
  • A reset signal generation circuit for a synchronous circuit.
  • An "operation detection circuit" for detecting whether the synchronous circuit is operating normally or abnormally and generating an "operation detection signal."
  • A "signal control circuit" that generates a first reset signal.
  • The signal control circuit generates a synchronous reset signal when the circuit operates normally.
  • The signal control circuit generates an asynchronous reset signal when the circuit operates abnormally.

II. U.S. Patent No. 7,899,145 - "Circuit, System, and Method for Multiplexing Signals with Reduced Jitter," issued March 1, 2011 (the "'145 Patent")

The Invention Explained

• Problem Addressed: In high-speed circuits, when a multiplexer selects between different clock signals, the proximity of the signal paths can introduce electrical interference ("crosstalk") and power supply noise. This interference creates timing instability known as "jitter," which can degrade system performance and cause errors '145 Patent, col. 2:60-67 Compl. ¶16
• The Patented Solution: The patent describes a multiplexer architecture where the logic gates that handle the different input signals are arranged within "separate power domains." A logic block deactivates all but one of the input signals by supplying a static control signal. This ensures that only one active signal is propagating through the circuit at a time, which eliminates crosstalk at the gate inputs and reduces jitter Compl. ¶17 '145 Patent, col. 3:13-28
• Technical Importance: The solution provides a method for cleaner signal multiplexing in high-frequency applications, which is critical for maintaining timing integrity in complex modern electronics Compl. ¶15

Key Claims at a Glance

• The complaint asserts at least independent Claim 10 Compl. ¶43
• Essential elements of Claim 10 include:
  • A system comprising a circuit with two logic gates, a first logic block, and a second logic block.
  • Each of these components is "arranged within a separate power supply domain."
  • A first logic gate is coupled to a first signal, and a second logic gate is coupled to a second signal.
  • A second logic block is coupled to one of the signals based on a control signal.
  • A system component is coupled to the second logic block.

III. Multi-Patent Capsule: U.S. Patent No. 8,190,885

• Patent Identification: U.S. Patent No. 8,190,885, "Non-Volatile Memory Sub-System Integrated with Security for Storing Near Field Transactions," issued May 29, 2012 (the "'885 Patent").
• Technology Synopsis: The patent describes a secure memory module for Near Field Communication (NFC) transactions. It integrates non-volatile memory, a security processor, and an NFC radio frequency component to create a secure environment for storing and processing transaction data, protecting it from unauthorized access and ensuring data integrity Compl. ¶¶21-22
• Asserted Claims: At least independent Claims 1 and 3 Compl. ¶53
• Accused Features: The complaint alleges that branded contactless consumer credit cards contain the integrated secure memory architecture for handling NFC transactions Compl. ¶53

IV. Multi-Patent Capsule: U.S. Patent No. 8,370,543

• Patent Identification: U.S. Patent No. 8,370,543, "Busy Detection Logic for Asynchronous Communication Port," issued February 5, 2013 (the "'543 Patent").
• Technology Synopsis: The patent addresses synchronizing access to a resource between components operating in different clock domains. The invention provides a system for communicating resource availability ("busy" status) without requiring high-speed clocks or imposing minimum pulse width requirements on control signals, thereby improving design and performance efficiency Compl. ¶¶25-27
• Asserted Claims: At least independent Claim 16 Compl. ¶63 Compl. ¶70
• Accused Features: The complaint alleges that branded contactless consumer credit cards utilize the claimed synchronization logic for communication between internal components operating in different time domains Compl. ¶63

V. Multi-Patent Capsule: U.S. Patent No. 8,543,628

• Patent Identification: U.S. Patent No. 8,543,628, "Method and System of Digital Signal Processing," issued September 24, 2013 (the "'628 Patent").
• Technology Synopsis: The patent is directed to a programmable system on a chip with a dynamically reconfigurable digital filtering system. Instruction sets from a microcontroller configure an address-calculation device to select filter coefficients, which a data path device then uses to perform digital signal processing on incoming data Compl. ¶30
• Asserted Claims: At least independent Claim 1 Compl. ¶73
• Accused Features: The complaint alleges that branded contactless consumer credit cards incorporate the claimed reconfigurable digital signal processing system Compl. ¶73

III. The Accused Instrumentality

I. Product Identification

• The accused instrumentalities are "branded contactless consumer credit cards" that Plaintiff alleges are provided and supported by Defendant Marriott Compl. ¶33

II. Functionality and Market Context

• The complaint alleges these are "contactless consumer credit cards" used by Defendant's partners, clients, customers, and end users Compl. ¶33 Compl. ¶35 The complaint does not provide specific technical details about the internal components or operation of the cards. The infringement theory is based on inducement, stemming from Defendant's alleged role in providing, supporting, advertising, and distributing the cards Compl. ¶38 No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint references, but does not attach, exemplary infringement analysis charts for each asserted patent Compl. ¶34 Compl. ¶44 Compl. ¶54 Compl. ¶64 Compl. ¶74 In the absence of these exhibits, the infringement theory is summarized below based on the complaint's narrative allegations.

I. '926 Patent Infringement Allegations

• The complaint alleges that the accused credit cards contain synchronous circuits that require resetting. It asserts these cards include an "operation detection circuit" that distinguishes between normal and abnormal operating states to selectively generate either a synchronous or asynchronous reset signal, thereby mapping to the elements of Claim 1 Compl. ¶34

II. '145 Patent Infringement Allegations

• The complaint alleges the accused credit cards contain circuits for multiplexing signals. It asserts these circuits are built with logic gates arranged in "separate power supply domains" and are controlled by a logic block that deactivates one signal to prevent interference, thereby infringing the system claimed in Claim 10 Compl. ¶44

III. Identified Points of Contention

• Evidentiary Questions: A central issue will be whether discovery confirms that the accused credit cards, which are not manufactured by the Defendant, contain the specific and relatively complex circuit architectures required by the claims. The complaint is filed on "information and belief" and lacks specific evidence of the cards' internal designs Compl. ¶33
• Technical Questions ('926 Patent): What evidence does the complaint provide that the accused cards' reset functionality goes beyond a simple power-on or low-voltage reset, and instead includes an "operation detection circuit" that actively distinguishes between "normal" and "abnormal" operation to select a reset type as required by the claim?
• Scope Questions ('145 Patent): A key question will be whether the multiplexing circuitry in the accused cards, if any, is architected with logic gates in "separate power supply domains" as claimed, or if it utilizes a conventional, integrated design that would not read on the claim.

V. Key Claim Terms for Construction

I. The Term: "operation detection circuit for detecting whether the synchronous circuit is operating normally or abnormally" ('926 Patent, Claim 1)

• Context and Importance: This term is the central inventive concept of Claim 1. The infringement analysis will depend on whether this term is construed to cover common circuits, such as a simple voltage detector, or if it is limited to more complex circuits that monitor program execution.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification states the circuit "generates an operation detection signal OC showing the detection result" '926 Patent, col. 4:15-17, language that may support a broader reading covering any circuit that detects a condition indicative of abnormal operation.
  • Evidence for a Narrower Interpretation: An embodiment describes the circuit as an up-counter periodically cleared by the CPU; failure to clear the counter indicates abnormal operation '926 Patent, col. 4:18-40 Defendant may argue the term should be limited to embodiments that monitor the CPU's program flow.

II. The Term: "each arranged within a separate power supply domain" ('145 Patent, Claim 10)

• Context and Importance: This structural limitation is critical to the patent's claimed solution for reducing jitter. The dispute will likely focus on the required degree of physical and electrical separation.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification refers to arranging logic gates within different power supply "islands," each coupled to a different power bus, which could suggest that separate power traces on the same die are sufficient '145 Patent, col. 3:32-34
  • Evidence for a Narrower Interpretation: The patent also states that components in separate domains are "physically separated" '145 Patent, col. 6:51-52 and mentions the use of "supply guard rings for further isolation" '145 Patent, col. 6:59-60, which may support a narrower construction requiring more substantial isolation than simply using different power rails.

VI. Other Allegations

I. Indirect Infringement

• The complaint alleges induced infringement for all five patents Compl. ¶33 Compl. ¶43 Compl. ¶53 Compl. ¶63 Compl. ¶73 The alleged inducing acts include Defendant's "provision and support," "advertising and distributing," and providing "instruction materials, training, and services" regarding the accused credit cards, done with alleged specific intent or willful blindness Compl. ¶38

II. Willful Infringement

• The complaint alleges willful infringement for all five patents based on knowledge acquired no earlier than the filing of the complaint itself. It alleges that Defendant's inducement "has been willful" since the date of filing Compl. ¶39 Compl. ¶49 Compl. ¶59 Compl. ¶69 Compl. ¶79 No pre-suit knowledge is alleged.

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

• A primary issue will be one of architectural correspondence: will discovery reveal that the internal circuitry of the accused third-party contactless credit cards actually implements the specific, and in some cases non-standard, architectures required by the asserted patents, such as the selective reset logic of the '926 Patent or the distributed multiplexer of the '145 Patent?
• A key legal question will be one of induced infringement: can Plaintiff establish that Defendant, by providing and supporting credit cards it does not manufacture, possessed the specific intent required to encourage its customers and partners to directly infringe the patents, or will its actions be viewed as standard commercial activity without the requisite intent for inducement?
• The case may also turn on a question of definitional scope: can terms like "operation detection circuit" ('926 Patent) and "separate power supply domain" ('145 Patent) be construed broadly enough to read on the potentially more conventional circuit designs that may be found within mass-market consumer credit cards?