DCT

5:26-cv-00085

Fall Line Patents LLC v. Quest Diagnostics Inc

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Amended Complaint
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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 5:26-cv-00085, E.D. Tex., 09/30/2026
  • Venue Allegations: Plaintiff alleges venue is proper because Defendant transacts business, has committed acts of infringement, and maintains a regular and established place of business in the district.
  • Core Dispute: Plaintiff alleges that Defendant’s MyQuest Mobile App and associated server infrastructure infringe a patent related to methods for managing and collecting data from remote, location-aware computing devices.
  • Technical Context: The technology addresses challenges in developing data collection applications for handheld devices, specifically overcoming software incompatibility across different hardware platforms and managing data transfer over intermittent networks.
  • Key Procedural History: The complaint notes that the patent-in-suit has been subject to prior litigation, resulting in a denial of a motion to dismiss on patent eligibility grounds and a summary judgment of validity under 35 U.S.C. § 101. The patent has also survived an inter partes review (IPR) proceeding where the asserted claim, Claim 7, was found patentable, while other claims were canceled.

Case Timeline

Date Event
2002-08-19 Earliest Priority Date for U.S. Patent No. 9,454,748
2016-09-27 U.S. Patent No. 9,454,748 Issued
2021-05-25 Court Order in prior litigation denying motion to dismiss on § 101 grounds
2022-12-19 IPR Certificate issued for IPR2019-00610, confirming patentability of Claim 7
2023-06-29 Court Order in prior litigation granting summary judgment of validity under § 101
2023-08-22 IPR Certificate issued for IPR2018-00043, canceling claims 16-18
2026-09-30 Complaint Filed

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

U.S. Patent No. 9,454,748 - "System and Method for Data Management"

  • Patent Identification: U.S. Patent No. 9,454,748 ("the ’748 Patent"), "System and Method for Data Management," issued September 27, 2016.

The Invention Explained

  • Problem Addressed: In the early 2000s, creating software for the diverse landscape of handheld computers was difficult Compl. ¶22 Applications developed for one device were often incompatible with others, requiring costly custom programs for each platform ’748 Patent, col. 1:49-2:2 Furthermore, developers had to recompile and reinstall an entire application to make even a single change ’748 Patent, col. 3:7-10 These devices also suffered from intermittent network connectivity, making real-time data transfer unreliable ’748 Patent, col. 3:64-4:1
  • The Patented Solution: The invention describes a system to overcome these issues by creating "device indifferent tokens" that represent a "questionnaire" ’748 Patent, col. 13:52-55 This tokenized structure allows a single questionnaire to be executed on various devices and updated incrementally without a full reinstallation Compl. ¶25 The system also introduces the concept of a "loosely networked" environment, where data is stored locally on the device if a network is unavailable and transmitted automatically when the connection is restored ’748 Patent, col. 5:7-12 The patent further describes using an integrated GPS to automatically collect location data and customize the questionnaire for a specific location ’748 Patent, col. 10:55-65
  • Technical Importance: This approach enabled the development of scalable, cross-platform mobile data collection applications that were robust to network interruptions, a significant advance over prior art methods that were device-specific or relied on constant connectivity Compl. ¶¶25-27

Key Claims at a Glance

  • The complaint asserts independent Claim 7 of the ’748 Patent Compl. ¶12
  • The essential elements of Claim 7 are:
    • A method for collecting survey data and making it available online, comprising:
    • Designing a questionnaire customized for a particular location with branching logic.
    • Automatically transferring the questionnaire to a "loosely networked computer" with an integrated GPS.
    • Executing the questionnaire on the device when it is at the particular location to collect user responses.
    • Automatically providing the device's location information from the GPS as a response while the questionnaire is executing.
    • Automatically transferring collected responses in real time over the "loose network" to a central computer.
    • Making the transferred responses available via the Internet.

No probative visual evidence provided in complaint.

III. The Accused Instrumentality

Product Identification

  • The "MyQuest Mobile App" operating in conjunction with "Quest Diagnostics servers" Compl. ¶11

Functionality and Market Context

  • The complaint alleges that the accused system allows Quest Diagnostics to "create and execute a location-specific questionnaire to collect responses from users" Compl. ¶11 The MyQuest Mobile App is also described as a tool used by customers to find Quest Diagnostics locations, get test results, and schedule lab appointments Compl. ¶6 The complaint does not provide specific technical details on the app's architecture or how it handles data, but frames its functionality as a location-aware data collection and management system.

IV. Analysis of Infringement Allegations

’748 Patent Infringement Allegations

Claim Element (from Independent Claim 7) Alleged Infringing Functionality Complaint Citation Patent Citation
(a) designing a questionnaire including at least one question said questionnaire customized for a particular location having branching logic on a first computer platform... Quest Diagnostics, through its servers, creates a "location-specific questionnaire." ¶11 col. 8:40-45
(b) automatically transferring said designed questionnaire to at least one loosely networked computer having a GPS integral thereto; Quest Diagnostics distributes its "mobile apps" (the MyQuest app) to end-users' smartphones, which are the "loosely networked computer[s] having a GPS." ¶11 col. 9:3-6
(c) when said loosely networked computer is at said particular location, executing said transferred questionnaire... collecting responses from the user; The MyQuest app, in conjunction with servers, "execute[s] a location-specific questionnaire to collect responses from users." ¶11 col. 9:38-44
(d) while said transferred questionnaire is executing, using said GPS to automatically provide said location identifying information as a response... The system uses the device's location to provide location-specific features, such as directing customers to nearby Quest Diagnostics facilities. ¶6 col. 10:55-59
(e) automatically transferring via the loose network any responses so collected in real time to a central computer; The MyQuest app communicates with Quest Diagnostics servers to transfer user data and requests. ¶11 col. 5:7-12
(f) making available via the Internet any responses transferred to said central computer in step (e). The system is used to "receive requests for test results, lab appointments, etc." from customers, making the collected information accessible. ¶6 col. 10:10-14
  • Identified Points of Contention:
    • Scope Questions: The case may turn on whether the functionality of the MyQuest app, which appears to be a patient portal for scheduling and viewing results Compl. ¶6, can be properly characterized as a "questionnaire" with "branching logic" as contemplated by the patent. The patent's examples focus on survey-style data collection, such as for a "mystery shopper" ’748 Patent, col. 9:38-54 This raises the question of whether the term "questionnaire" reads on the accused app's user interface.
    • Technical Questions: The complaint alleges the system is "location-specific" but provides no detail on whether the MyQuest app uses GPS data as a response to a prompt within the application flow, as required by claim 7(d). A key question will be whether simply using location to find a nearby lab meets this specific claim limitation.
    • Technical Questions: The patent defines "loosely networked" as a system capable of storing data locally and transmitting it later when a connection is restored ’748 Patent, col. 5:10-12 It is an open question whether the MyQuest app implements this specific store-and-forward functionality or if it requires a persistent live network connection to operate.

V. Key Claim Terms for Construction

  • The Term: "questionnaire"

    • Context and Importance: This term is central to the dispute. The infringement theory depends on whether the accused app’s user interface for scheduling appointments or providing patient information constitutes a "questionnaire." Practitioners may focus on this term because its scope will likely determine whether the patent applies to patient service applications or is limited to survey and field-data collection tools.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The patent states that the terms "program" and "form" are used interchangeably with "questionnaire" ’748 Patent, col. 8:35-39, which could support an interpretation that covers any structured data input interface.
      • Evidence for a Narrower Interpretation: The detailed description and examples heavily feature survey-like applications, such as a "mystery shopper" form with questions about service quality ’748 Patent, col. 9:38-11:22, suggesting the term implies a series of explicit prompts designed to elicit subjective or observational data.

  • The Term: "loosely networked"

    • Context and Importance: This term defines a critical aspect of the system's architecture. The analysis will question whether modern mobile apps that may buffer data but generally assume connectivity meet the patent's specific definition.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The term could be argued to cover any system operating over a non-guaranteed connection, such as a cellular network, that is inherently "intermittent."
      • Evidence for a Narrower Interpretation: The specification provides a precise definition: "if a network connection is unavailable at that moment, the information is temporarily stored in the device and later transmitted when the connection is restored" ’748 Patent, col. 5:10-12 This points to a specific store-and-forward capability for offline operation, which may be narrower than general operation over a cellular network.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges inducement by asserting that Defendant provides the MyQuest app and directs or advises customers on how to use it in an infringing manner Compl. ¶16 It also alleges contributory infringement, stating the accused products have "special features" with no substantial non-infringing use that are a "material part of the invention" Compl. ¶17
  • Willful Infringement: Willfulness is alleged based on Defendant's purported "policy or practice of not reviewing the patents of others," which Plaintiff characterizes as willful blindness, and on conduct that was allegedly objectively reckless Compl. ¶¶18-19

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

  • A core issue will be one of definitional scope: can the term "questionnaire", rooted in the patent's context of customizable surveys and field data collection, be construed to cover the patient service functions (e.g., appointment scheduling, viewing results) of the accused "MyQuest Mobile App"?
  • A key evidentiary question will be one of technical implementation: does the plaintiff have evidence that the accused system performs the specific functions required by the claim, namely, (1) using GPS data as an automatic response to a prompt within the application, as opposed to merely for mapping, and (2) employing the "store-and-forward" mechanism that defines a "loosely networked" system in the patent?
  • A third area of focus may be patent validity, despite Claim 7's survival of an IPR. A central question is whether Defendant can present new prior art or invalidity arguments compelling enough to overcome the deference that may be given to the PTO's prior review and the validity finding in previous litigation cited in the complaint.