Fall Line Patents LLC v. Quest Diagnostics Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Fall Line Patents, LLC (Oklahoma)
  • Defendant: Quest Diagnostics Incorporated and Quest Diagnostics Clinical Laboratories, Inc. (Delaware)
  • Plaintiff's Counsel: Antonelli, Harrington & Thompson LLP
• Case Identification: 5:26-cv-00085, E.D. Tex., 06/30/2026
• Venue Allegations: Plaintiff alleges venue is proper in the Eastern District of Texas because Defendant transacts business in the district, offers the accused product for use there, and maintains multiple regular and established places of business within the district.
• Core Dispute: Plaintiff alleges that Defendant's MyQuest Mobile App, used in conjunction with its servers, infringes a patent related to systems and methods for managing and collecting data from remote computing devices, particularly through location-specific questionnaires.
• Technical Context: The technology addresses the challenges of developing data-collection applications for a fragmented market of early handheld computing devices by using a device-independent, token-based system that can be updated incrementally and operate over intermittent network connections.
• Key Procedural History: The complaint highlights that in prior litigation involving the same patent (Fall Line Patents, LLC v. Zoe's Kitchen, Inc.), the court denied a motion to dismiss on patent eligibility grounds and later granted summary judgment of validity under 35 U.S.C. § 101. The patent-in-suit has also survived an inter partes review (IPR) proceeding (IPR2019-00610), which confirmed the patentability of the asserted claim, while other claims were canceled in that and another IPR proceeding (IPR2018-00043).

Case Timeline

Date	Event
2002-08-19	'748 Patent Priority Date
2016-09-27	'748 Patent Issue Date
2017-10-06	IPR2018-00043 filed against '748 Patent
2019-01-22	IPR2019-00610 filed against '748 Patent
2021-05-25	Prior litigation: Motion to dismiss on § 101 grounds denied
2022-12-19	IPR Certificate issued confirming patentability of Claim 7
2023-06-29	Prior litigation: Summary judgment of validity under § 101 granted
2023-08-22	IPR Certificate issued canceling claims 16-18
2026-06-30	Complaint Filing Date

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, "System and Method for Data Management," issued September 27, 2016.

The Invention Explained

• Problem Addressed: The patent's background section describes the technical difficulties of developing data collection applications for early-2000s handheld computers Compl. ¶¶23-24 These problems included software incompatibility across different device manufacturers, the need to recompile and reinstall an entire application to make a single change, and the unreliability of network connections in the field '748 Patent, col. 1:49-2:2 '748 Patent, col. 3:7-10 '748 Patent, col. 3:64-67
• The Patented Solution: The invention proposes a system using "device-independent tokens" to create a "questionnaire" that can run on any supported device without custom compilation Compl. ¶26 '748 Patent, col. 5:21-26 This tokenized structure allows for incremental updates and is designed for "loosely networked" environments, where data is stored locally if a network is unavailable and transmitted later '748 Patent, col. 5:7-12 The system also integrates GPS to automatically collect location information and customize questionnaires for specific locations Compl. ¶28 '748 Patent, col. 10:55-65
• Technical Importance: This approach sought to create a universal framework for deploying and managing mobile data collection applications, reducing development costs and improving data timeliness by overcoming device fragmentation and network limitations Compl. ¶¶8-9

Key Claims at a Glance

• The complaint asserts direct and indirect infringement of Claim 7 '748 Patent, col. 14:48-15:6 Compl. ¶12 Compl. ¶¶16-17
• Independent Claim 7 is a method claim with the following key elements:
  • Designing a questionnaire customized for a particular location, with branching logic and at least one question requesting location information.
  • Automatically transferring the questionnaire to a "loosely networked computer" that has an "integral" GPS.
  • Executing the questionnaire at the particular location to collect responses from a user.
  • Using the GPS to automatically provide location information 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.

III. The Accused Instrumentality

Product Identification

The complaint identifies the accused instrumentalities as "Quest Diagnostics mobile apps that, in conjunction with Quest Diagnostics servers," with the "MyQuest Mobile App" being specifically named Compl. ¶5 Compl. ¶11

Functionality and Market Context

• The complaint alleges the accused system is used to "create and execute a location-specific questionnaire to collect responses from users" Compl. ¶11
• Functionally, the MyQuest Mobile App is described as a tool to "direct customers to, and receive requests for test results, lab appointments, etc. from customers for, one or more Quest Diagnostics locations in this district" Compl. ¶6 This frames the app's location-based service of finding nearby labs as the infringing "location-specific questionnaire."
• No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint alleges infringement of Claim 7 but does not provide a detailed claim chart. The following table summarizes the infringement theory based on the narrative 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... wherein at least one of said at least one questions requests location identifying information	Defendant provides a "location-specific questionnaire" through its MyQuest Mobile App and associated servers. The complaint does not specify how the questionnaire is designed or what branching logic is used.	¶11	col. 14:49-56
(b) automatically transferring said designed questionnaire to at least one loosely networked computer having a GPS integral thereto	Defendant's customers download the MyQuest Mobile App to their mobile devices (the "loosely networked computer"), which have integrated GPS capabilities.	¶15	col. 14:57-60
(c) when said loosely networked computer is at said particular location, executing said transferred questionnaire on said loosely networked computer, thereby collecting responses from the user	End-users use the app on their mobile devices to interact with the system, such as finding lab locations or requesting test results, which constitutes executing the questionnaire and collecting responses.	¶11; ¶15	col. 14:61-65
(d) while said transferred questionnaire is executing, using said GPS to automatically provide said location identifying information as a response to said executing questionnaire	The system is alleged to be "location-specific," implying the use of the mobile device's GPS to identify the user's location as part of the app's functionality.	¶11	col. 15:1-4
(e) automatically transferring via the loose network any responses so collected in real time to a central computer	The MyQuest Mobile App operates "in conjunction with Quest Diagnostics servers," which implies that data collected from the user (the "responses") is transferred from the mobile device to Defendant's central servers.	¶11	col. 15:5-8
(f) making available via the Internet any responses transferred to said central computer in step (e)	The complaint does not provide sufficient detail for analysis of this element. It alleges the system receives requests for test results and appointments but does not describe how responses are made available via the Internet.	¶6	col. 15:9-11

• Identified Points of Contention:
  • Scope Question: A central issue may be whether the MyQuest app's feature for finding nearby labs and managing appointments constitutes a "questionnaire" with "branching logic" as contemplated by the patent. The patent's examples focus on multi-part surveys, such as for a "mystery shopper" '748 Patent, col. 10:37-43, which raises the question of whether a simple location-based service lookup falls within the claim's scope.
  • Technical Question: The complaint alleges the system is "location-specific" Compl. ¶11, but it does not specify how the device's GPS provides location information "as a response" to the questionnaire, as required by claim 7(d). The infringement analysis may turn on whether the app's general use of location services meets this specific claim limitation.

V. Key Claim Terms for Construction

• The Term: "questionnaire"

• Context and Importance: The entire infringement theory rests on construing the accused app's functionality as a "questionnaire." Its definition will be critical. Practitioners may focus on this term because the patent's detailed examples of complex, multi-step surveys appear distinct from the alleged functionality of finding a lab location.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The patent uses the terms "program" and "form" interchangeably with "questionnaire" '748 Patent, col. 8:39-41, which may support an argument that any structured method of data collection is covered.
  • Evidence for a Narrower Interpretation: The specification's primary embodiment describes a highly detailed "mystery shopper" survey with multiple timers, conditional questions, and specific tasks '748 Patent, col. 10:37 - col. 11:23 This detailed example, along with the claim's requirement for "branching logic," could support a narrower construction limited to more complex, survey-like interactions.

• The Term: "customized for a particular location"

• Context and Importance: This term is key to the infringement allegation that the app provides a "location-specific questionnaire" Compl. ¶11 The dispute may focus on whether this requires the questionnaire's content to be location-dependent or merely that it is used at a specific location.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The claim language could be read to cover any questionnaire that is designed to be executed at a certain location, regardless of whether the questions themselves change.
  • Evidence for a Narrower Interpretation: The patent describes creating questionnaires for particular purposes, such as rating a specific franchisee or restaurant `'748 Patent, col. 10:37-54), suggesting the customization is tied to the substance of the inquiries for that location.

VI. Other Allegations

• Indirect Infringement: The complaint alleges inducement by asserting Defendant provides instructions and promotes the use of the accused app with the specific intent to cause infringement by its customers Compl. ¶16 It also alleges contributory infringement, claiming the app has special features with no substantial non-infringing use Compl. ¶17
• Willful Infringement: The willfulness allegation is based on alleged post-suit knowledge of the '748 Patent Compl. ¶18 and, alternatively, on a theory of willful blindness arising from a purported corporate policy of not reviewing the patents of others Compl. ¶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 detailed, multi-step surveys with "branching logic," be construed to cover the accused app's function of finding nearby medical laboratories and managing appointments?
• A key evidentiary question will be one of technical mapping: does the complaint provide sufficient factual allegations to plausibly show that the accused app performs the specific functions required by Claim 7, such as using GPS data "as a response" to a query and operating on a "loose network" with the specific store-and-forward capability described in the patent?
• A central theme of the case may involve the level of abstraction: given that Claim 7 survived both a § 101 challenge and an IPR, the dispute will likely shift from validity to infringement, focusing on whether the concrete functionality of the accused product can be plausibly mapped onto the patent's more abstractly claimed method steps.