Avant Location Tech LLC v. ADT Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Avant Location Technologies LLC (Texas)
  • Defendant: ADT Inc. and Adt LLC (Delaware)
  • Plaintiff's Counsel: Fabricant, Rubino & Lambrianakos LLP; THE DAVIS FIRM PC
• Case Identification: 2:26-cv-00011, E.D. Tex., 04/13/2026
• Venue Allegations: Plaintiff alleges venue is proper based on Defendant ADT Inc. and ADT LLC maintaining a regular and established place of business in the Eastern District of Texas, including offices in Tyler and Beaumont, and having committed acts of infringement in the District.
• Core Dispute: Plaintiff alleges that Defendant's smart home security systems and associated mobile applications, which utilize geofencing technology, infringe five patents related to methods for monitoring the presence of a mobile device within a defined special area.
• Technical Context: The technology at issue involves location-based services, specifically geofencing, where a virtual boundary triggers automated actions in smart home devices based on a user's mobile device entering or exiting the area.
• Key Procedural History: The complaint notes that the five patents-in-suit are related and were developed by the same inventor, originating from a common European patent application. No prior litigation, licensing, or post-grant proceedings are mentioned in the complaint.

Case Timeline

Date	Event
2006-03-28	Priority Date for all Patents-in-Suit
2014-05-27	U.S. Patent No. 8,738,040 Issued
2015-08-25	U.S. Patent No. 9,119,030 Issued
2016-11-01	U.S. Patent No. 9,485,621 Issued
2017-04-11	U.S. Patent No. 9,622,032 Issued
2018-06-26	U.S. Patent No. 10,009,720 Issued
2026-04-13	Complaint Filing Date

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

U.S. Patent No. 8,738,040 - "Method and System for Monitoring a Mobile Station Presence in a Special Area"

The Invention Explained

• Problem Addressed: The patent's background describes a lack of flexibility in prior art systems, which required modification of "guide units" (i.e., radio transmitters) to add new "special areas" for monitoring the presence of a mobile device '040 Patent, col. 1:65-2:3
• The Patented Solution: The invention proposes a method where a mobile network can associate a new special area with a mobile station by transmitting "checking data" to the device. The mobile station stores this data and uses it to determine for itself whether signals it receives define a special area, thus allowing new zones to be added without modifying radio hardware '040 Patent, col. 2:44-57 This provides flexibility to activate special operating modes for a mobile device within a defined area '040 Patent, abstract
• Technical Importance: The described approach decouples the definition of a special area from the fixed hardware broadcasting signals, allowing for dynamic, software-defined location-based services.

Key Claims at a Glance

• The complaint asserts infringement of at least Claim 1 '040 Patent, claim 1 Compl. ¶51
• The essential elements of independent Claim 1 include:
  • A radio device repeatedly transmitting a "radio distinctive defining signal" that defines a special area.
  • A "mobile station" observing the channel and processing received signals to determine if it is receiving a defining signal.
  • The mobile station processing the signal to determine if it is a "distinctive" defining signal and thereby determining if it is present in a special area.
  • The mobile station sending an "updating signal" to a mobile telephone network about its presence, where this signal is uncorrelated to phone call establishment.
  • The network routing the updating signal to "special operating means" that adapt an operating parameter.
  • Associating the special area with the mobile station by transmitting "checking data" to it, which the mobile station uses to identify the "distinctive defining signal."

U.S. Patent No. 10,009,720 - "Method and System for Monitoring a Mobile Station Presence in a Special Area"

The Invention Explained

• Problem Addressed: The patent addresses the same deficiency as the '040 Patent: prior art systems lack the flexibility to allow a mobile network to add one or more special monitoring areas without modifying the radio transmitters in those areas '720 Patent, col. 1:62-2:1
• The Patented Solution: The invention describes a method where a mobile station receives and processes a "distinctive defining signal" that defines a special area. The signal contains information indicating whether the radio device is in a "predetermined environment." The mobile station then sends an updating signal to servers of a presence-related service provider, which can use the signal to adjust an operating parameter such as a tariff or service flag '720 Patent, abstract '720 Patent, col. 2:15-31
• Technical Importance: This method provides a framework for a third-party service provider (distinct from the mobile network operator) to offer location-aware services by leveraging signals that define a user's context (e.g., at home).

Key Claims at a Glance

• The complaint asserts infringement of at least Claim 1 '720 Patent, claim 1 Compl. ¶68
• The essential elements of independent Claim 1 include:
  • Receiving and processing a "distinctive defining signal" in a mobile station, which defines a special area.
  • The signal including information indicating whether the "radio communication defining device" is in a "predetermined environment."
  • Sending an "updating signal" from the mobile station via a mobile telephone network to servers of a "provider of presence related services."
  • The updating signal being usable by the servers to adjust an operating parameter (e.g., a tariff or service flag) to adjust, activate, or deactivate the presence-related services.
  • The updating signal comprising the information indicating whether the radio device is in the predetermined environment.

U.S. Patent No. 9,119,030 - "Method and System for Monitoring a Mobile Station Presence in a Special Area"

• Technology Synopsis: This patent focuses on a server-side method for providing presence-related services. The method involves storing data linking a mobile station to a special area, receiving an updating signal from the mobile station about its presence, and using that signal to enable or disable a presence-related service '030 Patent, abstract
• Asserted Claims: At least Claim 1 Compl. ¶84
• Accused Features: The complaint alleges that ADT's servers, which receive location status updates from users' mobile apps to trigger automations (e.g., arming reminders), practice the claimed method Compl. ¶¶86-87

U.S. Patent No. 9,485,621 - "Method and System for Monitoring a Mobile Station Presence in a Special Area"

• Technology Synopsis: This patent describes a method from the perspective of a "provider of presence related services" that is different from the mobile telephone network. The provider's servers electronically store data linking the mobile station to a special area, receive an updating signal from the mobile station, and derive the station's presence to enable or disable a service '621 Patent, abstract
• Asserted Claims: At least Claim 1 Compl. ¶99
• Accused Features: The complaint alleges ADT, as a presence service provider separate from the cellular carrier, infringes by operating servers that store geofence data, receive updates from the ADT app, and enable/disable services like home automation rules Compl. ¶¶100-102

U.S. Patent No. 9,622,032 - "Method and System for Monitoring a Mobile Station Presence in a Special Area"

• Technology Synopsis: This patent details a method where a mobile station stores "first checking data" to identify a special area, sends an updating signal to a provider's servers, and the servers then store an operating parameter and can send "second checking data" back to the mobile station to modify the special area '032 Patent, abstract
• Asserted Claims: At least Claim 1 Compl. ¶114
• Accused Features: The complaint accuses ADT's system where the mobile app stores an initial geofence definition ("first checking data"), sends updates to ADT servers, and the servers in turn can modify the geofence, thereby sending "second checking data" back to the app Compl. ¶¶115-116

III. The Accused Instrumentality

Product Identification

• The accused instrumentalities are ADT's mobile applications, including the ADT+ app, SoSecure app, ADT Control app, MyADT app, and Pulse app, as well as ADT's Smart Home and Video security systems that interoperate with these apps Compl. ¶43

Functionality and Market Context

• The accused products provide smart home security and automation services that use a feature called "geofencing" Compl. ¶52 This technology uses the location of a user's smartphone, determined via GPS, Wi-Fi, or cellular signals, to create a virtual perimeter around a location like a home (Compl. ¶¶28; Compl. ¶53; Compl. ¶54). The complaint provides a screenshot from an ADT help article showing a map interface for creating and editing a circular geofence around a property Compl. p. 30
• When the user's device enters or leaves this geofence, the ADT app sends an update to ADT's servers, which can then trigger pre-programmed "automation rules and reminders" Compl. ¶¶54-55 Examples include sending arming reminders, automatically locking doors, adjusting lights, and pausing video recording Compl. ¶55 Compl. ¶87 The complaint alleges ADT is a "leading provider of security, interactive, and smart home solutions" in the United States Compl. ¶4

IV. Analysis of Infringement Allegations

U.S. Patent No. 8,738,040 Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
(a) repeatedly transmitting from at least one radio communication defining device a radio distinctive defining signal... that at least partially defines one of the special areas	The ADT system uses signals (e.g., GPS, Wi-Fi) to define a geofence, which constitutes the "special area" Compl. ¶53	¶53	col. 2:26-30
(b) observing the channel and processing any received signal by the mobile station in order to determine whether or not it is receiving a defining signal	The user's mobile device, running an ADT app, processes location data (e.g., GPS signals) to determine its position relative to the geofence Compl. ¶53	¶53	col. 2:31-34
(c) processing any received defining signal by the mobile station... and determines whether or not the mobile station is present in one or more of the special areas	The ADT app on the mobile station processes the geofence definition and the device's current location to determine if the user is inside or outside the defined area Compl. ¶54	¶54	col. 2:35-39
(d) sending an updating signal from the mobile station to a mobile telephone network about the mobile station presence... where the updating signal sending is uncorrelated to any mobile station phone call establishment	When the mobile station enters or exits the geofence, the ADT app sends an update signal with the new location status over a cellular or Wi-Fi network to ADT's servers Compl. ¶55	¶55	col. 2:40-43
(e) routing the updating signal from the mobile telephone network to special operating means that adapt the value of at least one operating parameter	ADT's servers act as the "special operating means," receiving the update and adapting parameters for automation rules like arming reminders or appliance control Compl. ¶55	¶55	col. 2:44-49
(f) associating the special areas with the mobile station by transmitting a checking data to the mobile station... this checking data being... used by the mobile station for determining whether or not the defining signal received is a distinctive defining signal	The initial setup of the geofence on the ADT app provides the "checking data" (e.g., the geofence coordinates and radius) that the app uses to identify its presence within that specific area Compl. ¶56	¶56	col. 2:49-57

U.S. Patent No. 10,009,720 Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
receiving and processing the distinctive defining signal in the mobile station, the distinctive defining signal at least defining a special area...	The user's mobile device running an ADT app receives and processes the geofence definition, which is established by its user-defined coverage area Compl. ¶69	¶69	col. 2:15-20
the distinctive defining signal including information indicating whether or not the radio communication defining device is in a predetermined environment	The geofence signal implicitly defines a "predetermined environment" such as the user's home, and the system determines if the device is within that environment Compl. ¶69	¶69	col. 7:48-67
sending from the mobile station via a mobile telephone network an updating signal to one or more servers of a provider of presence related services about the mobile station's presence in the special area	The ADT app sends location information (the "updating signal") to ADT's servers, which act as the "provider of presence related services," indicating whether the device is within the geofence Compl. ¶71	¶71	col. 2:21-24
the updating signal being useable by the one or more servers... to adjust an operating parameter, which comprises one or more of a tariff and a service flag, to adjust, activate, or deactivate the presence related services	ADT's servers use the location update to adjust a "service flag" (e.g., the Home/Away status), which activates or deactivates automation rules like arming reminders or video recording Compl. ¶72 A screenshot shows the Home/Away status parameter stored in ADT's system Compl. p. 47	¶72	col. 2:24-31
the updating signal comprising the information indicative of whether or not the radio communication defining device is located in the predetermined environment	The updating signal sent from the app to the server explicitly or implicitly contains the information about whether the user's device is inside or outside the "home" environment Compl. ¶71	¶71	col. 2:32-35

Identified Points of Contention

• Scope Questions: A central question may be whether the term "radio communication defining device," as described in embodiments that include specific base stations or dedicated Wi-Fi/Bluetooth hardware, can be construed to cover a modern smartphone's use of ambient GPS, Wi-Fi, and cellular signals for location awareness.
• Technical Questions: The infringement theory for the '040 and '720 patents relies on mapping the components of ADT's geofencing system to the claimed elements. A potential point of contention could be whether the ADT app and servers function as described in the patents. For instance, what evidence demonstrates that the geofence definition itself constitutes a "distinctive defining signal" that is "transmitted" and "received" in the manner claimed, as opposed to being locally stored data that the app's logic references?

V. Key Claim Terms for Construction

"mobile station"

• Context and Importance: This term's definition is critical for determining whether the patents apply to modern smartphones running an application. The complaint alleges that a smartphone running an ADT app is a "mobile station" Compl. ¶52 Practitioners may focus on whether the term is limited to the telecommunications devices of the 2006 priority-date era or is broad enough to encompass today's multi-function devices.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification states that a "mobile station" "is suitable to carry out a method according to the present invention" and "may be a mobile telephone or a Personal Digital Assistant for example" '040 Patent, col. 5:40-44 This non-exhaustive list could support an interpretation that includes modern smartphones.
  • Evidence for a Narrower Interpretation: The claims and specification consistently discuss the "mobile station" in the context of its interaction with a "mobile telephone network," base stations, and phone calls '040 Patent, claim 1 This context could be used to argue for a narrower definition tied to a device whose primary function is telecommunications on such a network.

"radio communication defining device"

• Context and Importance: The identity of this device is central to the infringement analysis. The complaint implicitly identifies it with the sources of signals (GPS, Wi-Fi, etc.) that define the geofence Compl. ¶53 The dispute will likely concern whether this term requires a specific, single piece of hardware transmitting a purpose-built signal, or if it can refer to the collection of ambient network signals a smartphone uses to determine its location.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The claim language is general, referring to "at least one radio communication defining device" that "transmits... a radio distinctive defining signal." This could arguably encompass any radio-based system that allows a location to be defined.
  • Evidence for a Narrower Interpretation: The specification provides specific examples, such as "a wireless device (212 or 212b), e.g. a WIFI, Bluetooth or DECT device" '040 Patent, col. 7:43-46 or a "base station" that transmits a special network identification code '040 Patent, col. 6:40-53 These embodiments could support an argument that the term is limited to discrete, identifiable transmitters rather than a diffuse set of location-triangulation signals.

VI. Other Allegations

Indirect Infringement

• The complaint alleges inducement of infringement based on Defendant's affirmative acts of providing instructions, marketing, product manuals, and online documentation that instruct and encourage customers to use the accused geofencing features (Compl. ¶¶57; Compl. ¶73). The complaint also points to ADT's "Smart Home Consultants" and "Service Technicians," who allegedly demonstrate and educate customers on using these infringing functionalities (Compl. ¶¶58; Compl. ¶74). A job posting for a "Smart Home Consultant" is provided as evidence that employees "educate customers on our app and features" Compl. p. 36

Willful Infringement

• The complaint alleges that Defendant had "actual notice of the Asserted Patents, at least as of the filing date of the Original Complaint" Compl. ¶44 This allegation appears to support a claim for post-suit willful infringement rather than pre-suit willfulness, as no facts suggesting knowledge prior to the lawsuit are pleaded.

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

• Definitional Scope and Technological Evolution: A primary issue will be whether the claims, rooted in a 2006 priority date and describing network components like "special mobile telephone network identification codes," can be construed to cover modern geofencing. The case may turn on whether a system using a smartphone's GPS and software-defined boundaries is equivalent to the patent's system of a "mobile station" identifying "distinctive defining signals" from specific "radio communication defining devices."
• Mapping System Architecture to Claim Language: The infringement read will depend on a successful mapping of ADT's cloud-and-app architecture onto the patent's claimed components. Key questions for the court will include: Is ADT a "provider of presence related services" separate from the "mobile telephone network" as required by certain claims? Do the geofence coordinates stored in the ADT app constitute the claimed "checking data," and does the "Home/Away" status update function as the claimed "updating signal"?
• Indirect Infringement and Intent: Assuming direct infringement by end-users is established, the focus will shift to ADT's liability. A key evidentiary question will be whether ADT's user manuals, help articles, and employee training materials demonstrate the specific intent required for inducement-that is, knowledge that the encouraged geofencing activity infringed the patents-in-suit. The complaint's reliance on job descriptions for service technicians who "educate customers on our app and features" suggests this will be a central part of Plaintiff's case Compl. p. 36