DCT

4:26-cv-01276

May Patents Ltd v. Lego As

Log In
Key Events
Complaint
complaint Intelligence

I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 4:26-cv-01276, E.D. Tex., 09/15/2026
  • Venue Allegations: Venue is alleged to be proper in the Eastern District of Texas because Defendant LEGO Brand Retail, Inc. has a regular and established place of business in the district, specifically a Lego store in Frisco, Texas.
  • Core Dispute: Plaintiff alleges that Defendant’s Smart Play™ product line, including the SMART Brick, SMART Charger, SMART Minifigures, and SMART Tags, infringes three patents related to interactive toys that respond to motion and other inputs.
  • Technical Context: The technology involves embedding sensors, processors, and wireless communication into toys to create interactive play experiences that respond to physical movement and proximity to other toy components.
  • Key Procedural History: Plaintiff alleges sending a notice letter to Defendants on February 8, 2026, identifying the Asserted Patents and their relevance to the Smart Play™ products, and that Defendants acknowledged receipt of the letter on February 27, 2026.

Case Timeline

Date Event
2011-03-25 Earliest Priority Date for Asserted Patents (U.S. Provisional 61/467,615)
2021-12-07 U.S. Patent No. 11,192,002 Issued
2024-09-17 U.S. Patent No. 12,095,277 Issued
2025-04-29 U.S. Patent No. 12,288,992 Issued
2026-02-08 Plaintiff's Counsel Allegedly Sent Notice Letter to Defendants
2026-02-27 LEGO Group Representative Allegedly Acknowledged Receipt of Letter
~2026-03-01 Accused Smart Play™ Products Offered for Sale in the U.S.
2026-09-08 Alleged Sale of an Accused Product at a Texas LEGO Store
2026-09-15 Complaint Filed

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

U.S. Patent No. 11,192,002 - “Device for Displaying in Response to a Sensed Motion”

  • Patent Identification: U.S. Patent No. 11,192,002, issued December 7, 2021.

The Invention Explained

  • Problem Addressed: The patent background describes a desire to advance the art of toys, such as balls, by providing a simple and cost-effective way to add amusement, education, and a better user experience without departing from the conventional "look and feel" of the toy (’002 Patent, col. 2:1-18).
  • The Patented Solution: The invention is a self-contained device, which can be housed in a toy like a ball, that uses a motion sensor (e.g., an accelerometer) to trigger a response from an "annunciator" (e.g., a light or speaker) ’002 Patent, abstract ’002 Patent, col. 2:22-35 The device is powered by a rechargeable battery that can be charged contactlessly via induction, similar to an electric toothbrush ’002 Patent, col. 2:54-58 The block diagram in Figure 8a illustrates the key components: a motion sensor, a processing/control unit, an annunciator, a rechargeable battery, and an induction-based charging system with a rectifier ’002 Patent, Fig. 8a
  • Technical Importance: This approach allows for the integration of interactive electronics into durable, sealed toy enclosures without the need for physical charging ports, enhancing robustness and safety.

Key Claims at a Glance

  • The complaint asserts at least independent claim 1 Compl. ¶38
  • The essential elements of independent claim 1 include:
    • an accelerometer for producing an output signal responsive to an acceleration;
    • a display for visually displaying information to a person;
    • a wireless receiver for receiving a wireless RF signal;
    • software and a processor coupled to the accelerometer, display, and wireless receiver;
    • a rechargeable battery;
    • a battery charger for induction-based contactless charging, comprising an induction coil; and
    • an enclosure housing the battery, processor, accelerometer, and display.
  • The claim also requires that the information displayed is in response to the output signal from the accelerometer.
  • The complaint does not explicitly reserve the right to assert other claims but states infringement of "one or more claims, including at least claim 1" Compl. ¶38

U.S. Patent No. 12,095,277 - “Device for Displaying in Response to a Sensed Motion”

  • Patent Identification: U.S. Patent No. 12,095,277, issued September 17, 2024.

The Invention Explained

  • Problem Addressed: The problem is identical to that described for the ’002 Patent: enhancing a conventional toy with interactive features in a simple, cost-effective manner (’277 Patent, col. 2:1-18).
  • The Patented Solution: This patent claims a device similar to the ’002 Patent but explicitly adds an "audible signaling component" as a required element alongside the visual display ’277 Patent, claim 1 The invention integrates motion sensing with both visual and audible feedback, wireless data reception, and contactless charging into a single, portable toy enclosure ’277 Patent, abstract The claim requires that the audible sound is emitted in response to the accelerometer's output signal.
  • Technical Importance: This patent specifically protects the combination of both visual and audible feedback that responds to motion, creating a more multi-sensory interactive experience.

Key Claims at a Glance

  • The complaint asserts at least independent claim 1 Compl. ¶48
  • The essential elements of independent claim 1 include:
    • an accelerometer;
    • a display for visually displaying information;
    • an audible signaling component for emitting an audible sound;
    • a wireless receiver for a wireless RF signal;
    • software and a processor;
    • a rechargeable battery;
    • a battery charger for induction-based charging; and
    • a portable enclosure housing the components.
  • The claim also requires that the audible sound is emitted in response to the output signal from the accelerometer.
  • The complaint alleges infringement of "one or more claims, including at least claim 1" Compl. ¶48

U.S. Patent No. 12,288,992 - “Device for Displaying in Response to a Sensed Motion”

  • Patent Identification: U.S. Patent No. 12,288,992, issued April 29, 2025.

Technology Synopsis

This patent claims a method for use in a portable device. The method involves producing signals from both an accelerometer and a second, different type of sensor (e.g., a light sensor). It requires emitting an audible sound and displaying information in response to the signals from both the accelerometer and the second sensor, as well as displaying data received wirelessly.

Asserted Claims

Independent claim 1 Compl. ¶58

Accused Features

The complaint alleges that the LEGO Smart Play Products, particularly the SMART Brick, perform the claimed method steps. This includes allegations that the SMART Brick uses its accelerometer (motion) and its sensor that recognizes SMART Tags and Minifigures (a second physical phenomenon) to control its lights and sounds, and that it displays data received wirelessly Compl. ¶¶56-57

III. The Accused Instrumentality

Product Identification

The LEGO® Smart Play™ system, which includes "All-In-One" and "Compatible" sets Compl. ¶20 The core accused components are the SMART Brick, SMART Charger, SMART Minifigure, and SMART Tag Compl. ¶22

Functionality and Market Context

  • The complaint describes the Smart Play™ system as an interactive toy platform designed to "come alive" while retaining the "traditional look and feel of conventional LEGO bricks" Compl. ¶21 The central component is the SMART Brick, a 2x4 LEGO brick containing sensors, a processor, lights, a speaker, a battery, and wireless communication technology Compl. ¶¶23-28
  • The SMART Brick is alleged to react to physical movement like twists and taps via a built-in accelerometer Compl. ¶23 It is also alleged to wirelessly recognize nearby "SMART Tags" and "SMART Minifigures," which tell the brick "what object to 'become' and how to behave" Compl. ¶24 Compl. ¶26 In response to these motion and proximity inputs, the brick allegedly produces "dynamic lights, sounds, behaviors and so much more" Compl. ¶¶23-25 A product screenshot shows the SMART Brick, Tag, and Minifigure interacting wirelessly to enable play scenarios Compl. p. 13
  • The system includes a SMART Charger that allegedly uses induction coils for contactless charging of the SMART Brick, analogous to an electric toothbrush Compl. ¶29

IV. Analysis of Infringement Allegations

’002 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
an accelerometer for producing an output signal responsive to an acceleration; The SMART Brick allegedly "comprises an accelerometer for producing an output signal responsive to an acceleration." It detects turns, twists, and taps. ¶23; ¶37 col. 7:59-63
a display for visually displaying information to a person; The SMART Brick allegedly comprises dynamic lights that react to play. The complaint includes an image showing the brick lighting up. ¶25; ¶22 col. 9:1-17
a wireless receiver for receiving a wireless RF signal carried over a wireless network; The SMART Brick allegedly comprises a wireless receiver for receiving signals from SMART Minifigures and SMART Tags. Communication is alleged to occur via Bluetooth and magnetic fields. ¶26; ¶28 col. 25:12-25
software and a processor for executing the software... The SMART Brick allegedly includes a processor ("bespoke, silicon ASIC chip") and software that controls the display and audible components in response to sensor signals. ¶27; ¶32 col. 4:1-5
a rechargeable battery for powering the device; The SMART Brick allegedly contains a rechargeable "internal power" source, a 45-milliamp-hour Li-ion battery. ¶28; ¶16 col. 2:54-58
a battery charger connected for induction-based contactless charging... wherein the battery charger comprises, or consists of, an induction coil... The system includes a SMART Charger that allegedly charges the SMART Brick via an induction coil, "like the one in your electric toothbrush." ¶29; ¶39 col. 24:1-14
an enclosure housing the rechargeable battery, the processor, the accelerometer, and the display, The SMART Brick is alleged to be a portable 2x4 LEGO brick enclosure that houses the internal components. An image shows the brick being placed on the charger. ¶28; ¶36 col. 2:23-25
wherein the information displayed is in response to the output signal. The lights on the SMART Brick allegedly react in response to the output from the accelerometer when the brick is moved, twisted, or turned. ¶25; ¶22 col. 4:33-36

Identified Points of Contention

  • Scope Question: A potential issue is whether the "dynamic lights" of the SMART Brick, which the complaint shows as simple illuminated studs, meet the claim limitation of "a display for visually displaying information to a person." The defense may argue this requires more than just illumination, while the patent's description of using an LED with different colors or intensities may support the plaintiff's broader interpretation ’002 Patent, col. 9:5-17
  • Technical Question: Claim 1 requires a "wireless receiver for receiving a wireless RF signal carried over a wireless network." The complaint alleges the system uses "Bluetooth and magnetic fields" Compl. ¶28 Compl. ¶30 While Bluetooth is an RF protocol, the complaint also heavily features communication via near-field magnetic induction coils between the Brick and Tags Compl. ¶25 Compl. ¶31 A key question for the court will be whether this near-field magnetic communication constitutes an "RF signal" as contemplated by the patent.

’277 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
an audible signaling component for emitting an audible sound; The SMART Brick is alleged to comprise an internal speaker and to produce "limitless number of sounds" and "synthetic soundscape[s]" in response to how it is moved and its proximity to other SMART components. ¶24; ¶25 col. 10:18-25
a portable enclosure housing the... audible signaling component... The SMART Brick enclosure allegedly houses the internal speaker. A teardown image in the complaint purports to show a "top loudspeaker" inside the brick. ¶28; ¶34 col. 44:9-13
wherein the audible sound is emitted in response to the output signal. The sounds emitted by the SMART Brick are alleged to react "uniquely depending on how it's moved, twisted and turned" based on input from its motion sensor. ¶24; ¶15 col. 44:17-18
[Other elements are substantially similar to the '002 Patent analysis above] [Allegations are substantially similar to the '002 Patent analysis above] ¶¶46-47 [Citations are substantially similar]

Identified Points of Contention

  • Functional Question: Claim 1 of the ’277 Patent requires the audible sound to be "emitted in response to the output signal" from the accelerometer. The complaint alleges the sounds depend on movement Compl. ¶24 but also on which SMART Tag or Minifigure is nearby Compl. ¶24 An image from a product page shows how a "SMART Tag" tells the brick "what object to behave and sound like" Compl. p. 12 The court may need to determine whether the sound is responsive to the accelerometer signal itself, or if the accelerometer signal merely acts as a generic trigger for a sound profile predetermined by a separate component (the Tag).

V. Key Claim Terms for Construction

For the ’002 and ’277 Patents

The Term: "display for visually displaying information"

  • Context and Importance: This term is central because the accused SMART Brick uses LEDs within its studs, rather than a traditional screen Compl. ¶25 The outcome of the case may depend on whether these responsive lights are construed as a "display for visually displaying information." Practitioners may focus on this term because the accused product's implementation is at the simpler end of what could be considered a display.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification suggests a broad meaning, stating the visual component may be "a visible light emitter based on a semiconductor device (e.g. LED-Light Emitting Diode)" and that a "single single-state visual indicator may be used to provide multiple indications, for example by using different colors... [or] different intensity levels" ’002 Patent, col. 3:1-4 ’002 Patent, col. 9:11-14 This supports the view that a simple, responsive LED can be a "display."
    • Evidence for a Narrower Interpretation: The specification also describes more complex displays, such as "a numerical or an alphanumerical display, capable of displaying numbers, letters, symbols, words or characters" ’002 Patent, col. 3:9-12 The defense could argue that the term "displaying information" requires this level of symbolic representation, which simple lights may not provide.

The Term: "wireless RF signal carried over a wireless network"

  • Context and Importance: This term is critical for determining if the communication between the SMART Brick and the passive SMART Tags falls within the claim scope. The complaint alleges the system uses "Bluetooth," "magnetic fields," and "coils" for communication Compl. ¶28 Compl. ¶30 Compl. ¶31 While Bluetooth is clearly RF, the primary interaction with the passive Tags appears to be based on near-field magnetic induction.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The patents do not explicitly define "RF signal" or "wireless network," leaving them open to their plain and ordinary meaning, which could arguably encompass any form of wireless electromagnetic communication, including near-field.
    • Evidence for a Narrower Interpretation: The claims of the ’002 Patent and ’277 Patent list the "wireless receiver for receiving a wireless RF signal" and the "battery charger... for induction-based... charging" as separate and distinct elements. This separation suggests that the inventors viewed "RF signal" as something different from the "electromagnetic field" used for inductive power transfer. A court may question whether the near-field communication between the Brick and Tag is functionally the same as the inductive charging field, and therefore not the "RF signal" required by the claim.

VI. Other Allegations

Indirect Infringement

The complaint alleges inducement of infringement by LEGO's U.S. customers, though it does not point to specific instructions or manuals that guide users to infringe Compl. ¶38 Compl. ¶48 Compl. ¶58 The allegations appear to be based on the inherent operation of the products when used as intended.

Willful Infringement

Willfulness is alleged for all three patents. The basis is alleged actual notice of the patents and the infringement, stemming from a letter sent on February 8, 2026, which was prior to the complaint's filing date of September 15, 2026 Compl. ¶40 Compl. ¶50 Compl. ¶60 The complaint alleges that LEGO Group continued to infringe despite this notice Compl. ¶41 Compl. ¶51 Compl. ¶61

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

  1. A central question will be one of definitional scope: does the term "display for visually displaying information," as used in the patents, cover the accused SMART Brick’s system of responsive, illuminated studs, or does it require a more complex, character-based screen as also described in the specification?

  2. A key technical question will be one of signal classification: does the communication between the SMART Brick and the passive SMART Tags, which the complaint suggests is based on near-field magnetic induction, constitute a "wireless RF signal carried over a wireless network" as required by the claims, or did the inventors intend for that term to mean a more conventional, far-field radio communication technology like Bluetooth, which is distinct from the inductive technology used for charging?

  3. A third key question will concern causation and claim scope: for the asserted method claims, does the accused SMART Brick emit sound and display information "in response to" both an accelerometer signal and a second sensor signal as a combined input, or does one signal (e.g., from the tag) merely select a sound profile that is then triggered by the other signal (e.g., from the accelerometer), potentially raising a question of whether the claim's "in response to" requirement is met?