DCT

7:26-cv-00065

Aleddra Inc v. RAB Lighting Inc

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 7:26-cv-00065, N.D. Tex., 08/20/2026
  • Venue Allegations: Venue is alleged to be proper as Defendant RAB Lighting, Inc. maintains a regular and established place of business within the Northern District of Texas and has committed acts of infringement there.
  • Core Dispute: Plaintiff alleges that Defendant's light-emitting diode (LED) tube lamps with integrated emergency battery backup capabilities infringe five U.S. patents related to power management, safety, and testing for such devices.
  • Technical Context: The technology concerns LED lighting designed to replace conventional fluorescent tubes, which incorporate a rechargeable battery and control circuitry to provide emergency illumination during a power outage.
  • Key Procedural History: The complaint details a multi-year history of pre-suit correspondence, beginning with a notice letter on February 5, 2023, regarding U.S. Patent Nos. 10,225,905 and 10,237,946. Plaintiff alleges it subsequently provided claim charts for these and a third patent, U.S. Patent No. 10,645,782. Plaintiff alleges Defendant had knowledge of the remaining two patents-in-suit, U.S. Patent Nos. 11,172,551 and 11,846,396, at least as of the filing of the original complaint, and alternatively alleges willful blindness based on the patents sharing a common prosecution history.

Case Timeline

Date Event
2012-06-15 Earliest Priority Date ('905, '946, '782, '551, '396 Patents)
2019-03-05 U.S. Patent No. 10,225,905 Issues
2019-03-19 U.S. Patent No. 10,237,946 Issues
2020-05-05 U.S. Patent No. 10,645,782 Issues
2021-11-09 U.S. Patent No. 11,172,551 Issues
2023-02-05 Plaintiff sends first notice letter to Defendant regarding '905 and '946 patents
2023-03-17 Plaintiff begins virtual marking for '905, '946, and '782 patents
2023-04-07 Plaintiff provides claim charts for '905 and '946 patents to Defendant
2023-05-06 Defendant allegedly indicates it will not take a license
2023-12-19 U.S. Patent No. 11,846,396 Issues
2024-07-13 Plaintiff sends second notice letter to Defendant regarding '782 patent
2024-08-30 Plaintiff provides claim chart for '782 patent to Defendant
2024-11-20 Defendant allegedly again indicates it will not take a license
2026-06-05 Original Complaint Filed
2026-08-20 First Amended Complaint Filed

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

U.S. Patent No. 10,225,905

  • Patent Identification: U.S. Patent No. 10,225,905, "Solid-State Lighting with Noncoupled Drivers Free of Electric Shock Hazard," issued March 5, 2019.

The Invention Explained

  • Problem Addressed: The patent's background describes the challenges in retrofitting fluorescent lights with LEDs. It notes that while AC mains-operable LEDs are more efficient than ballast-compatible types, both approaches can present safety concerns, such as the risk of electric shock, particularly in complex fixtures. '905 Patent, col. 2:1-9
  • The Patented Solution: The invention is an LED luminaire with an integrated emergency lighting system that uses "noncoupled drivers" to enhance safety. '905 Patent, abstract It employs separate drivers for normal operation (using AC mains power) and emergency operation (using a rechargeable battery). Crucially, the charging circuit and the AC-powered driver are designed with electrically isolated ground references to prevent current from finding unintended paths, thereby reducing the risk of electric shock. '905 Patent, abstract '905 Patent, col. 8:19-31 A logic control circuit automatically selects the appropriate driver based on the availability of AC power. '905 Patent, cl. 1
  • Technical Importance: This design aims to provide a "plug-and-play" LED replacement for fluorescent tubes that is not only energy-efficient but also incorporates emergency functionality with enhanced safety features to address hazards in retrofit installations. '905 Patent, col. 2:57-64

Key Claims at a Glance

  • The complaint asserts independent claim 1. Compl. ¶38
  • The essential elements of independent claim 1 include:
    • An LED luminaire with at least four electrical conductors for AC mains.
    • One or more LED arrays and a rechargeable battery.
    • First and second full-wave rectifiers and input filters.
    • A "charging circuit" with a "first transformer" and an "electrically isolated" second ground reference, which charges the battery.
    • A "first driver" to power the LEDs from the battery when AC mains are unavailable.
    • A "second driver" with a "second transformer" to power the LEDs from AC mains when available.
    • A "logic control circuit" to automatically select between the first and second drivers based on AC power availability.
  • The complaint does not explicitly reserve the right to assert dependent claims for this patent.

U.S. Patent No. 10,237,946

  • Patent Identification: U.S. Patent No. 10,237,946, "Solid-State Lighting with Stand-Alone Test Capability Free of Electric Shock Hazard," issued March 19, 2019.

The Invention Explained

  • Problem Addressed: The patent addresses the regulatory requirement for periodic testing of emergency lighting systems (e.g., for 30 seconds monthly and 90 minutes annually). It notes the motivation to create an LED lamp with an integrated test function that can be easily operated on-site. '946 Patent, col. 3:13-28
  • The Patented Solution: The invention adds a "stand-alone test capability" to an emergency LED luminaire. This is achieved through a "test and voltage pull-down circuit" that includes a built-in test switch. '946 Patent, abstract When the test is initiated, this circuit manipulates a dimming voltage signal to disable the normal AC-powered driver and enable the battery-powered driver, simulating a power outage and allowing for a test of the emergency function. The design is intended to meet regulatory test requirements without operational ambiguity. '946 Patent, abstract '946 Patent, col. 4:11-22
  • Technical Importance: This technology simplifies compliance with mandatory safety testing by integrating the test functionality directly into the lamp itself, eliminating the need for external equipment or complex procedures to initiate a test. '946 Patent, col. 12:25-40

Key Claims at a Glance

  • The complaint asserts independent claim 1. Compl. ¶46
  • The essential elements of independent claim 1 include:
    • An LED luminaire with components similar to the '905 patent (conductors, LED arrays, battery, rectifiers, filters, charging circuit, first driver, second driver).
    • A "test and voltage pull-down circuit" that itself comprises a "first voltage pull-down circuit" and a "second voltage pull-down circuit".
    • This circuit is configured to either "pull down a dimming voltage" to disable the first (battery) driver when AC power is on, or "pull up the dimming voltage" to enable the first driver when AC power is off.
    • The circuit is further configured to ensure that when a test is performed, the first (battery) driver is enabled while the second (AC) driver is inactivated.
  • The complaint does not explicitly reserve the right to assert dependent claims for this patent.

U.S. Patent No. 10,645,782

  • Patent Identification: U.S. Patent No. 10,645,782, "Solid-State Lighting with Emergency Power Management," issued May 5, 2020.
  • Technology Synopsis: The '782 patent discloses an LED luminaire with a detailed "luminaire control circuit" designed to manage its dual-mode operation. This control circuit includes a "first switch circuit" for managing battery discharging, a "second switch circuit" for managing battery charging, and a "switchover circuit" to ensure that only one LED driving current (either from the battery or AC mains) powers the LED array at a time, thereby preventing crosstalk. '782 Patent, abstract '782 Patent, col. 4:25-63
  • Asserted Claims: The complaint asserts independent claim 1. Compl. ¶54
  • Accused Features: The complaint alleges that the Accused Products' internal circuitry for managing battery power and switching between normal and emergency modes infringes the claimed control circuit architecture. Compl. ¶54 Compl. ¶55

U.S. Patent No. 11,172,551

  • Patent Identification: U.S. Patent No. 11,172,551, "Solid-State Lighting with a Driver Controllable by a Power-Line Dimmer," issued November 9, 2021.
  • Technology Synopsis: The '551 patent focuses on ensuring compatibility between an LED driver and an external power-line dimmer. It describes an "electric current bypass circuit" that provides a "holding current" necessary for the dimmer (e.g., a TRIAC dimmer) to sustain its function, preventing the lamp from flickering or failing to operate at low power levels. '551 Patent, abstract The driver circuit is also designed to regulate its output regardless of the input voltage level from the dimmer. '551 Patent, cl. 11
  • Asserted Claims: The complaint asserts independent claim 13. Compl. ¶62
  • Accused Features: At least one of the Accused Products, the T8-15-48G-8CCGT-HYB, is accused of infringing by incorporating circuitry that enables compatibility with power-line dimmers, allegedly practicing the claimed invention. Compl. ¶62

U.S. Patent No. 11,846,396

  • Patent Identification: U.S. Patent No. 11,846,396, "Linear Solid-State Lighting with Bidirectional Circuits," issued December 19, 2023.
  • Technology Synopsis: The '396 patent details a linear LED lamp with emergency functionality centered on two key components: a "bidirectional circuit" and a "self-diagnostic circuit." The bidirectional circuit is configured to manage the two-way flow of electrical current for charging and discharging the battery. The self-diagnostic circuit provides for automated evaluation of the battery's performance and displays the results via a status indicator. '396 Patent, abstract
  • Asserted Claims: The complaint asserts independent claim 1. Compl. ¶70
  • Accused Features: The Accused Products are alleged to infringe by utilizing bidirectional circuitry for battery management and by incorporating self-diagnostic features to test and report on the status of the emergency power system. Compl. ¶70 Compl. ¶71

III. The Accused Instrumentality

  • Product Identification: The complaint identifies several exemplary Accused Products, including the T10EM-17-48P-835-SE-BYP, T10EM-17-48P-840-SE-BYP, T10EM-17-48P-850-SE-BYP, RAB Emergency LED Tube BT01 (SBR10), and T8-15-48G-8CCGT-HYB. Compl. ¶5
  • Functionality and Market Context: The Accused Products are described as LED tube lamps that incorporate battery backup functionality, allowing them to provide illumination during a power outage. Compl. ¶1 Compl. ¶33 The complaint presents an image of the Accused Product T10EM-17-48P-850-SE-BYP, which appears as a standard linear tube lamp. Compl. ¶34 A second image shows the RAB Emergency LED Tube BT01 (SBR10), which includes a visible switch assembly on the tube body. Compl. ¶35 The complaint alleges that Plaintiff Aleddra and Defendant RAB are direct competitors in the U.S. market for LED tube lamps. Compl. ¶6

IV. Analysis of Infringement Allegations

The complaint references exemplary claim charts attached as exhibits but does not provide them. Compl. ¶39 Compl. ¶47 The analysis is therefore based on the narrative infringement allegations.

  • U.S. Patent No. 10,225,905 Infringement Allegations:
    The complaint alleges that the Accused Products directly infringe at least claim 1 of the '905 patent by making, using, selling, or importing them in the United States. Compl. ¶38 The infringement theory suggests that the circuitry within the Accused Products embodies the claimed invention of an emergency LED luminaire with "noncoupled drivers." This includes the allegedly separate drivers for AC and battery power and the use of multiple, electrically isolated ground references to achieve the patent's claimed safety benefit of being "Free of Electric Shock Hazard." Compl. ¶17 Compl. ¶38 '905 Patent, title

  • U.S. Patent No. 10,237,946 Infringement Allegations:
    The complaint alleges infringement of at least claim 1 of the '946 patent. Compl. ¶46 The narrative theory is that the Accused Products contain the claimed "test and voltage pull-down circuit," which provides a "stand-alone test capability." This feature, allegedly present in the Accused Products, is said to work by simulating a power failure to test the emergency battery mode, which corresponds to the patent's description of pulling a dimming voltage up or down to enable or disable the respective drivers. Compl. ¶46 '946 Patent, cl. 1 The image of the RAB Emergency LED Tube BT01 (SBR10), which features a visible switch, may be intended to support the allegation that the product has a built-in test function. Compl. ¶35

  • Identified Points of Contention:

    • Scope Questions: A primary issue for the '905 patent will be one of structural scope: does the term "noncoupled drivers", as defined by the patent's requirement for multiple, electrically isolated ground references, read on the actual circuit architecture of the Accused Products? For the '946 patent, a key question will be whether the accused devices' test function, if any, operates as a "test and voltage pull-down circuit" that specifically manipulates a "dimming voltage" as claimed, or if it uses a different, non-infringing mechanism.
    • Technical Questions: The case may turn on evidence from circuit analysis and product teardowns. A key factual question will be what grounding scheme the Accused Products employ and whether it provides the electrical isolation described in the '905 patent. Another evidentiary question will be how the test switch on products like the RAB Emergency LED Tube BT01 (SBR10) actually functions at the circuit level and whether its operation aligns with the specific "voltage pull-down" mechanism required by claim 1 of the '946 patent.

V. Key Claim Terms for Construction

  • Term 1: "noncoupled drivers" '905 Patent, cl. 1

    • Context and Importance: This term is central to the '905 patent's stated purpose of providing an LED lamp "Free of Electric Shock Hazard." The infringement determination will likely depend on whether the Accused Products' circuits meet the structural requirements for being "noncoupled." Practitioners may focus on this term because it appears to be a patentee-coined phrase intended to capture a specific safety architecture.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: A party might argue the term should be understood functionally, covering any design with separate drivers for AC and battery power that are sufficiently isolated to prevent shock, without being limited to the exact schematic shown.
      • Evidence for a Narrower Interpretation: Claim 1 itself, along with the specification, provides a highly specific structural definition. It requires a "charging circuit" with a "second ground reference electrically isolated from the first ground reference" and a "second driver" with its own transformer and grounding scheme. '905 Patent, cl. 1 '905 Patent, fig. 1 This language may support an interpretation that the term requires the specific multi-ground, transformer-isolated topology described in the patent.

  • Term 2: "test and voltage pull-down circuit" '946 Patent, cl. 1

    • Context and Importance: This term defines the mechanism for the '946 patent's "stand-alone test capability." Infringement of claim 1 hinges on whether the Accused Products contain a circuit that performs this specific function in the manner claimed.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: A defendant might argue that the term should be construed broadly to mean any circuit that initiates an internal test, attempting to encompass a wider range of prior art.
      • Evidence for a Narrower Interpretation: Claim 1 is structurally detailed, requiring the circuit to "pull down a dimming voltage" to disable one driver and "pull up the dimming voltage" to enable the other. '946 Patent, cl. 1 The specification further describes how this circuit interacts with the dimming controllable device. '946 Patent, col. 4:11-22 This suggests the term is not a generic "test circuit" but one that operates through a specific voltage manipulation mechanism tied to a dimming signal path.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges induced infringement for all five patents. The basis for this allegation is Defendant's distribution of materials such as "manuals, installation instructions, data sheets," and other documents that allegedly instruct customers and end-users on how to use the Accused Products in an infringing manner. Compl. ¶40 Compl. ¶48 Compl. ¶56 Compl. ¶64 Compl. ¶72
  • Willful Infringement: Willfulness is alleged for all asserted patents. For the '905, '946, and '782 patents, the claim is based on alleged pre-suit knowledge stemming from notice letters and the provision of claim charts beginning in February 2023. Compl. ¶30 For the '551 and '396 patents, the complaint alleges knowledge as of the filing of the original complaint and, in the alternative, willful blindness. The willful blindness theory is based on the argument that Defendant knew of infringement of earlier patents in the same family and took "deliberate actions to avoid learning" about these subsequent, related patents. Compl. ¶31

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

  • A core issue will be one of structural equivalence: do the power conversion and safety circuits within the Accused Products embody the specific "noncoupled" architecture, defined by multiple electrically isolated ground references, as required by the '905 patent, or do they achieve a similar function through a technically distinct and non-infringing design?
  • A key evidentiary question will be one of functional operation: does the testing feature in the Accused Products, particularly the one associated with the visible switch on the BT01 model, operate by "pulling down a dimming voltage" to simulate a power failure as specifically claimed in the '946 patent, or does it rely on a different circuit mechanism to initiate the test?
  • A central question for damages will be the extent of willfulness, especially concerning the '551 and '396 patents. The court will likely need to determine whether Defendant's undisputed knowledge of the earlier patents in the family, combined with Plaintiff's public patent marking, created an affirmative duty to investigate later-issued family members, potentially exposing Defendant to findings of willful blindness and enhanced damages.
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