DCT

3:26-cv-01006

Prosperina Ventures LLC v. Service Lighting Electrical Supplies Inc

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 3:26-cv-01006, N.D. Tex., 03/30/2026
  • Venue Allegations: Venue is alleged to be proper as Defendant's principal place of business is within the Northern District of Texas, and the Defendant has allegedly committed acts of patent infringement in the district.
  • Core Dispute: Plaintiff alleges that Defendant's commercial LED lighting products infringe ten U.S. patents related to various aspects of LED lamp technology, including heat dissipation structures, emergency lighting conversion circuits, and optical arrangements.
  • Technical Context: The technology at issue pertains to the design and operation of LED light bulbs, a market segment focused on providing energy-efficient replacements for traditional incandescent and fluorescent lighting.
  • Key Procedural History: The complaint does not mention any prior litigation, Inter Partes Review (IPR) proceedings, or licensing history related to the patents-in-suit.

Case Timeline

Date Event
2009-10-20 U.S. Patent No. 9,030,120 Priority Date
2010-03-03 U.S. Patent No. 9,310,030 Priority Date
2010-06-08 U.S. Patent No. 10,107,487 Priority Date
2011-04-25 U.S. Patent No. 9,470,882 Priority Date
2011-12-12 U.S. Patent No. 9,137,866 Priority Date
2012-12-12 U.S. Patent No. 9,534,767 Priority Date
2013-03-14 U.S. Patent No. 9,651,239 Priority Date
2013-06-28 U.S. Patent No. 9,169,977 Priority Date
2013-06-28 U.S. Patent No. 9,222,659 Priority Date
2014-04-16 U.S. Patent No. 9,435,528 Priority Date
2015-05-12 U.S. Patent No. 9,030,120 Issued
2015-09-15 U.S. Patent No. 9,137,866 Issued
2015-10-27 U.S. Patent No. 9,169,977 Issued
2015-12-29 U.S. Patent No. 9,222,659 Issued
2016-04-12 U.S. Patent No. 9,310,030 Issued
2016-09-06 U.S. Patent No. 9,435,528 Issued
2016-10-18 U.S. Patent No. 9,470,882 Issued
2017-01-03 U.S. Patent No. 9,534,767 Issued
2017-05-16 U.S. Patent No. 9,651,239 Issued
2018-10-23 U.S. Patent No. 10,107,487 Issued
2026-03-30 Complaint Filing Date

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

U.S. Patent No. 9,030,120 - "Heat sinks and lamp incorporating same"

  • Patent Identification: U.S. Patent No. 9,030,120, issued May 12, 2015 Compl. ¶14

The Invention Explained

  • Problem Addressed: The patent's background section notes that while LED lamps are energy-efficient, their implementation has been hindered by limitations including heat dissipation. Conventional heat sinks sufficient to cool high-output LEDs are often too large for standard lamp form factors or can block light output, creating undesirable shadows '120 Patent, col. 5:1-11 '120 Patent, col. 6:4-10
  • The Patented Solution: The invention discloses an LED lamp with a heat dissipation element that defines an internal "heat dissipation chamber." This chamber has at least one inlet and one outlet, designed to allow an ambient medium, such as air, to flow through it, thereby cooling the lamp via natural convection '120 Patent, abstract '120 Patent, col. 7:49-57 This "chimney effect" design aims to provide effective passive cooling within the compact envelope of a traditional light bulb '120 Patent, Fig. 4
  • Technical Importance: This approach to thermal management enables the design of higher-power, passively cooled LED replacement bulbs that can fit into standard sockets without requiring active cooling mechanisms like fans, which would add cost, noise, and potential points of failure '120 Patent, col. 20:20-24

Key Claims at a Glance

  • The complaint asserts at least Claim 2, which depends on independent Claim 1 Compl. ¶45
  • The essential elements of independent Claim 1 include:
    • A lamp with at least a first solid state light emitter.
    • A first heat dissipation element comprising a sidewall defining a "heat dissipation chamber."
    • The emitter is thermally coupled to the heat dissipation element.
    • The chamber has at least a first "inlet opening" and a first "outlet opening," allowing an ambient medium to pass through.
  • Dependent Claim 2 adds limitations specifying a separate power supply housing and requires that the lamp is configured such that an ambient medium can enter the power supply housing without passing through the heat dissipation chamber.

U.S. Patent No. 9,137,866 - "Emergency lighting conversion for LED strings"

  • Patent Identification: U.S. Patent No. 9,137,866, issued September 15, 2015 Compl. ¶17

The Invention Explained

  • Problem Addressed: As commercial buildings upgrade from fluorescent to LED lighting, a significant cost is the replacement of existing emergency lighting modules, which are typically designed to power fluorescent tubes during a power outage. Using these existing modules to power new LED fixtures presents a technical challenge '866 Patent, col. 1:40-64
  • The Patented Solution: The patent describes a "passive resonant converter circuit" that functions as an interface between a fluorescent emergency lighting module and an LED string '866 Patent, abstract When a power failure occurs, this circuit receives the emergency current from the existing fluorescent module and converts it into a form suitable for powering the LEDs, enabling the LED fixture to function as an emergency light without replacing the building's underlying emergency backup system '866 Patent, col. 6:5-14 '866 Patent, Fig. 1
  • Technical Importance: The invention facilitates a more cost-effective transition from fluorescent to LED lighting in environments with existing emergency backup systems by allowing the re-use of the installed fluorescent emergency modules '866 Patent, col. 1:60-64

Key Claims at a Glance

  • The complaint asserts at least independent Claim 1 Compl. ¶49
  • The essential elements of independent Claim 1 include:
    • An emergency lighting apparatus comprising a "passive resonant converter circuit."
    • The circuit is configured to couple to both an emergency lighting module and a group of solid-state emitters (LEDs).
    • The circuit is configured to receive an "emergency operation current" from the module and provide a "converted emergency operation current" to the LEDs.

Additional Patents-in-Suit

  • U.S. Patent No. 9,169,977: "LED lamp," issued October 27, 2015 Compl. ¶20

    • Technology Synopsis: The patent describes an LED lamp with an enclosure and an optically transmissive lens. A key feature is that a portion of the lens extends behind the plane of the LEDs, allowing a percentage of the total light output (e.g., 5-25%) to be emitted as backlight, mimicking the light distribution of traditional fluorescent tubes '977 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶53
    • Accused Features: The complaint accuses the "PLT-80057" product line of infringement Compl. ¶53

  • U.S. Patent No. 9,222,659: "LED lamp," issued December 29, 2015 Compl. ¶23

    • Technology Synopsis: The patent discloses an LED lamp designed as a replacement for linear fluorescent tubes. A central feature is the inclusion of rotatable end caps with electrical pins, allowing the lamp body to be oriented after it is installed in a fixture's tombstone connectors '659 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶57
    • Accused Features: The complaint accuses the "PLT-50151" product line of infringement Compl. ¶57

  • U.S. Patent No. 9,310,030: "Non-uniform diffuser to scatter light into uniform emission pattern," issued April 12, 2016 Compl. ¶26

    • Technology Synopsis: The technology involves a lighting device with a light source and a separate diffuser. The diffuser is designed with non-uniform characteristics, such as varying thickness or scattering properties across its surface, to transform a directional light source into a more uniform, omnidirectional emission pattern suitable for A19 bulb replacements '030 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶61
    • Accused Features: The complaint accuses multiple product lines, including "PLT-11938" and "PLT-11141," of infringement Compl. ¶61

  • U.S. Patent No. 9,435,528: "LED lamp with LED assembly retention member," issued September 6, 2016 Compl. ¶29

    • Technology Synopsis: This patent describes a mechanical feature for an LED lamp where the LED assembly is mounted on a central heat-conducting tower under radial tension. A "retention member" is added to restrain the assembly from moving along the tower's axis, which could otherwise occur due to thermal expansion and contraction during operation '528 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶65
    • Accused Features: The complaint accuses the "PLT-13636" product line of infringement Compl. ¶65

  • U.S. Patent No. 9,470,882: "Optical arrangement for a solid-state lamp," issued October 18, 2016 Compl. ¶32

    • Technology Synopsis: The invention discloses an optical system for an LED lamp comprising a primary optical element (such as a Total Internal Reflection, or TIR, lens) and a highly reflective secondary reflector positioned adjacent to, but not in contact with, the primary element. This arrangement is designed to capture and redirect stray light that escapes the primary optic, thereby improving the lamp's overall efficiency '882 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶69
    • Accused Features: The complaint accuses multiple product lines, including "PLT-11141" and "PLT-11938," of infringement Compl. ¶69

  • U.S. Patent No. 9,534,767: "LED lamp," issued January 3, 2017 Compl. ¶35

    • Technology Synopsis: This patent relates to an LED lamp designed to replace fluorescent tubes in a troffer housing. The invention includes a base that secures to the troffer's wire way, a power supply situated within that wire way, and an electrical connector for linking to the building's power source, facilitating a retrofit installation '767 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶73
    • Accused Features: The complaint accuses the "PLT-80066" product line of infringement Compl. ¶73

  • U.S. Patent No. 9,651,239: "LED lamp and heat sink," issued May 16, 2017 Compl. ¶38

    • Technology Synopsis: The patent describes a heat sink for an LED lamp that includes a portion inside the lamp enclosure and a second part exposed to the ambient environment. This exposed part features fins that form "overhangs," extending over portions of the lamp's enclosure and base to increase the available surface area for heat dissipation '239 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶77
    • Accused Features: The complaint accuses product lines including "PLT-LC-LEDMR163527KE" of infringement Compl. ¶77

  • U.S. Patent No. 10,107,487: "LED light bulbs," issued October 23, 2018 Compl. ¶41

    • Technology Synopsis: The invention relates to an LED light engine fabricated from a substantially planar substrate (like a circuit board) that is subsequently shaped or bent. This process forms a rigid, three-dimensional support structure that allows LEDs to be mounted on multiple non-coplanar surfaces, enabling a more omnidirectional light output from a single, formed component '487 Patent, abstract
    • Asserted Claims: At least Claim 1 Compl. ¶81
    • Accused Features: The complaint accuses multiple product lines, including "PLT-11938" and "PLT-12204," of infringement Compl. ¶81

III. The Accused Instrumentality

Product Identification

  • The complaint identifies the accused instrumentalities as a list of commercial LED lighting products, designated by model numbers including, inter alia, PLTS-12294, PLT-12578, PLT-80057, and PLT-50151 Compl. ¶2

Functionality and Market Context

  • The complaint does not describe the specific technical functionality, design, or operation of the accused products. It alleges that these are commercial products marketed, offered for sale, and distributed throughout the United States by the Defendant Compl. ¶2

IV. Analysis of Infringement Allegations

The complaint alleges infringement of each of the ten patents-in-suit but does not provide claim charts or a narrative infringement theory within the body of the document. For each count, the complaint references an external exhibit (e.g., Exhibits 11-20) as containing an "exemplary claim chart" Compl. ¶46 Compl. ¶50 Compl. ¶54 Compl. ¶58 Compl. ¶62 Compl. ¶66 Compl. ¶70 Compl. ¶74 Compl. ¶78 Compl. ¶82 These exhibits were not provided for analysis. As such, a detailed element-by-element analysis of the infringement allegations is not possible based on the provided complaint.

Identified Points of Contention

  • Regarding the '120 Patent: A potential point of contention may be structural. The analysis may focus on whether the accused PLTS-12294 product contains a "heat dissipation chamber" with distinct "inlet" and "outlet" openings that facilitate the flow of an "ambient medium" for convective cooling, as required by Claim 1. For dependent Claim 2, a key factual question may concern the specific path of airflow, and whether the complaint can provide evidence that an ambient medium enters the power supply housing without first passing through the heat dissipation chamber.
  • Regarding the '866 Patent: The infringement analysis may turn on the technical definition of the term "passive resonant converter circuit." Key questions could be whether the circuitry within the accused PLT-12578 product operates without active voltage or current regulation and whether it utilizes a resonant circuit to transform the emergency current from a fluorescent module into a "converted" current suitable for the LEDs, as required by Claim 1.

No probative visual evidence provided in complaint.

V. Key Claim Terms for Construction

For the '120 Patent

  • The Term: "heat dissipation chamber"
  • Context and Importance: This term is central to the structural uniqueness of the claimed invention. Its construction will determine whether the claim reads on conventional heat sink designs or is limited to the specific "chimney-like" structure depicted in the patent's figures. Practitioners may focus on this term because its scope dictates whether a simple arrangement of fins creating channels for airflow meets the limitation.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification refers generally to "channels, recesses, or cavities" that may permit the flow of a cooling fluid, suggesting the term is not limited to a single, fully enclosed structure '120 Patent, col. 12:38-42
    • Evidence for a Narrower Interpretation: The abstract describes a "chamber, whereby an ambient medium can enter the chamber, pass through the chamber, and exit," which suggests a more defined and bounded volume. The embodiments shown in figures like Fig. 4 depict a distinct internal space within the heat sink body, which may support a narrower construction limited to such specific arrangements '120 Patent, abstract '120 Patent, Fig. 4

For the '866 Patent

  • The Term: "passive resonant converter circuit"
  • Context and Importance: This term defines the core of the invention. The qualifiers "passive" and "resonant" are technically significant, and their construction will be critical in determining whether the accused product's circuitry infringes. The dispute will likely center on whether the accused circuit operates in the specific manner described by these terms.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The patent states the circuit is configured to support power transfer "without active voltage or current regulation" '866 Patent, col. 2:15-18 This could be argued to encompass any circuit that lacks a feedback-controlled regulator integrated circuit, regardless of its specific topology.
    • Evidence for a Narrower Interpretation: The detailed description and figures illustrate specific embodiments that use an inductor and capacitor to form a resonant circuit (e.g., an LC or CL circuit) '866 Patent, col. 7:1-5 '866 Patent, Fig. 1 This may support a narrower construction requiring the presence of an actual LC resonant tank, as opposed to any circuit that may incidentally exhibit some resonant properties.

VI. Other Allegations

  • Indirect Infringement: The complaint includes boilerplate allegations of direct "and/or indirectly" infringing for several counts Compl. ¶69 Compl. ¶73 Compl. ¶77 Compl. ¶81 However, the complaint pleads no specific facts to support the elements of knowledge and intent required for induced infringement, nor does it identify any non-staple components for a claim of contributory infringement.
  • Willful Infringement: The complaint alleges that the Defendant had knowledge of the asserted patents "at least as early as the filing and service of this Complaint" Compl. ¶86 It further alleges that Defendant's ongoing infringement after receiving this notice constitutes "willful and deliberate infringement" Compl. ¶88 No allegations of pre-suit knowledge are made.

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

  1. Sufficiency of Pleadings: A threshold procedural question will concern whether the complaint's barebones allegations, which rely entirely on external, un-provided exhibits to articulate the infringement theory for ten different patents, satisfy the plausibility standard required to state a claim for patent infringement under federal pleading standards.

  2. Structural and Functional Equivalence: For the asserted apparatus claims, a central technical dispute will be one of structural and functional correspondence. For instance, with the '120 Patent, can the "heat dissipation chamber" be construed to cover the accused product's cooling structures? For the '866 Patent, does the accused product's emergency power circuit operate as a "passive resonant converter," or does it employ a fundamentally different, non-infringing technology?

  3. Claim Scope and Definition: The case will likely involve significant disputes over claim construction. The viability of the infringement claims will depend on whether key terms, such as "heat dissipation chamber" ('120 Patent) and "passive resonant converter circuit" ('866 Patent), are given broad or narrow interpretations by the court.

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