DCT

5:26-cv-04418

Prosperina Ventures LLC v. MaxLite Inc

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 5:26-cv-04418, C.D. Cal., 08/05/2026
  • Venue Allegations: Venue is alleged to be proper as Defendant has committed acts of patent infringement in the district and maintains a regular and established place of business in Ontario, California.
  • Core Dispute: Plaintiff alleges that Defendant's various LED lighting products infringe six patents related to technologies for emergency power conversion, LED lamp structural design, light diffusion, and thermal management.
  • Technical Context: The technology at issue addresses critical aspects of LED lamp design, including retrofitting for emergency power, thermal management via heat sinks, and optical design for uniform light distribution, which are key factors in the performance and market adoption of LED lighting.
  • Key Procedural History: The complaint does not allege any prior litigation, Inter Partes Review (IPR) proceedings, or licensing history related to the patents-in-suit.

Case Timeline

Date Event
2009-06-08 U.S. Patent No. 10,107,487 Priority Date
2009-11-09 U.S. Patent No. 9,310,030 Priority Date
2009-12-17 U.S. Patent No. 9,137,866 Priority Date
2010-09-24 U.S. Patent No. 9,470,882 Priority Date
2012-03-20 U.S. Patent No. 9,651,239 Priority Date
2013-06-28 U.S. Patent No. 9,222,659 Priority Date
2015-09-15 U.S. Patent No. 9,137,866 Issued
2015-12-29 U.S. Patent No. 9,222,659 Issued
2016-04-12 U.S. Patent No. 9,310,030 Issued
2016-10-18 U.S. Patent No. 9,470,882 Issued
2017-05-16 U.S. Patent No. 9,651,239 Issued
2018-10-23 U.S. Patent No. 10,107,487 Issued
2026-08-05 Complaint Filing Date

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

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

  • Issued: September 15, 2015

The Invention Explained

  • Problem Addressed: The patent's background describes the difficulty and cost of retrofitting buildings with LED lighting, as existing emergency backup power systems are often designed for fluorescent lamps and are incompatible with LEDs. '866 Patent, col. 1:21-48
  • The Patented Solution: The invention proposes a "passive resonant converter circuit" that acts as an interface between a conventional fluorescent emergency lighting module and a modern LED light string. During a power failure, this circuit receives the high-frequency AC output from the fluorescent emergency module and converts it to a DC current suitable for powering the LEDs, enabling the reuse of existing emergency hardware. '866 Patent, abstract '866 Patent, col. 2:1-24 '866 Patent, FIG. 1
  • Technical Importance: This technology was designed to lower the barrier to entry for upgrading commercial lighting to more energy-efficient LEDs by allowing building owners to retain their existing, and often costly, emergency backup infrastructure. '866 Patent, col. 5:5-10

Key Claims at a Glance

  • The complaint asserts at least independent claim 1 Compl. ¶32
  • Essential elements of Claim 1 include:
    • a passive resonant converter circuit configured to be coupled to an emergency lighting module and to an input end of a group of solid state emitters, at which the group of solid state emitters receives a normal operation current from an LED driver,
    • wherein the passive resonant converter circuit is configured to receive an emergency operation current from the emergency lighting module and to provide a converted emergency operation current to the group of solid state emitters at an emergency input of the group of solid state emitters in response to the emergency operation current.
  • The complaint reserves the right to assert additional claims Compl. ¶32

U.S. Patent No. 9,222,659 - "LED lamp"

  • Issued: December 29, 2015

The Invention Explained

  • Problem Addressed: The patent addresses the challenge of replacing traditional fluorescent tube lights with LED lamps, noting that such replacements can be difficult to install and may not replicate the 360-degree light distribution pattern of a fluorescent tube, which can affect the performance of the light fixture. '659 Patent, col. 1:11-23 '659 Patent, col. 8:55-59
  • The Patented Solution: The patent discloses an LED lamp, particularly for replacing fluorescent tubes, that features rotatable end pins. This allows the main body of the lamp to be oriented after it is secured in the fixture's "tombstone" connectors. The design also includes a specially shaped lens that extends behind the plane of the LEDs, creating a backlight effect that mimics the omnidirectional illumination of a fluorescent tube by using the fixture's own reflective surfaces. '659 Patent, abstract '659 Patent, col. 8:35-54 '659 Patent, FIG. 3
  • Technical Importance: This design facilitates a simpler installation process for LED tube retrofits and better replicates the lighting characteristics of the fluorescent tubes they replace, improving both ease-of-use and aesthetic and functional performance. '659 Patent, col. 5:21-30

Key Claims at a Glance

  • The complaint asserts at least independent claim 1 Compl. ¶37
  • Essential elements of Claim 1 include:
    • an enclosure at least partially optically transmissive;
    • at least one LED in the enclosure operable to emit light through the enclosure when energized through an electrical path;
    • a first pair of pins mounted in a control member, the control member being freely rotatable relative to the enclosure and being in the electrical path.
  • The complaint reserves the right to assert additional claims Compl. ¶37

U.S. Patent No. 9,310,030 - "Non-uniform diffuser to scatter light into uniform emission pattern"

  • Issued: April 12, 2016 Compl. ¶19
  • Technology Synopsis: The patent addresses the problem of non-uniform color and intensity in light emitted from LED lamps. The invention discloses a lighting device with a specifically shaped, non-uniform diffuser that is spaced apart from the light source and a wavelength conversion material (e.g., a remote phosphor), which reshapes the light distribution to create a more uniform, omnidirectional emission pattern. '030 Patent, abstract '030 Patent, col. 1:21-2:1
  • Asserted Claims: The complaint asserts at least claim 1 Compl. ¶42
  • Accused Features: The Maxlite Par20 Bulb, Maxlite MR16 Gu5.3 Floodlight, Maxlite Par38 Bulb, and Maxlite Par30 Flood Lamp are accused of infringement Compl. ¶42

U.S. Patent No. 9,470,882 - "Optical arrangement for a solid-state lamp"

  • Issued: October 18, 2016 Compl. ¶22
  • Technology Synopsis: The patent addresses light loss and inefficiency in lamps using Total Internal Reflection (TIR) optics. The invention is an optical arrangement where a highly reflective secondary reflector is placed near, but not in contact with, the primary TIR optic to recapture and redirect stray light that escapes the primary optic, thereby increasing the lamp's overall efficiency. '882 Patent, abstract '882 Patent, col. 1:21-2:2
  • Asserted Claims: The complaint asserts at least claim 1 Compl. ¶47
  • Accused Features: The Maxlite Par30 Flood Lamp, Maxlite MR16 Gu5.3 Floodlight, Maxlite Par20 Bulb, and Maxlite Par38 Bulb are accused of infringement Compl. ¶47

U.S. Patent No. 9,651,239 - "LED lamp and heat sink"

  • Issued: May 16, 2017 Compl. ¶25
  • Technology Synopsis: This patent addresses the need for improved thermal management in LED lamps. It discloses a heat sink with a novel structure, comprising a portion inside the lamp enclosure thermally coupled to the LEDs and an external portion featuring "overhangs" that extend over the lamp's enclosure and base, which increases the heat-dissipating surface area with minimal impact on the lamp's overall size. '239 Patent, abstract '239 Patent, col. 1:21-2:19
  • Asserted Claims: The complaint asserts at least claim 1 Compl. ¶52
  • Accused Features: The Maxlite MR16 Gu5.3 Floodlight, Maxlite 60W 3000K Puck Lamp, and Maxlite Par30 Flood Lamp are accused of infringement Compl. ¶¶52-53

U.S. Patent No. 10,107,487 - "LED light bulbs"

  • Issued: October 23, 2018 Compl. ¶28
  • Technology Synopsis: The patent addresses the need for structurally rigid and thermally efficient LED light engines that can be manufactured cost-effectively. The invention describes an LED light engine made from a planar substrate that is bent or folded into a three-dimensional, rigid support structure, allowing for precise placement of LEDs on multiple surfaces while simplifying the manufacturing process. '487 Patent, abstract '487 Patent, col. 10:1-12
  • Asserted Claims: The complaint asserts at least claim 1 Compl. ¶57
  • Accused Features: The Maxlite 60W 3000K Puck Lamp, Maxlite G25 Lamp, Maxlite MR16 Gu5.3 Floodlight, Maxlite Par20 Bulb, Maxlite Par38 Bulb, and Maxlite Par30 Flood Lamp are accused of infringement Compl. ¶¶57-58

III. The Accused Instrumentality

Product Identification

  • The complaint accuses a range of Defendant's LED lighting products, including the Maxlite GuardMax Oval Security Wall Pack, Maxlite MR16 Gu5.3 Floodlight, Maxlite 60W 3000K Puck Lamp, Maxlite Par20 Bulb, Maxlite Par30 Flood Lamp, and Maxlite PL G24Q 6W Bulb Compl. ¶2

Functionality and Market Context

  • The complaint alleges these products are commercial LED lighting devices marketed and sold throughout the United States Compl. ¶2 The accused products span several categories, including outdoor security lighting (Wall Pack), directional spotlights (MR16, Par20, Par30), and general-purpose lamps (Puck Lamp, PL Bulb), suggesting they incorporate a variety of technologies for power, thermal management, and optical control Compl. ¶¶2, 32, 37, 42, 47, 52, 57
  • The complaint does not provide specific technical details on the operation of the accused products beyond identifying them by name and accusing them of infringing the patents-in-suit.
  • No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint alleges infringement of at least claim 1 of each asserted patent and states that exemplary claim charts are provided in Exhibits 7 through 12 Compl. ¶33 Compl. ¶38 Compl. ¶43 Compl. ¶48 Compl. ¶53 Compl. ¶58 As these exhibits were not included with the complaint, the following analysis summarizes the infringement theory in prose based on the allegations in the complaint body.

U.S. Patent No. 9,137,866 Infringement Allegations

The complaint alleges that the "Maxlite GuardMax Oval Security Wall Pack" and similar products infringe at least claim 1 of the '866 Patent Compl. ¶32 The infringement theory appears to be that the accused product contains circuitry that functions as the claimed "passive resonant converter circuit." This circuit allegedly allows the LED-based wall pack to be powered by an emergency lighting module designed for fluorescent lights by receiving the module's native output and converting it to a current suitable for the product's solid-state emitters during a power failure (Compl. ¶32; Compl. ¶33, Compl. ¶claim 1).

U.S. Patent No. 9,222,659 Infringement Allegations

The complaint alleges that the "Maxlite PL G24Q 6W Bulb" and similar products infringe at least claim 1 of the '659 Patent Compl. ¶37 The infringement theory appears to be that the accused bulb possesses the structural features of the claimed lamp. This includes an enclosure, at least one LED, and, critically, a "first pair of pins mounted in a control member, the control member being freely rotatable relative to the enclosure," which allows the lamp's orientation to be adjusted after installation in a fixture (Compl. ¶37; Compl. ¶38, Compl. ¶claim 1).

  • Identified Points of Contention:
    • Technical Questions: For the '866 patent, a central question will be whether the circuitry in the accused wall pack in fact operates as a "passive resonant converter." This will likely involve an analysis of whether the circuit lacks active voltage or current regulation and utilizes resonance to convert the emergency power, as contemplated by the patent '866 Patent, col. 2:1-5 '866 Patent, col. 6:30-34
    • Scope Questions: For the '659 patent, a key dispute may arise over the term "freely rotatable." The analysis will question whether the accused bulb's end pins can be rotated relative to the lamp's main housing and to what extent. The interpretation of "freely"-whether it implies unrestricted movement or simply adjustability (e.g., 90 degrees as mentioned in the specification)-will be critical to the infringement analysis '659 Patent, col. 12:15-24

V. Key Claim Terms for Construction

'866 Patent

  • The Term: "passive resonant converter circuit"
  • Context and Importance: This term defines the core of the invention in claim 1. Its construction will be dispositive, as infringement hinges on whether the accused product's circuitry falls within the scope of this definition. Practitioners may focus on this term because the distinction between a "passive" and "active" circuit is a fundamental technical boundary in power electronics.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The claim itself is functional, defining the circuit by what it does (receives one current, provides a converted one) rather than by a specific list of components. The specification also refers to the circuit in general terms, such as an "impedance matching" circuit, which could support a broader, function-oriented definition ('866 Patent, col. 6:58-62).
    • Evidence for a Narrower Interpretation: The patent's detailed description and figures provide specific examples, such as a "CL filter circuit" with a particular capacitor and inductor arrangement ('866 Patent, col. 7:3-11; '866 Patent, FIG. 1). A defendant might argue that these embodiments limit the term to the specific circuit topologies disclosed or their direct equivalents.

'659 Patent

  • The Term: "freely rotatable"
  • Context and Importance: This term is critical for claim 1 as it describes the key mechanical feature enabling the lamp's orientation to be adjusted post-installation. The dispute will likely center on the degree and nature of the rotation required to meet this limitation.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The plain meaning of "freely" suggests a lack of significant impediment to rotation. The purpose of the rotation is functional-to orient the lamp-which could support an interpretation that any mechanism allowing for such adjustment meets the claim '659 Patent, col. 12:15-24
    • Evidence for a Narrower Interpretation: The specification explicitly describes rotating the member "90 degrees" to engage the electrical contacts in a tombstone fixture '659 Patent, col. 12:20 Further, dependent claim 24 adds the limitation "at least 90 degrees." A party could argue this suggests the independent claim's term "freely rotatable" does not inherently require a 90-degree range, but a defendant might conversely argue the specification's primary example sets the context for what "rotatable" means in this invention.

VI. Other Allegations

  • Indirect Infringement: The complaint includes a general allegation of indirect infringement Compl. ¶9, but it does not plead specific facts to support the knowledge and intent elements required for a claim of induced infringement, nor does it identify any non-staple components for a claim of contributory infringement.
  • Willful Infringement: The complaint does not contain an explicit count for willful infringement or allege that the defendant had pre- or post-suit knowledge of the patents.

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

  • A core issue will be one of technical and functional equivalence: For the multiple patents asserted, the case will depend on whether the specific circuits, heat sinks, and optical components within Defendant's various LED products perform substantially the same function in substantially the same way to achieve the same result as described in the asserted claims. Given the lack of technical detail in the complaint, this will be a central battleground for discovery and expert testimony.
  • A second key issue will be one of claim scope and construction: The dispute will likely turn on the interpretation of several key terms. For the '866 patent, can the accused product's emergency power circuit be defined as a "passive resonant converter circuit"? For the '659 patent, does the accused bulb's connector meet the definition of being "freely rotatable"? The court's construction of these and other terms will likely determine the outcome of the infringement analysis for several of the asserted patents.
  • A final question will be one of evidentiary proof: With six distinct patents asserted against a wide array of products, a significant challenge for the Plaintiff will be to marshal sufficient evidence to prove, on a limitation-by-limitation basis, that each accused product infringes the specific claims asserted against it. The skeletal nature of the complaint suggests that the case's substance will be almost entirely developed during discovery.
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