Baker Laser Technology LLC v. Delta Electronics Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Baker Laser Technology, LLC (Massachusetts)
  • Defendant: Delta Electronics, Inc. (Taiwan)
  • Plaintiff's Counsel: Kent & Risley LLC
• Case Identification: 2:25-cv-00890, E.D. Tex., 03/12/2026
• Venue Allegations: Plaintiff alleges venue is proper because the Defendant is a foreign corporation.
• Core Dispute: Plaintiff alleges that Defendant's laser projectors infringe a patent related to laser projection systems that use two or more semiconductor lasers and a rotating disk to form an image.
• Technical Context: The technology at issue involves compact laser projection systems, a field significant for creating high-brightness, high-resolution displays for commercial and consumer use.
• Key Procedural History: The complaint notes that during prosecution of the patent-in-suit, the applicant amended the claims from "one or more semiconductor lasers" to "two or more semiconductor lasers" to overcome prior art, an agreement noted in an Examiner Interview Summary. This amendment may be relevant to claim scope and the doctrine of equivalents.

Case Timeline

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

• Patent Identification: U.S. Patent No. 9,185,373, "Laser Projection System," issued November 10, 2015.

U.S. Patent No. 9,185,373 - "Laser Projection System"

The Invention Explained

• Problem Addressed: The patent describes conventional projectors as being heavy, bulky, and inconvenient, creating a need for a "lighter and more portable solution" '373 Patent, col. 2:1-4 Existing technologies, such as those using high-powered bulbs and LCDs, were difficult to miniaturize '373 Patent, col. 1:56-67
• The Patented Solution: The invention proposes a compact projection system that uses two or more semiconductor lasers to generate pulses of light '373 Patent, abstract These light pulses are combined and then transmitted through a "rotating disk" containing a multitude of lenses '373 Patent, col. 2:20-25 '373 Patent, Fig. 5 The system synchronizes the firing of the lasers with the disk's rotation, causing each lens on the disk to direct the light pulses to a specific location on a surface to form a visible image '373 Patent, col. 2:30-35
• Technical Importance: The complaint alleges that the use of two or more semiconductor lasers provided benefits like redundancy, scalable brightness, and more efficient design, while the use of a rotating disk allowed for simultaneous production of high-resolution and high-brightness images Compl. ¶20 Compl. ¶21

Key Claims at a Glance

• The complaint asserts independent claims 8-11 and 13 Compl. ¶22 Claim 8, a method claim, is representative.
• Independent Claim 8 Elements:
  • generating a beam of light using two or more semiconductor lasers,
  • said beam of light consisting of a stream of pulses of light to display on the surface,
  • transmitting said pulses of light through a rotating disk; and
  • synchronizing said rotating disk with the lasers such that the pulses of light are modified such that an image is formed on the surface.
• The complaint reserves the right to assert all claims, including dependent claims Compl. ¶24 Compl. ¶25 Compl. ¶26

III. The Accused Instrumentality

Product Identification

• The complaint identifies a range of Defendant's laser projectors, including the Vivitek DU9900Z and various DU, DH, and DK series models Compl. ¶22

Functionality and Market Context

• The complaint alleges these are laser projectors that infringe by incorporating the inventions claimed in the '373 Patent Compl. ¶23 The complaint asserts that these products operate by using two or more semiconductor lasers to send pulses of light through a rotating disk (often a phosphor wheel) to form an image on a surface Compl. ¶13 Compl. ¶14 Compl. ¶15 The complaint does not provide specific details on the commercial importance of the accused products beyond their identification.

IV. Analysis of Infringement Allegations

The complaint references preliminary claim charts in Exhibits K-M, which were not attached to the filed complaint provided for this analysis Compl. ¶22 The following chart is constructed based on the narrative allegations in the complaint body.

No probative visual evidence provided in complaint.

'373 Patent Infringement Allegations

Identified Points of Contention:

• Scope Questions: A central question may be whether the accused products' "phosphor wheel" Compl. ¶21 meets the definition of the claimed "rotating disk" which the patent specification primarily describes as a "rotating disk of lenses" '373 Patent, col. 2:21-22 The court may need to determine if a phosphor wheel, which converts laser light to different colors, performs the same function in the same way as the patent's described disk of lenses, which primarily directs light.
• Technical Questions: The complaint makes general allegations of "synchronizing" Compl. ¶14 Compl. ¶15 A key factual question will be whether the accused projectors perform the specific synchronization recited in the claim, where the interaction between the laser pulses and the rotating disk modifies the light to form an image as claimed. The complaint does not provide specific evidence on how Defendant's synchronization mechanism operates.

V. Key Claim Terms for Construction

• The Term: "rotating disk"
• Context and Importance: This term appears in all asserted independent claims and is central to the invention's architecture Compl. ¶13 Compl. ¶14 Compl. ¶15 The infringement analysis will likely depend on whether this term is construed broadly to cover various rotating components in a light path (like a phosphor wheel) or narrowly to mean a disk containing lenses for directing light.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The claim language itself does not specify that the disk must contain lenses, only that pulses of light are sent "through" it '373 Patent, col. 8:25 This could support an argument that the term encompasses any rotating disk in the light path that modifies the light.
  • Evidence for a Narrower Interpretation: The patent's abstract and summary of the invention consistently describe the disk as containing "lenses" '373 Patent, abstract '373 Patent, col. 2:21-22 The detailed description of the preferred embodiment specifies a "disk 502 that has 1200 different lenses 504" '373 Patent, col. 6:28-29 This language may be used to argue that the invention is limited to a disk with lenses, not other structures like phosphor wheels.

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement, stating that after receiving a notice letter on March 10, 2025, Defendant continued to market, advertise, and distribute the accused products, thereby encouraging infringement by third parties like distributors and customers Compl. ¶24 Compl. ¶25 The complaint also alleges contributory infringement, asserting the accused products have no substantial non-infringing use Compl. ¶26
• Willful Infringement: Willfulness is alleged based on Defendant's continued infringement after having actual knowledge of the '373 Patent from the March 10, 2025 notice letter Compl. ¶28

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

• A core issue will be one of definitional scope: can the term "rotating disk," described in the patent specification as containing a multitude of lenses to direct light, be construed to cover the accused projectors' rotating phosphor wheels, which function to convert the color of laser light?
• A key evidentiary question will be one of technical mechanism: what evidence will be presented to demonstrate that the accused projectors perform the claimed step of "synchronizing said rotating disk with the lasers such that the pulses of light are modified such that an image is formed on the surface" in the specific manner required by the claim?
• A third question relates to patentability: while the complaint argues the invention was a technological improvement Compl. ¶16 Compl. ¶19, the defense may challenge the validity of the claims by arguing that combining multiple lasers with a rotating wheel in a projector was obvious at the time of the invention, despite the prosecution history cited by the plaintiff.