Laserline Mfg Inc v. Burns

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Laserline MFG., Inc. (Oregon)
  • Defendant: KYLE BURNS d/b/a MARKEZ (Texas)
  • Plaintiff’s Counsel: Friedman, Suder & Cooke
• Case Identification: 3:26-cv-00406, N.D. Tex., 02/16/2026
• Venue Allegations: Venue is alleged to be proper in the Northern District of Texas because the Defendant resides in the district and operates an online business that makes, uses, and sells the accused products from a location within the district.
• Core Dispute: Plaintiff alleges that Defendant’s laser guidance kits for paint striping machines infringe three patents related to paint-striping laser guidance systems and technology.
• Technical Context: The technology involves using laser-based guidance systems to replace traditional, cumbersome string-line methods for painting straight lines on pavement, such as in parking lots.
• Key Procedural History: The complaint details extensive pre-suit correspondence, initiated by the Plaintiff on December 1, 2025, which included notification of the asserted patents and a demand to cease infringement. The Plaintiff also alleges it provided an illustrative claim chart for U.S. Patent No. 10,597,832. This history is cited as the basis for allegations of willful infringement.

Case Timeline

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

U.S. Patent No. 9,644,331 - PAINT-STRIPING LASER GUIDANCE SYSTEM AND RELATED TECHNOLOGY

• Patent Identification: U.S. Patent No. 9,644,331, “PAINT-STRIPING LASER GUIDANCE SYSTEM AND RELATED TECHNOLOGY,” issued May 9, 2017 Compl. ¶28

The Invention Explained

• Problem Addressed: The patent addresses the problems with conventional methods for painting lines on pavement, such as for parking lots, which typically rely on a physical string stretched between two points Compl. ¶21 This process is described as "time-consuming and cumbersome," and the string is noted to be susceptible to snagging on obstructions and bowing in windy conditions, leading to imprecise lines (’331 Patent, col. 1:24-49).
• The Patented Solution: The invention is a system comprising a paint-striping machine and a guidance system that uses a light-emitting device, such as a laser, to project a "planar light region" with a vertical orientation (’331 Patent, abstract). This projected light forms a visible line on the ground or a target, which an operator can follow to guide the machine along a straight path, thereby eliminating the need for a physical string and its associated drawbacks (’331 Patent, col. 3:40-52).
• Technical Importance: This technology aims to provide a more reliable and efficient guidance mechanism for paint striping that is not affected by wind or ground obstructions, resulting in straighter painted lines Compl. ¶22

Key Claims at a Glance

• The complaint asserts infringement of at least independent claim 1 Compl. ¶29
• The essential elements of Claim 1, a system claim, include:
  • A paint-striping machine with a carriage, a nozzle, an outrigger with an elongate rod, and a coupler.
  • A guidance system connected to the paint-striping machine.
  • The guidance system includes a light-emitting device (laser) in a housing, configured to form a planar light region with a vertical orientation.
  • The guidance system also includes a mounting and containment assembly providing an adjustable connection.
  • This assembly includes an "adjustment mechanism operable to move the light-emitting device... and thereby change a yaw angle of the planar light region."
  • The assembly also includes a clamp to releasably secure the system to the outrigger's rod.

U.S. Patent No. 10,202,726 - PAINT-STRIPING LASER GUIDANCE SYSTEM AND RELATED TECHNOLOGY

• Patent Identification: U.S. Patent No. 10,202,726, “PAINT-STRIPING LASER GUIDANCE SYSTEM AND RELATED TECHNOLOGY,” issued February 12, 2019 Compl. ¶33

The Invention Explained

• Problem Addressed: Similar to the ’331 Patent, this patent targets the inefficiencies and inaccuracies of using traditional string lines for guiding paint striping operations (Compl. ¶21; ’726 Patent, col. 1:25-52).
• The Patented Solution: The patent claims a method for operating a paint-striping system. The method involves positioning a paint striper at a starting point, moving it toward an end point while dispensing paint, and simultaneously emitting a planar light region from a guidance system to form a visible guide line (’726 Patent, col. 10:18-42). The core of the patented method is guiding the machine's movement by "maintaining an alignment of the guidance line with a stationary reference" (’726 Patent, col. 10:39-41).
• Technical Importance: By creating a method of guidance based on a projected light and a stationary reference, the invention seeks to standardize a more accurate and reliable process for painting straight lines over long distances compared to physically marked or string-guided paths Compl. ¶22

Key Claims at a Glance

• The complaint asserts infringement of at least independent claim 1 Compl. ¶34
• The essential elements of Claim 1, a method claim, include the steps of:
  • Positioning a paint-striping machine at a first location on a path.
  • Moving the machine toward a second location while dispensing paint.
  • Emitting a planar light region with a vertical orientation from a guidance system to form a visible guidance line.
  • Guiding the machine's movement toward the second location by maintaining alignment of the guidance line with a "stationary reference."

U.S. Patent No. 10,597,832 - PAINT-STRIPING LASER GUIDANCE SYSTEM AND RELATED TECHNOLOGY

• Patent Identification: U.S. Patent No. 10,597,832, “PAINT-STRIPING LASER GUIDANCE SYSTEM AND RELATED TECHNOLOGY,” issued March 24, 2020 Compl. ¶38

Technology Synopsis

• This patent is part of the same family as the ’331 and ’726 patents and addresses the same technical problem of inaccurate and cumbersome string-line methods for paint striping Compl. ¶21 The ’832 patent claims a paint-striping guidance system that includes an outrigger, a light-emitting device to form a planar light region, and a mounting assembly with an adjustment mechanism to change the yaw angle of the light region (’832 Patent, abstract).

Asserted Claims & Accused Features

• Asserted Claims: At least independent claim 1 is asserted Compl. ¶39
• Accused Features: The complaint alleges that Defendant’s "Green Line Laser Kit," comprising a laser and mounting hardware, infringes the ’832 Patent when used as intended for parking lot striping (Compl. ¶¶25, 39). The complaint notes that an illustrative claim chart for claim 1 of this specific patent was provided to the Defendant pre-suit Compl. ¶15

III. The Accused Instrumentality

Product Identification

• The accused product is the "Green Line Laser Kit" Compl. ¶25

Functionality and Market Context

• The complaint describes the accused product as a kit sold for parking lot striping, which includes a green line laser, a mounting bracket, a 12-volt battery, and other related components Compl. ¶25 The kit is intended to be attached to a paint striping machine to provide laser guidance.
• Plaintiff alleges that Defendant markets the Green Line Laser Kit on its website as a "direct alternative" to products sold by LaserLine's licensed distributor, suggesting the products compete in the same market for the same function Compl. ¶25

IV. Analysis of Infringement Allegations

No probative visual evidence provided in complaint.

The complaint does not provide claim charts or a detailed, element-by-element infringement analysis for any of the asserted patents. Instead, it makes narrative allegations that the "Green Line Laser Kit" contains the components and functionality that infringe the asserted claims (Compl. ¶¶29, 34, 39).

For the system claims of the ’331 and ’832 Patents, the infringement theory appears to be that the Defendant’s kit directly infringes by making and selling the claimed guidance system, or contributorily infringes by providing the essential components for customers to assemble the full infringing system with a paint striper (Compl. ¶¶29, 39).

For the method claim of the ’726 Patent, the infringement theory is based on inducement. The complaint alleges that Defendant provides "step-by-step instructions for setup and use" that direct its customers to operate the kit in a manner that performs all steps of the claimed method Compl. ¶¶35-36

Identified Points of Contention

• Scope Questions: A central question for the system claims may be whether the "Green Line Laser Kit" as sold meets all limitations of the claimed "guidance system," or whether infringement only occurs once a customer combines the kit with a third-party paint-striping machine. A further question is whether the mounting bracket included in the kit qualifies as the claimed "adjustment mechanism operable to... change a yaw angle."
• Technical Questions: For the method claim, a key factual question will be what, precisely, the defendant's instructions direct users to do. The analysis will focus on whether those instructions teach the specific step of "guiding further movement... while maintaining an alignment of the guidance line with a stationary reference," as required by the claim.

V. Key Claim Terms for Construction

For the ’331 Patent

• The Term: "adjustment mechanism operable to... change a yaw angle" (’331 Patent, col. 10:11-14)
• Context and Importance: This term is central to defining the required functionality of the mounting assembly. The infringement analysis will depend on whether the defendant's mounting bracket allows for the specific side-to-side pivoting adjustment implied by "yaw angle," as opposed to other types of adjustments (e.g., pitch or roll).
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The claim language itself is functional ("operable to... change a yaw angle"), which may support a construction that covers any structure capable of performing that function, regardless of its specific form.
  • Evidence for a Narrower Interpretation: The specification discloses a specific embodiment where the mechanism is a "slider 166 that can be shifted left or right to pivot the bracket" (’331 Patent, col. 6:40-44). A party could argue this embodiment limits the scope of the term to a sliding-type mechanism.

For the ’726 Patent

• The Term: "stationary reference" (’726 Patent, col. 10:41)
• Context and Importance: This term defines the object or point with which the laser's guidance line must be aligned. Its construction is critical because it dictates how the guidance step of the claimed method is performed. A broad definition could cover nearly any fixed point, while a narrow one might require a specific type of pre-placed target.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The plain meaning of the term suggests any non-moving object or point could qualify. The specification discusses using the system to follow a path between two marked locations, which could serve as references (’726 Patent, col. 6:21-25).
  • Evidence for a Narrower Interpretation: The specification prominently features a "portable target 105" with a "visually distinctive alignment mark 177" (’726 Patent, col. 6:8-20). A party may argue that these detailed descriptions suggest the "stationary reference" is intended to be a purpose-built target, not just an arbitrary mark on the pavement.

VI. Other Allegations

• Indirect Infringement: The complaint alleges active inducement of infringement for all three patents. The basis for this allegation is that Defendant provides "step-by-step instructions" and markets its products for an infringing use, thereby encouraging and intending for its customers to directly infringe Compl. ¶¶30-31 Compl. ¶¶35-36 Compl. ¶¶40-41
• Willful Infringement: The complaint alleges that Defendant’s infringement has been willful since at least December 7, 2025, the date Defendant allegedly acknowledged receipt of Plaintiff’s first notice letter identifying the patents-in-suit Compl. ¶19 The complaint details a history of pre-suit communications, including the provision of a claim chart for the ’832 Patent, as evidence of Defendant's knowledge and deliberate disregard of Plaintiff’s patent rights Compl. ¶¶12-18

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

This case will likely center on the following key questions for the court:

• A core issue will be one of infringement and system boundaries: Does the accused "Green Line Laser Kit," as sold by the Defendant, contain all the elements of the asserted system claims, particularly the functionally-defined "adjustment mechanism operable to... change a yaw angle"? Or does direct infringement only occur upon assembly by a customer, raising questions of contributory or induced infringement?
• A second key issue will be one of inducement and instruction: For the asserted method claims, what evidence exists that the Defendant’s instructions and marketing materials specifically direct customers to perform every claimed step, including the crucial step of "maintaining an alignment of the guidance line with a stationary reference"?
• Finally, a central question will be one of willfulness: Given the alleged pre-suit notice, which included a claim chart for one of the patents, did the Defendant’s continued commercial activity constitute the kind of objectively reckless conduct required to support a finding of willful infringement and potential enhancement of damages?