DCT

1:26-cv-00683

Caterpillar Paving Products Inc v. Bluelight Machines Inc

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 1:26-cv-00683, D. Del., 06/10/2026
  • Venue Allegations: Venue is alleged to be proper in the District of Delaware because the Defendant, Bluelight Machines Inc., is a Delaware corporation and therefore resides in the district.
  • Core Dispute: Plaintiff alleges that Defendant's aftermarket kits, which convert heavy construction equipment into autonomous machines, infringe five U.S. patents related to autonomous worksite planning and machine control.
  • Technical Context: The technology at issue involves systems and methods for automating construction vehicles, such as soil compactors, by generating digital site plans and controlling machine operations to improve efficiency and consistency.
  • Key Procedural History: The complaint alleges that Plaintiff sent Defendant a letter on May 14, 2026, demanding that Defendant cease its infringement of the patents-in-suit, which may be relevant to the allegations of willful infringement.

Case Timeline

Date Event
2017-12-14 Priority Date for '943, '644, '472 Patents
2018-09-27 Priority Date for '831 Patent
2020-03-06 Priority Date for '338 Patent
2020-05-05 U.S. Patent No. 10,640,943 Issued
2021-07-06 U.S. Patent No. 11,054,831 Issued
2021-09-07 U.S. Patent No. 11,111,644 Issued
2022-12-20 U.S. Patent No. 11,531,338 Issued
2023-03-20 Bluelight Machines Inc. Incorporated
2023-04-18 U.S. Patent No. 11,629,472 Issued
2026-05-14 Caterpillar sends demand letter to Bluelight
2026-06-10 Complaint Filed

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

U.S. Patent No. 10,640,943 ("the '943 Patent"), "SYSTEM AND METHOD FOR COMPACTING A WORKSITE SURFACE," issued May 5, 2020.

The Invention Explained

  • Problem Addressed: The patent's background section describes that traditional methods for compacting worksite surfaces rely heavily on operator judgment, which can lead to human error, inconsistent quality, and inefficient over-compaction of certain areas '943 Patent, col. 1:31-49
  • The Patented Solution: The invention is a control system that automates the compaction process. It receives "first information" defining a worksite perimeter and "second information" defining compaction requirements (e.g., number of passes) '943 Patent, col. 2:10-14 Based on this data, it generates a "compaction plan" that includes a travel path for the machine, displays this path for operator approval, and, upon receiving approval, automatically controls the machine's operation to execute the plan '943 Patent, abstract '943 Patent, FIG. 3
  • Technical Importance: This technology sought to replace subjective operator-led compaction with a data-driven, automated process to enhance consistency, efficiency, and the structural integrity of large-scale projects like roads and parking lots '943 Patent, col. 1:45-53

Key Claims at a Glance

  • The complaint asserts infringement of at least independent claim 1 Compl. ¶22
  • Claim 1 of the '943 Patent includes the following essential elements:
    • receiving first information indicative of a location of a perimeter of a worksite surface;
    • receiving second information indicative of compaction requirements specific to the worksite surface;
    • generating a compaction plan based at least partly on the first and second information, which includes determining a travel path for a compaction machine that is substantially within the worksite perimeter;
    • causing at least part of the determined travel path to be displayed via a control interface of the compaction machine;
    • receiving an input indicative of approval of the determined travel path; and
    • controlling operation of the compaction machine on the worksite surface in accordance with the plan, based at least partly on receiving the input.
  • The complaint reserves the right to assert infringement of other claims '943 Patent, claim 1 Compl. ¶21

U.S. Patent No. 11,054,831 ("the '831 Patent"), "AUTOMATIC SITE PLANNING FOR AUTONOMOUS CONSTRUCTION VEHICLES," issued July 6, 2021.

The Invention Explained

  • Problem Addressed: Conventional methods for planning the paths of autonomous construction vehicles are described as potentially inefficient, not fully automatic, and susceptible to user error '831 Patent, col. 1:21-26
  • The Patented Solution: The patent describes a method for automatically generating a complete site plan. The system defines a worksite boundary, identifies the longest edge of that boundary, and defines a path orientation parallel to that longest edge '831 Patent, col. 2:32-37 It then defines a maneuver area, a start point, and a full travel path, automatically creating a site plan that is then used to control the vehicle '831 Patent, abstract '831 Patent, col. 2:41-47
  • Technical Importance: The invention provides a higher degree of automation by not just executing a plan but by automatically generating the key components of the plan itself, such as the path orientation, which is optimized for efficiency by aligning with the worksite's longest dimension '831 Patent, col. 10:18-22

Key Claims at a Glance

  • The complaint asserts infringement of at least independent claim 1 Compl. ¶50
  • Claim 1 of the '831 Patent includes the following essential elements:
    • defining a boundary of a construction site;
    • identifying a longest edge of the boundary;
    • defining a path orientation for the autonomous construction vehicle that is parallel to the longest edge of the boundary;
    • defining a start point for the autonomous construction vehicle;
    • defining a maneuver area for the autonomous construction vehicle based on the boundary and specifications of the vehicle;
    • defining a path for the vehicle to navigate the site, oriented according to the path orientation;
    • automatically creating a site plan indicating the boundary, path, start point, and maneuver area; and
    • controlling the operation of the vehicle based on the site plan.
  • The complaint reserves the right to assert infringement of other claims '831 Patent, claim 1 Compl. ¶49

U.S. Patent No. 11,111,644 ("the '644 Patent"), "SYSTEM AND METHOD FOR PERFORMING OPERATIONS ON A WORKSITE SURFACE," issued September 7, 2021.

  • Technology Synopsis: As a continuation of the '943 Patent, the '644 Patent describes a method where a system receives data defining a worksite perimeter and specific operational requirements. It then generates a plan indicating a travel path and the operations (e.g., compaction) to be performed by the machine along that path, and subsequently causes the machine to execute the plan '644 Patent, abstract Compl. ¶76
  • Asserted Claims: Claim 1 is asserted Compl. ¶76
  • Accused Features: The complaint alleges Bluelight's kits receive user-defined perimeters and operational requirements (e.g., pass count), generate a plan with a travel path, and cause the machine to perform compaction along that path Compl. ¶¶81-86

U.S. Patent No. 11,531,338 ("the '338 Patent"), "AUTOMATIC CONTROL MODE SYSTEM FOR HEAVY MACHINERY," issued December 20, 2022.

  • Technology Synopsis: This patent discloses a "failsafe" system for an autonomous vehicle. The system monitors positional conditions, including the accuracy of its geolocation, which it may receive from different remote systems (e.g., a high-accuracy RTK base station vs. standard GPS satellites) '338 Patent, abstract It determines if a predefined accuracy threshold is met and disables the automatic control mode if the accuracy falls below that threshold '338 Patent, col. 2:7-14
  • Asserted Claims: Claim 7 is asserted Compl. ¶103
  • Accused Features: Bluelight's system is alleged to use RTK for high-accuracy positioning, monitor whether the RTK signal provides sufficient accuracy, and implement a "failsafe" to stop the machine if "good RTK" is lost, thereby disabling automatic control when the accuracy threshold is not met Compl. ¶¶111-113

U.S. Patent No. 11,629,472 ("the '472 Patent"), "SYSTEM AND METHOD FOR PERFORMING OPERATIONS ON A WORKSITE SURFACE," issued April 18, 2023.

  • Technology Synopsis: This patent describes a system that allows for dynamic modification of a site plan. After an initial travel path or boundary is determined and displayed, the system can receive second data representing a user's modification to that path or boundary '472 Patent, abstract In response, the system determines and displays a new, different travel path or boundary based on the user's edits '472 Patent, abstract
  • Asserted Claims: Claim 8 is asserted Compl. ¶130
  • Accused Features: The complaint alleges that Bluelight's kits include an "edit job" functionality that allows a user to modify a previously defined job boundary. This modification is alleged to constitute receiving "second data," which causes the system to determine and display a "second boundary" and a "second travel path" different from the first ones Compl. ¶¶140-141

III. The Accused Instrumentality

Product Identification

  • The accused products are Bluelight's "Roller Kit" and "Truck Kit," which include associated hardware and software Compl. ¶18

Functionality and Market Context

  • The Accused Products are aftermarket kits designed to convert conventional heavy construction equipment into autonomous machines Compl. ¶5 The complaint alleges these kits allow a user to define a job perimeter on a digital map using tools like "Draw" or "Machine Track" Compl. ¶27 The user can then specify operational parameters, such as pass count and overlap Compl. ¶28 After the user initiates the job, the Accused Products are alleged to take control of the machine's steering and other functions to autonomously execute the planned task Compl. ¶33 The complaint highlights that Bluelight's kits are marketed as compatible with over 32 different Caterpillar machines Compl. ¶5 A screenshot provided in the complaint shows the user interface for defining a job perimeter with a "Draw" tool Compl. ¶27

IV. Analysis of Infringement Allegations

Infringement Allegations for the '943 Patent

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
receiving first information indicative of a location of a perimeter of a worksite surface; The Accused Products allegedly receive user-defined perimeter data via "Draw," "Machine Track," or "My Track" tools on a control interface. ¶27 col. 11:1-21
receiving second information indicative of compaction requirements specific to the worksite surface; The user is allegedly instructed to "Choose the desired overlap and number of passes required for compaction," which the system receives as input. ¶28 col. 11:53-66
generating a compaction plan based at least partly on the first and second information, wherein generating the compaction plan includes determining a travel path...substantially within the perimeter of the worksite surface; After receiving perimeter and requirement data, the user selects "Upload Job," which allegedly causes the Accused Products to generate a compaction plan that includes a travel path within the defined perimeter. ¶29; ¶30 col. 12:45-54
causing at least part of the determined travel path to be displayed via a control interface of the compaction machine; The Accused Products allegedly display the determined travel path on the control interface screen after the user selects "Upload Job." ¶31 col. 13:50-54
receiving an input indicative of approval of the determined travel path; The Accused Products allegedly receive an input when the user toggles a "Swipe to Go" button to start the job. ¶32 col. 13:55-58
and controlling operation of the compaction machine on the worksite surface, in accordance with the compaction plan, based at least partly on receiving the input. After the "Swipe to Go" input, the Accused Products allegedly use "Electronically controlled steering" to perform "Autonomous Navigation" and control the machine's operation in accordance with the plan. ¶33 col. 13:59-65
  • Identified Points of Contention:
    • Scope Questions: The claim requires "receiving an input indicative of approval." The complaint alleges this is met by the "Swipe to Go" button, which initiates the job Compl. ¶32 A potential dispute is whether a command that simultaneously starts an operation can be considered an "approval" in the sense claimed. The patent's specification illustrates a distinct approval step with "YES" and "NO" options, separate from initiating machine movement, which may suggest a narrower interpretation of the term '943 Patent, FIG. 8 '943 Patent, col. 8:1-11
    • Technical Questions: The claim requires generating a plan and then receiving an approval input. The court may need to determine if the accused product's workflow-where a user defines parameters and then swipes to start the job-functionally separates plan generation from approval in the manner required by the claim.

Infringement Allegations for the '831 Patent

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
defining a boundary of a construction site; The Accused Products allegedly allow a user to define a boundary using a "Draw," "Machine Track," or "My Track" tool. ¶56 col. 9:20-22
identifying a longest edge of the boundary; The Accused Products are alleged to automatically identify the longest edge of the user-defined boundary to establish a path orientation. ¶57 col. 10:18-22
defining path orientation for the autonomous construction vehicle that is parallel to the longest edge of the boundary; The system allegedly defines a path orientation that is parallel to the identified longest edge of the boundary. A screenshot shows a visual representation of the longest edge and the resulting path orientation. ¶57 col. 10:18-22
defining a start point for the autonomous construction vehicle; The Accused Products are alleged to define a "Start Point" for the autonomous vehicle's operation. ¶58 col. 10:33-40
defining a maneuver area for the autonomous construction vehicle based on the boundary and specifications of the autonomous construction vehicle; The system allegedly defines a maneuver area based on the boundary and vehicle specifications, such as pass overlap, to allow for turns between passes. ¶58 col. 11:22-31
defining a path for the autonomous construction vehicle to navigate the construction site, wherein the path is oriented according to the path orientation...; The system allegedly defines a travel path consisting of multiple passes, with the path's overall orientation determined by the previously defined path orientation. ¶57 col. 11:40-45
automatically creating a site plan indicating the boundary, path, start point, and maneuver area; The complaint alleges the Accused Products automatically create a site plan that visually represents the boundary, path, start point, and maneuver area. ¶58 col. 2:41-47
and controlling the operation of the autonomous construction vehicle based on the site plan. After a user provides a "Swipe to Go" input, the Accused Products allegedly control the vehicle's operation based on the automatically created site plan. ¶59 col. 2:45-47
  • Identified Points of Contention:
    • Scope Questions: The claim requires "identifying a longest edge of the boundary" and defining a path "parallel" to it. The infringement analysis may turn on whether the accused product's algorithm for path orientation strictly and always aligns with the mathematically longest edge of any given polygonal boundary, or if it uses a different heuristic that might not always result in a parallel path.
    • Technical Questions: The claim recites "automatically creating a site plan." A potential issue is whether the initial manual user input to "defin[e] a boundary" precludes the subsequent plan creation from being considered "automatic" as required by the claim.

V. Key Claim Terms for Construction

  • For the '943 Patent:

    • The Term: "input indicative of approval"
    • Context and Importance: This term's construction is critical because the accused functionality is a "Swipe to Go" command that starts the job Compl. ¶32, whereas the patent specification explicitly shows a separate "Approve Compaction Plan?" dialog with "YES" and "NO" buttons '943 Patent, FIG. 8 The case may turn on whether "approval" can be collapsed into a "start" command or if it must be a distinct, preceding step.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The claim language itself does not specify the form of the input, only that it is "indicative of approval." The method steps in the patent are presented as an "example" method, which may support an argument that the specific "YES/NO" embodiment is not the only way to practice the invention ('943 Patent, col. 10:15-18).
      • Evidence for a Narrower Interpretation: The patent's abstract and claim 1 list "receiving an input indicative of approval" and "controlling operation...based at least partly on receiving the input" as separate steps, which may suggest two distinct user actions. Furthermore, the detailed description of FIG. 8 describes the approval step as a predicate to further action, reinforcing the idea of a separate confirmation ('943 Patent, col. 19:27-40).

  • For the '831 Patent:

    • The Term: "automatically creating a site plan"
    • Context and Importance: The infringement allegation hinges on the system creating the plan after the user defines the boundary (Compl. ¶58). Practitioners may focus on this term because the degree of user involvement (defining the boundary) may be argued by a defendant to negate the "automatic" nature of the overall plan creation.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The patent's summary states the method includes "automatically creating a site plan for navigating the autonomous construction vehicle within the boundary," suggesting the entire process is viewed as automatic, even with an initial user-defined boundary '831 Patent, col. 2:51-54 The sequence of steps following the boundary definition (identifying longest edge, defining orientation, etc.) appear to be performed without further user input.
      • Evidence for a Narrower Interpretation: The claim is a method claim with a series of steps, the first of which is "defining a boundary." The complaint itself shows this is a manual user action (Compl. ¶56). A defendant may argue that if the foundational step is manual, the subsequent creation of the plan is not fully "automatic" but rather a computer-assisted process initiated by a user.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges both induced and contributory infringement.
    • Inducement is primarily based on allegations that Bluelight provides marketing materials, instructional videos on its website and YouTube, and technical support that instruct and encourage end-users to operate the Accused Products in a manner that directly infringes the patents-in-suit (Compl. ¶26; Compl. ¶54; Compl. ¶80; Compl. ¶107; Compl. ¶134).
    • Contributory infringement is based on allegations that Bluelight sells components (e.g., "BL-GPS-ANTENNA," "BL-AUTOPILOT C-set," steering motor, and software) that are material parts of the patented inventions, are especially made for use in an infringing way, and have no substantial non-infringing uses (Compl. ¶38; Compl. ¶64; Compl. ¶91; Compl. ¶118; Compl. ¶146).
  • Willful Infringement: Willfulness is alleged based on two grounds. First, the complaint alleges Bluelight knew or should have known of Caterpillar's patents due to its business being "effectively built on Caterpillar's patented technology" Compl. ¶4 Second, it alleges Bluelight had, at a minimum, actual knowledge of the patents-in-suit as of May 14, 2026, when it received a demand letter from Caterpillar, and continued its allegedly infringing conduct thereafter Compl. ¶4 Compl. ¶23

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

  • A core issue will be one of definitional scope: for the '943 Patent, can the claim term "input indicative of approval" be construed to cover a single user action that both confirms and initiates a job (the accused "Swipe to Go"), or does the patent require a discrete confirmation step separate from a "start" command, as depicted in its own embodiment?
  • A key evidentiary question will be one of operational equivalence: for the '831 Patent, does the accused system's algorithm for determining "path orientation" perform the specific function of identifying the "longest edge of the boundary" and creating a "parallel" path as claimed, or does it use a technically distinct, non-infringing heuristic?
  • A central question for damages will concern willfulness: can Plaintiff establish that Defendant had pre-suit knowledge or was willfully blind to the asserted patents based on market context and development history, or will any potential finding of willfulness be limited to conduct that occurred after Defendant's receipt of the May 14, 2026 demand letter?
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