DCT
1:26-cv-00151
Tonal Systems Inc v. Echelon Fitness Multimedia LLC
Key Events
Complaint
Table of Contents
complaint Intelligence
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: Tonal Systems, Inc. (Delaware)
- Defendant: Echelon Fitness Multimedia LLC (Delaware)
- Plaintiff's Counsel: McCarter & English, LLP (Of Counsel: Morrison & Foerster LLP)
- Case Identification: 1:26-cv-00151, D. Del., 02/10/2026
- Venue Allegations: Venue is alleged to be proper in this district under 28 U.S.C. § 1400(b), based on Defendant Echelon Fitness Multimedia LLC being a Delaware limited liability company.
- Core Dispute: Plaintiff alleges that Defendant's Echelon Strength Pro, a digital home gym, infringes four patents related to digital strength-training architecture, interactive workout control, and safety features.
- Technical Context: The technology at issue involves compact, digitally-controlled home exercise machines that use electric motors to provide resistance, replacing traditional physical weights.
- Key Procedural History: The complaint details pre-suit communications, beginning with a notice letter from Plaintiff to Defendant on October 31, 2025, which included infringement contentions and claim charts for the asserted patents. This history is central to the allegations of willful infringement.
Case Timeline
| Date | Event |
|---|---|
| 2008-11-16 | U.S. Patent No. 8,287,434 Priority Date |
| 2011-05-19 | U.S. Patent No. 8,287,434 Filed |
| 2012-10-16 | U.S. Patent No. 8,287,434 Issued |
| 2015 | Tonal Systems, Inc. Founded |
| 2017-10-02 | U.S. Patent No. 11,324,983 Priority Date |
| 2018-08-09 | U.S. Patent No. 11,806,581 Priority Date |
| 2018-08-14 | U.S. Patent No. 11,426,618 Priority Date |
| 2019-08-12 | U.S. Patent No. 11,426,618 Filed |
| 2020-10-27 | U.S. Patent No. 11,324,983 Filed |
| 2022-05-10 | U.S. Patent No. 11,324,983 Issued |
| 2022-08-30 | U.S. Patent No. 11,426,618 Issued |
| 2023-08-15 | Echelon Strength Pro Offered for Sale (since at least this date) |
| 2023-11-07 | U.S. Patent No. 11,806,581 Issued |
| 2025-10-31 | Plaintiff sends notice letter to Defendant |
| 2025-11-12 | Defendant sends response letter to Plaintiff |
| 2025-11-21 | Plaintiff sends follow-up letter to Defendant |
| 2026-02-10 | Complaint Filed |
II. Technology and Patent(s)-in-Suit Analysis
U.S. Patent No. 11,324,983 - Exercise Machine with Pancake Motor
- Patent Identification: U.S. Patent No. 11,324,983, "Exercise Machine with Pancake Motor," issued May 10, 2022 (the '983 Patent).
The Invention Explained
- Problem Addressed: The complaint states that conventional gym equipment relies on gravity and bulky metal plates, making it impractical for a compact home gym setting Compl. ¶8
- The Patented Solution: The invention uses a proprietary, low-profile digital motor (referred to as a "pancake motor") and a cable-based resistance system to simulate traditional weights without the need for large weight stacks Compl. ¶12 Resistance is delivered through vertically pivotable arms that can be locked into various positions to accommodate different exercises, with the cable traveling within the arm itself '983 Patent, Fig. 4 '983 Patent, col. 18:8-25
- Technical Importance: This motor-driven architecture enables a compact, space-saving design for a full-featured strength training machine suitable for wall-mounting in a home Compl. ¶9 Compl. ¶12
Key Claims at a Glance
- The complaint asserts at least independent Claim 1 Compl. ¶36
- Claim 1 Elements:
- An exercise machine including:
- a motor;
- an actuator;
- a vertically pivotable arm, wherein a position of the arm is able to be locked at least in part by using a component including one or more teeth, wherein the one or more teeth have a trapezoidal shape;
- a cable coupled between the actuator and the motor;
- wherein: the vertically pivotable arm positions the cable, and the cable travels within the arm; and
- the motor facilitates strength training at least in part by generating resistance such that a force on the actuator corresponds to a specified weight.
- The complaint does not explicitly reserve the right to assert dependent claims for this patent, but makes a general prayer for relief on "one or more claims" of the Asserted Patents Compl. ¶¶34-35 Compl., prayer a
U.S. Patent No. 8,287,434 - Method and Apparatus for Facilitating Strength Training
- Patent Identification: U.S. Patent No. 8,287,434, "Method and Apparatus for Facilitating Strength Training," issued October 16, 2012 (the '434 Patent).
The Invention Explained
- Problem Addressed: The patent's background notes that existing exercise video games are limited in their ability to facilitate strength training because they are either unaware of the resistance level or cannot control it, preventing an efficient, interactive workout regimen '434 Patent, col. 1:36-46
- The Patented Solution: The invention describes a method where a "video gaming system" facilitates strength training by communicating with an exercise device '434 Patent, abstract The system can monitor user progress and provide audio/video feedback, and crucially, it can adjust the resistance force during the exercise, allowing for different magnitudes of force even at the same position in the movement (e.g., for concentric vs. eccentric phases) '434 Patent, abstract '434 Patent, col. 2:60-67
- Technical Importance: The technology integrates interactive, responsive video content with dynamically adjustable electronic resistance, making workouts more precise and effective than is possible with static weights Compl. ¶14
Key Claims at a Glance
- The complaint asserts at least independent Claim 1 Compl. ¶48
- Claim 1 Elements:
- A method of facilitating strength training exercise by a person using a video gaming system, wherein at least one processor of the video gaming system performs at least the following steps:
- a) communicate a first information with an exercise device, the first information indicative of a resistance force during said strength training exercise,
- b) monitor progress of said strength training exercise,
- c) supply information for a video or an audio signal indicative of the exercise progress;
- wherein said resistance force can be adjusted, so there is a first magnitude of the resistance force associated with a position during exercise movement, and a second magnitude of the resistance force associated with substantially the same position, the first magnitude substantially different from the second magnitude.
- The complaint does not explicitly reserve the right to assert dependent claims for this patent, but makes a general prayer for relief on "one or more claims" of the Asserted Patents Compl. ¶¶46-47 Compl., prayer a
U.S. Patent No. 11,426,618 - Racking and Unracking Exercise Machine
- Patent Identification: U.S. Patent No. 11,426,618, "Racking and Unracking Exercise Machine," issued August 30, 2022 (the '618 Patent).
- Technology Synopsis: The invention addresses safety and workflow in digital strength training by allowing a user to digitally "rack" (remove tension) and "unrack" (apply tension) the weight via on-device controls Compl. ¶13 The system includes software logic to manage these commands and prevent unsafe operations, such as re-engaging resistance while an "unrack" process is still processing, reducing the risk of sudden or unintended resistance engagement Compl. ¶13
- Asserted Claims: At least Claim 1 Compl. ¶60
- Accused Features: The accused feature is the button on the handles of the Echelon Strength Pro that allows a user to "pause and resume resistance" Compl. ¶25
U.S. Patent No. 11,806,581 - Control Sequence Based Exercise Machine Controller
- Patent Identification: U.S. Patent No. 11,806,581, "Control Sequence Based Exercise Machine Controller," issued November 7, 2023 (the '581 Patent).
- Technology Synopsis: The invention relates to adaptive user-interface technology that synchronizes instructional content with a user's actual movements during a workout Compl. ¶15 It uses a "time flex" feature to pause, delay, or advance video and audio content based on the user's pace and progress, ensuring guidance remains aligned with the user's performance rather than a fixed timeline Compl. ¶15
- Asserted Claims: At least Claim 1 Compl. ¶72
- Accused Features: The functionality in the Echelon Strength Pro that allows a user to add a rest period between exercises, which the complaint alleges requires the system to determine when a user is ready to move to the next exercise.
III. The Accused Instrumentality
Product Identification
- The Echelon Strength Pro (the "Infringing Product") Compl. ¶16
Functionality and Market Context
- The complaint alleges the Echelon Strength Pro is a digital strength-training machine that uses an electric motor to provide resistance, features an interactive content display, and has an adjustable dual-arm design Compl. ¶17
- Key accused technical features include: a vertically pivotable arm with a toothed locking mechanism Compl. ¶18; handle-integrated buttons to "pause and resume resistance" Compl. ¶19 Compl. ¶25; and software-enabled "resistance modes" such as "Concentric," which adjusts resistance during specific phases of an exercise Compl. ¶20 This image from the complaint shows the product's marketing for its handle-integrated controls Compl. ¶19
- The complaint alleges Echelon directly targets Tonal customers by emphasizing the similarity of these features to Tonal's own patented technology Compl. ¶17
IV. Analysis of Infringement Allegations
'983 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| a vertically pivotable arm, wherein a position of the arm is able to be locked at least in part by using a component including one or more teeth, wherein the one or more teeth have a trapezoidal shape; | The Echelon Strength Pro has vertically pivotable arms with a locking mechanism. The mechanism includes a wheel with multiple teeth that the complaint alleges have a trapezoidal shape, as shown in product photos. | ¶18; ¶23 | col. 19:20-28 |
| the vertically pivotable arm positions the cable, and the cable travels within the arm; | The complaint alleges the Echelon Strength Pro has vertically pivotable arms (¶18); the record does not identify a complaint paragraph specifically alleging that the accused cables are routed through and travel within the arms. | ¶18 | col. 14:35-44 |
| the motor facilitates strength training at least in part by generating resistance such that a force on the actuator corresponds to a specified weight. | The Echelon Strength Pro uses a digital motor to generate resistance, which is delivered through the cables and corresponds to a weight selected by the user. | ¶17; ¶20 | col. 8:1-9 |
'434 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| A method of facilitating strength training exercise by a person using a video gaming system... | The Echelon Strength Pro includes an interactive tablet and is used with the Echelon Fit app, which collectively function as a "video gaming system" by providing interactive classes, challenges, and progress tracking. | ¶17; ¶48 | col. 4:48-62 |
| c) supply information for a video or an audio signal indicative of the exercise progress; | The Echelon Strength Pro's screen displays real-time exercise progress, including workout stats like reps, time under tension, and calories burned. | ¶48; ¶14 | col. 16:40-45 |
| wherein said resistance force can be adjusted... [with a] first magnitude substantially different from the second magnitude. | The product's "resistance modes," such as "Concentric," apply different resistance magnitudes for the lifting versus lowering portions of an exercise at the same position. | ¶14; ¶20 | col. 2:60-67 |
- Identified Points of Contention:
- Scope Questions: The primary disputes appear to center on claim construction. For the '983 Patent, the analysis will turn on whether the accused product's locking mechanism teeth meet the claim's "trapezoidal shape" limitation Compl. ¶23-24 For the '434 Patent, a key question is whether the combination of the Echelon Strength Pro and its associated app constitutes a "video gaming system" as defined in the patent Compl., Ex. 7 For the '618 Patent, the dispute involves whether "pausing" resistance is equivalent to "racking" it Compl. ¶25, and for the '581 patent, whether adding rest periods between sets requires the use of "time flex".
- Technical Questions: A factual dispute is presented regarding the '983 patent's "trapezoidal teeth" element. The complaint includes a side-by-side comparison of a patent figure and a photo of the accused product's locking gear, alleging the teeth are trapezoidal, while quoting the defendant's argument that they are rectangular Compl. ¶23 A second factual question relates to the '618 patent, where the complaint alleges the accused product's "Pause & Resume" feature Compl. ¶25 performs the claimed racking, while the defendant allegedly argued it could only "incrementally adjust" weight Compl. ¶25
V. Key Claim Terms for Construction
The Term: "trapezoidal shape" ('983 Patent, Claim 1)
- Context and Importance: The infringement analysis for the '983 Patent appears to hinge on this term. The complaint alleges Defendant's primary non-infringement argument is that its locking teeth are "rectangular rather than trapezoidal" Compl. ¶23 Practitioners may focus on this term as its construction will likely determine literal infringement.
- Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The claim requires the position of the arm to be locked "at least in part" by a component with trapezoidal teeth, which Tonal argues means only one of the interlocking components needs the feature. The patent does not provide an explicit definition beyond its plain and ordinary meaning.
- Evidence for a Narrower Interpretation: The specification describes a specific embodiment where "teeth (422) and matching female locking member (722) use a trapezoidal shape" to ensure a tight coupling and minimize "wiggle" '983 Patent, col. 19:20-28 A party could argue that this functional purpose limits the scope to shapes that achieve this specific anti-wiggle function. The complaint includes an image from the patent, Figure 6, illustrating this specific embodiment Compl. ¶23
The Term: "video gaming system" ('434 Patent, Claim 1)
- Context and Importance: Defendant allegedly argues it does not infringe because the accused product does not use the "FitOS platform". Plaintiff counters that the product's use of the "Echelon Fit app" with interactive classes, leaderboards, and challenges makes it a "video gaming system" regardless of name. The construction of this term is therefore critical.
- Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The patent defines the term broadly as an "interactive entertainment computer or electronic device that produces a video display signal" ('434 Patent, col. 4:50-53). This could encompass the accused product's integrated tablet and app.
- Evidence for a Narrower Interpretation: The specification explicitly distinguishes a "video gaming system" from "specialized exercise computers" and provides "WII, XBox, PlayStation, Personal computer" as examples '434 Patent, col. 5 A party may argue the accused product's integrated system is a "specialized exercise computer" and not a general-purpose system like the examples listed.
VI. Other Allegations
- Indirect Infringement: The complaint alleges active inducement of infringement for all four patents. The basis for this allegation is that Echelon "actively encourages and instructs" customers to use the Infringing Product in an infringing manner through its "website marketing, product descriptions, and instructional content" Compl. ¶36 Compl. ¶48 Compl. ¶60 Compl. ¶72
- Willful Infringement: The complaint alleges willful and deliberate infringement for all four patents. The basis is Defendant's alleged knowledge of the patents and infringement "at least as of October 31, 2025," the date Plaintiff sent a detailed notice letter with claim charts Compl. ¶21 Compl. ¶39 Compl. ¶51 Compl. ¶63 Compl. ¶75 The complaint further supports this allegation by detailing the subsequent correspondence, characterizing Defendant's non-infringement arguments as "objectively baseless" and "shifting," suggesting a lack of a good-faith belief of non-infringement Compl. ¶¶22-27
- Relief Sought: In its prayer for relief, the complaint seeks a permanent injunction against Echelon's continued infringement, an award of damages including enhanced damages up to and including trebling, and a finding that this case is exceptional under 35 U.S.C. § 285 with an award of attorneys' fees and costs Compl., prayer c Compl., prayer d Compl., prayer e
- Pre-Suit Damages (Marking): The complaint alleges Tonal has complied with the marking requirement of 35 U.S.C. § 287, supporting its entitlement to recover pre-suit damages Compl. ¶41
- Jury Demand: The complaint demands a trial by jury on all issues so triable Compl., Jury Demand
VII. Analyst's Conclusion: Key Questions for the Case
- A core issue will be one of definitional scope: The case will likely turn on claim construction. Can the term "trapezoidal shape" be construed to read on the accused product's gear teeth? Does the Echelon Strength Pro, with its integrated tablet and app ecosystem, qualify as a "video gaming system" under the patent's definition? Do the product's "pause" and "add rest" features perform the functions of "racking" and "time flex" as claimed?
- A second key question will be one of technical and factual evidence: The dispute over the shape of the locking teeth in the '983 patent will require factual evidence to resolve whether they are rectangular or trapezoidal. Similarly, the operational details of the accused software-how it handles user inputs, pauses, and workout progression-will be central to adjudicating the infringement allegations for the '618 and '581 patents.
- Finally, a central question for damages will be willfulness: Did Defendant's conduct after receiving a detailed notice letter on October 31, 2025, rise to the level of willful infringement? The court will need to evaluate the pre-suit correspondence to determine if Defendant's non-infringement positions were objectively reasonable or constituted a deliberate disregard for Plaintiff's patent rights.
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