Encelion LLC v. Whoop Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Encelion LLC (New Mexico)
  • Defendant: Whoop, Inc. (Delaware)
  • Plaintiff's Counsel: Silverman, McDonald & Friedman; Rabicoff Law LLC
• Case Identification: 1:26-cv-00308, D. Del., 03/23/2026
• Venue Allegations: Plaintiff alleges venue is proper in the District of Delaware because Defendant is incorporated in Delaware and has an established place of business in the district.
• Core Dispute: Plaintiff alleges that Defendant's wearable sensor products infringe a patent related to non-invasive pulse sensing technology used to monitor physiological conditions.
• Technical Context: The technology at issue falls within the wearable health and fitness monitoring sector, focusing on methods for sensing and interpreting arterial pulse waves to derive physiological data.
• Key Procedural History: The complaint does not mention any prior litigation, licensing history, or administrative proceedings related to the patent-in-suit.

Case Timeline

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

U.S. Patent No. 11,471,072 - "Pulse sensor, system, and method for using a pulse sensor"

The Invention Explained

• Problem Addressed: The patent addresses the need to non-invasively monitor a person's physiological state, particularly hydration, by analyzing the characteristics of their arterial pulse wave '072 Patent, col. 1:11-15 Changes in hydration can alter blood viscosity, which in turn affects the shape of the pulse wave as it travels through peripheral arteries '072 Patent, col. 1:16-33
• The Patented Solution: The invention proposes a sensor that uses a magnet placed over an artery, which moves in response to the physical expansion and contraction of the artery during a pulse '072 Patent, abstract A magnetometer detects the resulting changes in the magnetic field, translating the physical pulse motion into an electronic signal '072 Patent, col. 6:54-61 The system analyzes this signal to measure not just the pulse rate, but also the "modulation" of the pulse wave-specifically, the shape and magnitude of the wave, including the ratio between the main systolic peak and a smaller, secondary "diastolic hump" '072 Patent, col. 16:46-52 This modulation data is then used to infer the user's hydration status '072 Patent, col. 1:56-63
• Technical Importance: This approach offers a method for estimating a user's hydration level without requiring more invasive procedures or complex equipment like blood pressure cuffs '072 Patent, col. 1:39-45

Key Claims at a Glance

• The complaint does not assert any specific claims. It states that infringement allegations are detailed in "charts incorporated into this Count" which are part of an "Exhibit 2" Compl. ¶11 Compl. ¶16 This exhibit was not provided with the filed complaint. Therefore, the specific asserted independent and dependent claims are not identified in the available document.

III. The Accused Instrumentality

Product Identification

• The complaint does not name specific accused products. It refers to them as "Exemplary Defendant Products" that are identified in the charts of the unprovided Exhibit 2 Compl. ¶11

Functionality and Market Context

• The complaint alleges that Defendant makes, uses, sells, and imports these products Compl. ¶11 It also alleges that Defendant's employees internally test and use the products Compl. ¶12 The functionality of the accused products is not described in technical detail, other than that they are alleged to "practice the technology claimed by the '072 Patent" Compl. ¶16
• No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint incorporates infringement allegations by reference to claim charts in an "Exhibit 2," which was not provided with the complaint Compl. ¶16 Compl. ¶17 As such, a detailed claim chart summary cannot be constructed.

• Identified Points of Contention: The complaint does not provide sufficient detail for analysis of specific points of contention. A central question, once the asserted claims are identified, may be whether the sensing mechanism in the accused products operates in a manner consistent with the magnetically-based system claimed in the '072 Patent. For example, many commercial wearable sensors use optical photoplethysmography (PPG) to detect blood volume changes, which may raise questions regarding how such a mechanism meets the limitations of claims directed to detecting the physical motion of an artery via a magnet and magnetometer.

V. Key Claim Terms for Construction

The complaint does not provide sufficient detail for analysis of key claim terms, as no specific claims are asserted in the document.

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement, stating that Defendant sells the accused products to customers and distributes "product literature and website materials" that direct end users to use the products in an infringing manner Compl. ¶14 Compl. ¶15
• Willful Infringement: The complaint does not use the term "willful," but it alleges that service of the complaint and its attached (but unprovided) claim charts constitutes "Actual Knowledge of Infringement" Compl. ¶13 It further alleges that Defendant has continued its infringing activities despite this knowledge, which may form the basis for a future claim of post-suit willfulness Compl. ¶14

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

Based on the initial pleading, the dispute appears to center on the following high-level questions for the court:

• Pleading Sufficiency: A threshold issue may be whether the complaint, which relies entirely on an unprovided external exhibit to detail its core infringement allegations, meets federal pleading standards. The lack of asserted claims or specific factual allegations mapping product features to claim elements in the body of the complaint may be a point of early motion practice.
• Technological Equivalence: Assuming the case proceeds, a key technical question will likely be one of operational principle: do the accused products, which are part of a product line known to use optical sensors, infringe claims directed to a pulse-sensing system based on a physically moving magnet and a magnetometer? The analysis will likely focus on whether the different technological approaches are equivalent under the law.
• Claim Scope: The central dispute will turn on the definitional scope of the asserted claims, once identified. The construction of terms relating to the magnetic sensing components and the specific "modulation" analysis will be critical in determining whether the patent's scope is broad enough to cover the technology used in the accused products.