Slyde Analytics LLC v. Xiaomi Corp

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Slyde Analytics LLC (Texas)
  • Defendant: Xiaomi Corporation (Cayman Islands); Xiaomi H.K. Ltd. (Hong Kong); Xiaomi Communications Co., Ltd. (People's Republic of China); Xiaomi, Inc. (People's Republic of China)
  • Plaintiff's Counsel: Fabricant, Rubino & Lambrianakos LLP; Rubino IP
• Case Identification: 2:26-cv-00415, E.D. Tex., 05/19/2026
• Venue Allegations: Venue is alleged to be proper under the alien-venue rule, 28 U.S.C. § 1391(c)(3), on the basis that the defendants are not residents of the United States and may be sued in any judicial district.
• Core Dispute: Plaintiff alleges that Defendant's smartwatches and fitness tracking devices infringe five U.S. patents related to power management, user interface navigation, and biomechanical analysis for wearables.
• Technical Context: The technology at issue resides in the competitive wearable electronics market, focusing on core smartwatch functionalities such as battery-saving wake-up gestures, touch-screen navigation, and athletic performance monitoring.
• Key Procedural History: The complaint alleges that Defendant had pre-suit knowledge of the Patents-in-Suit due to Plaintiff's prior infringement lawsuits involving the same patents against several of Defendant's major competitors, including Samsung, Zepp Health, Garmin, and Apple. These prior cases and associated industry publications are cited as a basis for the willfulness allegations.

Case Timeline

Date	Event
2009-07-03	'922 Patent Priority Date
2010-06-16	'018 Patent Priority Date
2011-06-17	'134 Patent Priority Date
2011-10-18	'678 and '085 Patents Priority Date
2017-01-03	'134 Patent Issued
2017-05-16	'922 Patent Issued
2017-10-31	'678 Patent Issued
2018-01-23	'018 Patent Issued
2019-02-05	'085 Patent Issued
2023-02-28	Plaintiff filed suit against Samsung Electronics Co.
2023-04-14	Plaintiff filed suit against Zepp Health Corp.
2024-03-27	Plaintiff filed suit against Garmin Ltd.
2024-05-06	Plaintiff filed suit against Apple Inc.
2025-01-10	Defendant debuted Redmi Watch 5 at CES 2025
2026-05-19	Complaint Filing Date

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

U.S. Patent No. 9,804,678 - "Method and Circuit for Switching a Wristwatch from a First Power Mode to a Second Power Mode"

The Invention Explained

• Problem Addressed: The patent describes the difficulty in reliably waking a device from a low-power 'sleep mode' '678 Patent, background Simple gesture detection using an accelerometer often results in undesirable activations from normal arm movements, leading to unnecessary power consumption '678 Patent, col. 2:5-16
• The Patented Solution: The invention proposes a more robust wake-up system by combining inputs from two different sensors: an inertial sensor (e.g., an accelerometer) and a touch panel '678 Patent, abstract The method uses the accelerometer to first detect a potential gesture, which then wakes the touch controller for confirmation. This dual-factor authentication for gestures, which discriminates between intentional taps and other movements based on signal characteristics like frequency, direction, or slope, aims to prevent accidental wake-ups '678 Patent, col. 2:35-56
• Technical Importance: This technology aimed to improve battery life and the user experience in early-generation smartwatches by creating a more reliable mechanism to transition from a sleep state to an active state. '678 Patent, col. 2:52-56

Key Claims at a Glance

• The complaint asserts at least Claim 1 Compl. ¶35
• The essential elements of independent Claim 1, a method claim, include:
  • Combining gesture detection from an inertial sensor and a touch panel to switch a wristwatch between power modes.
  • Using an accelerometer to generate an acceleration signal while the device is in a sleep power mode.
  • Using a processor of the inertial sensor to discriminate between a gesture and no gesture based on the direction, slope, or frequency of the acceleration signal.
  • Waking up the touch controller in response to a gesture detected by the inertial sensor.
  • Using the touch controller to detect a tap gesture.
  • Waking up the microcontroller upon detection of the tap gesture by the touch controller.
  • Using the microcontroller to further discriminate between gesture and no gesture based on signals from the touch panel.
• The complaint asserts infringement of "one or more claims" of the patent, focusing its allegations on Claim 1 Compl. ¶34 Compl. ¶35

U.S. Patent No. 10,198,085 - "Method and Circuit for Switching a Wristwatch from a First Power Mode to a Second Power Mode"

The Invention Explained

• Problem Addressed: Like its related '678 Patent, the '085 Patent addresses the problem of unwanted device activations that drain battery life in wrist-worn devices '085 Patent, background
• The Patented Solution: This invention details a specific method for a "raise-to-wake" function by detecting a "wristturn" gesture '085 Patent, col. 9:36-43 The method uses an accelerometer to verify a sequence of conditions: (1) the watch starts in a first orientation range (e.g., arm down), (2) it moves to a second, different orientation range (e.g., raised for viewing), (3) it remains substantially immobile in the final position for a set duration, and (4) the time taken to move between the positions is within a predefined range '085 Patent, claim 1 This multi-condition check is designed to reliably distinguish an intentional viewing gesture from other incidental arm movements '085 Patent, col. 9:60-10:37
• Technical Importance: The invention provides a specific, logic-based framework for implementing raise-to-wake functionality, a key convenience feature in the smartwatch market, while seeking to maintain power efficiency '085 Patent, col. 9:36-43

Key Claims at a Glance

• The complaint asserts at least Claim 1 Compl. ¶51
• The essential elements of independent Claim 1, a method claim, include:
  • Switching a wristwatch between power modes upon the detection of a "wristturn" via an accelerometer.
  • Detecting that the watch is in a starting orientation within a first range for a defined time.
  • Detecting that the watch moves to a final orientation in a second, different range.
  • In response to being in the final orientation, detecting that the watch remains substantially immobile for a predetermined duration.
  • Detecting that the duration of movement between the starting and final positions is within a predefined range.
• The complaint asserts infringement of "one or more claims" of the patent, focusing its allegations on Claim 1 Compl. ¶50 Compl. ¶51

U.S. Patent No. 9,651,922 - "Wristwatch with a Touch Screen and Method for Displaying on a Touch-Screen Watch"

• Technology Synopsis: The patent addresses user interface navigation on small watch screens '922 Patent, col. 1:12-16 It describes a method where a user swipes on the touch display, causing full-screen "cards" (e.g., watch faces or widgets) to scroll into view with a brief, momentum-based continuation before automatically aligning the new card with the display edges, creating an intuitive browsing experience ('922 Patent, abstract; Compl. ¶¶26; 70).
• Asserted Claims: At least Claim 9 Compl. ¶67
• Accused Features: The function in Xiaomi smartwatches where a user swipes horizontally on the touchscreen to scroll through and select different watch faces Compl. ¶¶68-71

U.S. Patent No. 9,873,018 - "Integrated Portable Device and Method Implementing an Accelerometer for Analyzing Biomechanical Parameters of a Stride"

• Technology Synopsis: The patent addresses the difficulty in obtaining accurate biomechanical data for runners outside of a lab setting '018 Patent, col. 1:40-49 The invention is a portable device, worn near the user's center of gravity, that uses a tri-axial accelerometer, GPS, and a chronograph to measure and calculate detailed stride parameters, such as vertical oscillation, anteroposterior direction, and cadence ('018 Patent, abstract; Compl. ¶¶28; 82-89).
• Asserted Claims: At least Claim 1 Compl. ¶81
• Accused Features: The fitness tracking functions in products like the Xiaomi Smart Band 7 Pro, which use a built-in accelerometer to measure biomechanical parameters such as running cadence (Compl. ¶¶82; 85).

U.S. Patent No. 9,536,134 - "Athletic Performance Monitoring Device"

• Technology Synopsis: The patent addresses power consumption in athletic monitoring systems '134 Patent, col. 2:10-14 It describes a system comprising a body-worn accelerometer (near the center of gravity) that acts as a "slave" and a separate user-worn processing device (e.g., a watch) that acts as a "master." The master device requests acceleration data from the slave accelerometer only when a predefined event occurs (e.g., a change in slope is detected), thereby conserving power while still providing relevant performance feedback ('134 Patent, abstract; Compl. ¶¶29; 102).
• Asserted Claims: At least Claim 14 Compl. ¶99
• Accused Features: The system architecture where a Xiaomi smart band tracks activity and wirelessly syncs data to the MI Fitness app on a smartphone, which acts as the processing system that requests and analyzes the data post-activity Compl. ¶¶100-103

III. The Accused Instrumentality

Product Identification

The complaint identifies a wide range of Xiaomi-branded smartwatches and fitness bands as the "Accused Products," with specific models cited as exemplary for different patents. These include the Xiaomi Smart Band 8, Redmi Watch 5 Active, Xiaomi Watch S4, and Xiaomi Smart Band 7 Pro Compl. ¶26

Functionality and Market Context

The Accused Products are described as smartwatches and wearables with digital displays and fitness tracking capabilities Compl. ¶7 The complaint focuses on several key functionalities:

• Power Management: The devices use accelerometers and/or touch panels to wake the display from a sleep state, for example, when a user taps the screen or performs a "raise-to-wake" wrist gesture (Compl. ¶¶36; 52).
• User Interface: The devices feature touch-sensitive displays that allow users to navigate menus and change watch faces by swiping on the screen Compl. ¶69
• Fitness Tracking: The devices incorporate accelerometers, GPS, and processors to measure, analyze, and display biomechanical data related to athletic activities like running, such as cadence Compl. ¶¶82-85
• Data Syncing: The wearables wirelessly communicate with a companion application (the MI Fitness app) on a smartphone, where activity data is transferred and processed to provide the user with performance information (Compl. ¶100; Compl. ¶101; Compl. ¶102; Compl. ¶103).
• The complaint alleges these products are sold in the United States through major distribution channels, including Best Buy, Walmart, and Amazon (Compl. ¶¶6; 12).

No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

'678 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
A method combining gesture detection by an inertial sensor and gesture detection with a touch panel for switching a wristwatch from a first power mode to a second power mode...	The Xiaomi Smart Band 8 is alleged to perform a method combining gesture detection from an inertial sensor with gesture detection from a touch panel to switch power modes.	¶36	col. 2:35-42
using the accelerometer of the inertial sensor for generating an acceleration signal... while the microcontroller and the touch controller are in a sleep power mode;	The accused product allegedly uses its accelerometer to generate a signal to detect a gesture, such as a wrist rotation, to transition from a sleep mode (e.g., screen off) to an active mode.	¶37	col. 7:40-45
using the processor and/or other processing means of the inertial sensor for discriminating between gesture and no gesture based on a direction of said acceleration signal and on a slope or frequency of said acceleration signal...	The accused product's processor allegedly works with the inertial sensor to discriminate between an intentional gesture (e.g., tap or turn) and no gesture based on the direction of the acceleration signal.	¶38	col. 6:46-59
in response to a detection of a gesture by said inertial sensor, waking up the touch controller;	The accelerometer in the accused product allegedly detects a gesture to wake up the touch controller display.	¶38	col. 7:1-8
using the touch controller for detecting a tap gesture on the cover glass with the touch panel;	The accused product's touch controller is alleged to detect a user's tap gesture on the touchscreen.	¶39	col. 7:56-59
waking up the microcontroller in said wristwatch upon detection of a tap gesture by said touch controller,	Upon the touch controller's detection of a tap, the microcontroller in the accused product allegedly wakes up from a lower power state.	¶40	col. 7:64-8:2
using said microcontroller for detecting said gesture and for discriminating between gesture and no gesture based at least on signals from the touch panel.	The accused product's microcontroller allegedly detects gestures and determines if a gesture occurred based at least in part on signals from the touch panel.	¶41	col. 8:27-45

• Identified Points of Contention:
  • Scope Question: A potential issue may be whether the accused product's processor architecture matches the claim language "processor... of the inertial sensor" '678 Patent, claim 1 The defense may argue that the discriminating function is performed by a general-purpose CPU rather than a processor integrated with or dedicated to the inertial sensor, raising a question of claim scope.
  • Technical Question: The claim recites a specific sequence of events (inertial sensor wakes touch controller, which then wakes microcontroller). An evidentiary question is whether the accused product's architecture follows this precise sequence or uses a more integrated system where these components are woken up simultaneously or in a different order, which could suggest a technical mismatch with the claimed method.

'085 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
detecting that an orientation of the wristwatch is in a starting position, wherein said step of detecting that the orientation is in the starting position comprises detecting that the orientation of the wristwatch is held within a first range for a defined time;	The accused product allegedly detects when it is in a starting orientation (e.g., arm down at the user's side) for a period of time before a gesture begins.	¶55	col. 9:60-10:2
detecting that an orientation of the wristwatch is then in a final position, wherein said step of detecting that the orientation is in the final position comprises detecting that the orientation is in a second range different from said first range,	The product's accelerometer allegedly detects a change in orientation from the first position to a final position (e.g., wrist raised to view the face), which corresponds to a different angular range.	¶56	col. 10:3-11
in response to a detection that the orientation of the wristwatch is in the second range, detecting that the wristwatch remains substantially immobile during a predetermined duration...	The accused product allegedly detects that once it is in the final viewing position, it remains substantially immobile for a period of time.	¶57	col. 10:25-32
...and that a duration between the starting position and the final position is in a predefined range.	The accused product allegedly detects that the time elapsed during the movement from the starting position to the final position falls within a predetermined time range.	¶57	col. 10:19-21

• Identified Points of Contention:
  • Scope Question: The claim requires detecting that the watch "remains substantially immobile." The construction of "substantially immobile" will be critical. The analysis will question what level of motion is permissible and how the accused device's sensitivity and thresholds for this detection align with the scope of this term as defined by the patent.
  • Technical Question: The claim recites a multi-part logical test (start position check, end position check, immobility check, and duration check). A central technical question is whether the accused "raise-to-wake" feature performs these discrete logical checks in sequence, or if it uses a more holistic gesture recognition algorithm (e.g., a machine-learning model) that achieves the same outcome without explicitly and separately performing each claimed step.

V. Key Claim Terms for Construction

For the '678 Patent

• The Term: "discriminating between gesture and no gesture based on a... slope or frequency of said acceleration signal" (Claim 1).
• Context and Importance: This term is central to the patent's proposed technical solution for improving wake-up reliability. The infringement analysis will likely turn on whether the signal processing performed by the accused products qualifies as "discriminating" based on the specific signal characteristics of "slope or frequency," as understood in the context of the patent. Practitioners may focus on this term because it defines the core novelty of the filtering method.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification describes using frequency and/or slope as a "signature" of a tap, distinguishing it from other movements '678 Patent, col. 2:62-3:3 This language could support an interpretation that covers any algorithm that uses these physical properties as a basis for classification.
  • Evidence for a Narrower Interpretation: The specification provides a specific formula for calculating slope '678 Patent, col. 7:13-19 and discusses frequency in the context of a pulse duration within a "predefined range" '678 Patent, col. 6:52-59 A party could argue that the claim is limited to these more specific, threshold-based calculations rather than any generic use of frequency or slope characteristics in a complex algorithm.

For the '085 Patent

• The Term: "detecting a wristturn" (Claim 1).
• Context and Importance: The entire method of Claim 1 is predicated on the detection of a "wristturn." The claim itself proceeds to define what "detecting a wristturn comprises" through a series of sub-steps. The dispute will likely focus on whether the holistic gesture performed by a user of an accused product and recognized by the device constitutes the specific, multi-part "wristturn" defined by the claim's limitations.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification refers to the method as being for "detecting rotation of the wrist" '085 Patent, col. 9:40-41, which suggests a potentially broad ordinary meaning. The term "wristturn" itself is not explicitly defined with a lexicographical definition.
  • Evidence for a Narrower Interpretation: The body of Claim 1 explicitly states that the step of "detecting a wristturn comprises" the subsequent list of four distinct orientation, immobility, and duration checks. This structure strongly suggests that the term "wristturn" is defined and limited by the specific sequence of detection events recited within the claim itself, rather than having a broader, independent meaning.

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement across all asserted patents. The basis for this allegation is that Defendants provide instructional materials, user manuals, and website advertising that allegedly instruct and encourage end-users to operate the accused products in a manner that directly infringes the claimed methods (e.g., by using raise-to-wake, swiping to change watch faces, and using fitness tracking features) (Compl. ¶¶31; 45; 61; 75; 93; 107).
• Willful Infringement: The complaint alleges willful infringement based on pre-suit knowledge. It asserts that Defendants were aware of the patents-in-suit because of Plaintiff's widely publicized infringement lawsuits against other major smartwatch manufacturers (Samsung, Apple, Garmin, etc.). The complaint cites industry publications covering these lawsuits as evidence of knowledge and further alleges that Defendants maintained a policy of willful blindness by not reviewing the patents of others (Compl. ¶44; Compl. ¶45).

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

1. A question of operational logic: A central evidentiary issue will be whether the accused Xiaomi products perform the specific, multi-step detection sequences recited in the patents. For instance, does the wake-up function follow the discrete inertial sensor → touch controller → microcontroller sequence of the '678 Patent, or does it use a technically distinct, integrated method to achieve a similar result?
2. A question of definitional scope: The case will likely involve significant claim construction disputes over functional terms. A core issue will be one of definitional scope: can the multi-part test for detecting a "wristturn" in the '085 Patent be construed to cover a generic "raise-to-wake" feature, and does the method of "discriminating" based on signal "frequency" or "slope" in the '678 Patent encompass the signal processing algorithms used in modern wearables?
3. A question of pre-suit knowledge: A key factual dispute will center on willfulness. The court will need to determine whether the plaintiff's theory-that a company gains knowledge of specific patents by monitoring industry news about competitor litigation, absent direct notice-is sufficient to meet the standard for establishing the knowledge and intent required for willful infringement.