Samsung Electronics Co Ltd v. CM HK Ltd

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Samsung Electronics Co., Ltd. (Korea); Samsung Electronics America, Inc. (New York)
  • Defendant: CM HK, Ltd. (Hong Kong S.A.R., China)
  • Plaintiff's Counsel: Paul Hastings LLP
• Case Identification: 4:24-cv-06567, N.D. Cal., 04/16/2026
• Venue Allegations: Plaintiff Samsung alleges venue is proper in the Northern District of California because Defendant CM HK is subject to personal jurisdiction in the district as a foreign entity. The jurisdictional allegations are based on CM HK's patent enforcement communications directed to Samsung's counsel in California, as well as CM HK's alleged status as an alter ego and joint venturer of other entities (the "CyWee Group") that have conducted litigation-related activities in the district.
• Core Dispute: Plaintiff seeks a declaratory judgment that its mobile devices do not infringe four U.S. patents owned by Defendant related to motion recognition technology using sensor fusion.
• Technical Context: The technology involves using data from multiple sensors (e.g., accelerometers, gyroscopes) in a handheld device to accurately recognize complex user motions and gestures in three-dimensional space, independent of the device's orientation.
• Key Procedural History: The complaint details a history of litigation between Samsung and entities related to the Defendant (CyWee Group) over a different set of patents, which were ultimately invalidated in inter partes review (IPR) proceedings. The current action arises from Defendant's subsequent threats to sue Samsung on the patents-in-suit, which allegedly issued after the IPRs and which Defendant claims Samsung's mobile devices infringe. A significant portion of the complaint is dedicated to establishing personal jurisdiction over the foreign defendant by alleging that it is an alter ego of the CyWee Group entities involved in the prior litigation.

Case Timeline

Date	Event
2009-07-14	Priority Date for '038 Patent, '072 Patent
2010-01-06	Priority Date for '846 Patent, '687 Patent
2017-02-01	CyWee Group files EDTX Suit against Samsung (approx. date) Compl. ¶25
2018-06-01	Google files IPR petitions against related patents (approx. date) Compl. ¶26
2019-04-30	'038 Patent Issued
2020-10-27	'072 Patent Issued
2020-12-01	'846 Patent Issued
2023-07-11	'687 Patent Issued
2024-04-04	CyWee Group contacts Samsung following IPR affirmance Compl. ¶27
2024-05-20	Defendant's counsel claims CM HK owns patents Compl. ¶32
2024-08-14	CyWee EDTX Suit dismissed Compl. ¶43
2024-09-05	Defendant's counsel makes damages demand over $500 million Compl. ¶46
2026-04-16	Complaint Filing Date Compl. p. 1

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

U.S. Patent No. 10,817,072 - Method and Apparatus for Performing Motion Recognition Using Motion Sensor Fusion, and Associated Computer Program Product

• Patent Identification: U.S. Patent No. 10,817,072, "Method and Apparatus for Performing Motion Recognition Using Motion Sensor Fusion, and Associated Computer Program Product," issued October 27, 2020.

The Invention Explained

• Problem Addressed: The patent's background describes the unreliability of motion recognition systems that use only a single type of sensor, such as an accelerometer or a gyroscope '072 Patent, col. 1:55 - col. 2:18 It notes that an accelerometer alone cannot distinguish linear acceleration from gravity, and a gyroscope alone cannot sense translational motion, leading to identification failures '072 Patent, col. 2:1-18
• The Patented Solution: The invention proposes a "sensor fusion" method that combines data from multiple sensors (e.g., accelerometer, gyroscope) to create a more accurate picture of the device's movement '072 Patent, abstract A key aspect of the solution is converting sensor data from the device's own coordinate system into a stable "global coordinate system" relative to the user '072 Patent, col. 2:32-48 This allows the system to recognize complex user motions, such as writing characters in 3D space, regardless of how the device is held or oriented '072 Patent, col. 7:32-35 The process is illustrated in the flowchart of FIG. 8 '072 Patent, FIG. 8
• Technical Importance: This technology was intended to enable more sophisticated and reliable gesture-based user interfaces on portable electronics, moving beyond simple screen taps to complex 3D motion controls '072 Patent, col. 7:1-24

Key Claims at a Glance

• The complaint asserts non-infringement of independent claims 1 and 10 Compl. ¶142
• Essential elements of independent claim 1 include:
  • obtaining sensor data from a plurality of motion sensors measured with respect to a device coordinate system;
  • performing sensor fusion to obtain motion data and an orientation based on a global coordinate system;
  • selecting a predetermined plane based on the orientation;
  • mapping the motion data onto the selected plane to obtain a trajectory; and
  • performing motion recognition based on the trajectory to recognize the user's motion in 3D space and at least one character drawn by the user.
• The complaint does not explicitly reserve the right to assert non-infringement of dependent claims.

U.S. Patent No. 10,275,038 - Method and Apparatus for Performing Motion Recognition Using Motion Sensor Fusion, and Associated Computer Program Product

• Patent Identification: U.S. Patent No. 10,275,038, "Method and Apparatus for Performing Motion Recognition Using Motion Sensor Fusion, and Associated Computer Program Product," issued April 30, 2019.

The Invention Explained

• Problem Addressed: The patent addresses the same problem as its family member, the '072 Patent: conventional motion recognition using single-sensor systems is prone to error because it cannot decouple different types of motion or account for the device's orientation '038 Patent, col. 1:55 - col. 2:18
• The Patented Solution: The patented method also uses sensor fusion to combine data from multiple inertial sensors '038 Patent, abstract The core of the solution is the conversion of sensor data from a device-fixed coordinate system to a user-fixed global coordinate system '038 Patent, col. 2:40-48 This conversion enables the system to reliably recognize user motions, including hand-writing in 3D space, by analyzing the motion within a consistent frame of reference '038 Patent, FIG. 11 '038 Patent, col. 8:12-19
• Technical Importance: The invention aimed to provide a robust framework for gesture-based control on handheld devices, making user interaction more intuitive and powerful by allowing for complex 3D inputs.

Key Claims at a Glance

• The complaint asserts non-infringement of independent claims 1 and 13 Compl. ¶148
• Essential elements of independent claim 1 are substantively identical to claim 1 of the '072 patent, including steps for:
  • obtaining sensor data from multiple motion sensors;
  • performing sensor fusion to derive motion data and orientation in a global coordinate system;
  • selecting a predetermined plane based on the orientation;
  • mapping the motion data onto the plane to get a trajectory; and
  • performing motion recognition on the trajectory to recognize a character drawn by the user in 3D space.
• The complaint does not explicitly reserve the right to assert non-infringement of dependent claims.

U.S. Patent No. 10,852,846 - Electronic Device for Use in Motion Detection and Method for Obtaining Resultant Deviation Thereof (Multi-Patent Capsule)

• Patent Identification: U.S. Patent No. 10,852,846, "Electronic Device for Use in Motion Detection and Method for Obtaining Resultant Deviation Thereof," issued December 1, 2020.
• Technology Synopsis: This patent describes a method to accurately calculate a device's deviation (yaw, pitch, and roll) using a nine-axis motion sensor module that includes a rotation sensor, accelerometer, and magnetometer '846 Patent, abstract The invention uses a "comparison and compensation" process to correct for interferences, such as external electromagnetic fields or unintended axial accelerations, to obtain a more reliable, "absolute" orientation output '846 Patent, abstract '846 Patent, col. 4:55-67
• Asserted Claims: Claims 1 and 7 Compl. ¶154
• Accused Features: Plaintiff denies that its devices infringe by "obtaining a quaternion by predicting axial accelerations; comparing predicted axial accelerations with measured axial accelerations; and using predicted axial accelerations converted from measured angular velocities" Compl. ¶153

U.S. Patent No. 11,698,687 - Electronic Device for Use in Motion Detection and Method for Obtaining Resultant Deviation Thereof (Multi-Patent Capsule)

• Patent Identification: U.S. Patent No. 11,698,687, "Electronic Device for Use in Motion Detection and Method for Obtaining Resultant Deviation Thereof," issued July 11, 2023.
• Technology Synopsis: Belonging to the same family as the '846 Patent, this invention details a specific algorithm for calculating a device's orientation '687 Patent, abstract The method involves using a "previous quaternion" and measured angular velocities to calculate a "current quaternion," which is then used to generate "predicted axial accelerations." These predictions are compared with measured accelerations to produce an "updated quaternion" representing the device's true orientation '687 Patent, abstract '687 Patent, claim 1
• Asserted Claims: Claims 1, 14, and 27 Compl. ¶160
• Accused Features: Plaintiff's non-infringement allegations are the same as for the '846 Patent, focusing on the denial of specific algorithmic steps involving the prediction and comparison of axial accelerations Compl. ¶159

III. The Accused Instrumentality

• Product Identification: The accused instrumentalities are "Samsung's mobile devices," specifically those "having sensors for detecting motion and movement" Compl. ¶2 Compl. ¶23
• Functionality and Market Context: The complaint alleges that Samsung's mobile devices include sensors capable of determining position and movement, which are used for various user functionalities Compl. ¶133 While acknowledging that the devices may "calculate trajectories or perform character recognition," the complaint asserts they do so using methods different from those claimed in the patents-in-suit Compl. ¶141 Compl. ¶147 The Defendant's alleged damages demand of over $500 million for sales of Samsung's phones in the U.S. suggests the high commercial significance of the accused products Compl. ¶46

No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint seeks a declaratory judgment of non-infringement and therefore frames its allegations as denials of infringement.

'072 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality (as denied by Plaintiff)	Complaint Citation	Patent Citation
mapping the motion data onto the selected one of the at least one predetermined plane to obtain a trajectory on the selected one of the at least one predetermined plane;	The accused Samsung mobile devices do not practice mapping resultant angles onto a plane that is selected based on an orientation derived from sensor fusion to obtain a trajectory.	¶141	col. 7:36-40
and performing motion recognition based on the trajectory on the selected one of the at least one predetermined plane at the global coordinate system in order to recognize the user's motion in 3D space and at least one character drawn by the user in the 3D space,	The accused devices do not practice recognizing user motion in three-dimensional space for character recognition. To the extent they perform this function, it is done without angle mapping using sensor fusion data.	¶141	col. 7:41-49

'038 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality (as denied by Plaintiff)	Complaint Citation	Patent Citation
performing motion recognition based on the trajectory on the selected one of the at least one predetermined plane at the global coordinate system in order to recognize the user's motion in 3D space and at least one character drawn by the user in the 3D space,	The accused Samsung mobile devices do not practice recognizing user motion in three-dimensional space for character recognition. To the extent such recognition is performed, it is done in two-dimensional space.	¶147	col. 7:41-49

• Identified Points of Contention:
  • Scope Questions: For both the '072 and '038 patents, the central dispute concerns the scope of recognizing motion "in 3D space." Samsung alleges its devices perform character recognition in "two-dimensional space" Compl. ¶147 This raises the question of whether the patents' method of mapping 3D motion onto a 2D plane for analysis means the "recognition" step itself is fundamentally a 2D process, which could support Samsung's non-infringement theory.
  • Technical Questions: A key technical question is how Samsung's devices actually perform trajectory calculation or character recognition. The complaint provides no technical details, only denials. The court will need to examine the source code or technical specifications of Samsung's sensor fusion algorithms to determine if they practice the claimed mapping and recognition steps.

V. Key Claim Terms for Construction

• The Term: "recognize the user's motion in 3D space" (from claim 1 of the '072 and '038 patents)

  • Context and Importance: This term is at the core of the dispute for the '072 and '038 patents. Plaintiff's primary non-infringement argument is that its devices perform recognition in "two-dimensional space," not "3D space" Compl. ¶147 The construction of this term will likely determine whether the accused functionality falls within the claim scope.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification repeatedly refers to the overall goal of recognizing motion "in the 3D space" '038 Patent, col. 7:46-47 and provides examples of a user physically drawing characters in the air '038 Patent, FIG. 33 This context may support an interpretation where any recognition originating from a three-dimensional physical movement is considered recognition "in 3D space."
    • Evidence for a Narrower Interpretation: The claims explicitly require "mapping the motion data onto... a predetermined plane to obtain a trajectory" and then performing recognition "based on the trajectory" '038 Patent, claim 1 This two-step process, which projects 3D data onto a 2D plane before recognition, could support a narrower construction where the "recognition" itself is a 2D pattern-matching operation, aligning with Plaintiff's assertion Compl. ¶147 The specification further notes the processor can "extract the 2D points from the 3D points" to be "utilized for performing motion recognition" '038 Patent, col. 20:30-33

• The Term: "predicting axial accelerations" (relevant to '846 and '687 patents)

  • Context and Importance: Plaintiff's non-infringement defense for the '846 and '687 patents hinges on this term, as it denies its devices perform this specific step Compl. ¶153 Compl. ¶159 The construction of "predicting" will be critical to determine if Samsung's sensor fusion algorithm infringes.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification teaches calculating "predicted axial accelerations" based on the "current state" of the device, which is derived from measured angular velocities '846 Patent, FIG. 7, step 730 '846 Patent, col. 17:11-20 This could support a broad interpretation where any algorithm that uses gyroscope data to estimate or model expected accelerometer readings would be considered "predicting."
    • Evidence for a Narrower Interpretation: The patent provides specific equations for calculating "predicted axial accelerations" from a quaternion representing the device's orientation '846 Patent, col. 17:21-27, eq. 2-4 A party could argue that "predicting" should be narrowly construed to mean using this specific mathematical model, and that any different sensor fusion algorithm, even if it uses both sensor types, does not meet this limitation.

VI. Other Allegations

• Indirect Infringement: The complaint is for declaratory judgment of non-infringement and expressly denies any indirect infringement. It states, "Samsung has not caused, directed, requested, or facilitated any such infringement, and never had any specific intent to do so" Compl. ¶137
• Willful Infringement: The complaint does not allege facts to support a claim of willful infringement against Samsung. It describes pre-suit communications and threats of litigation from the Defendant, which establish a basis for the declaratory judgment action Compl. ¶¶27-49

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

• Jurisdictional Reach: A significant threshold issue, unrelated to the patent merits, will be whether the court has personal jurisdiction over the foreign defendant, CM HK. The resolution will depend on the court's evaluation of the extensive alter ego and joint venture allegations connecting CM HK to entities with established contacts in the forum Compl. ¶¶53-129
• Definitional Scope: A core patent law question will be one of claim construction: can the term "recognize... in 3D space" (asserted in the '072 and '038 patents) be interpreted to read on a system that, according to Plaintiff, performs recognition in "two-dimensional space" after mapping the initial 3D motion onto a 2D plane?
• Algorithmic Equivalence: A central evidentiary question for the '846 and '687 patents will be functional and technical. Does Samsung's sensor fusion algorithm perform the specific, claimed steps of "predicting axial accelerations" and comparing them to measured data, or does it employ a fundamentally different, non-infringing method for combining sensor inputs?