DCT

2:26-cv-00760

Fingertip Mouse Corp v. Samsung Electronics America Inc

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Complaint
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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 2:26-cv-00760, E.D. Tex., 08/26/2026
  • Venue Allegations: Plaintiff alleges venue is proper in the Eastern District of Texas because Defendant has allegedly committed acts of infringement and maintains a regular and established place of business within the district.
  • Core Dispute: Plaintiff alleges that Defendant's Samsung Galaxy Ring infringes three U.S. patents related to wearable, finger-mounted computer pointing devices.
  • Technical Context: The technology at issue falls within the human-computer interface (HCI) and wearable electronics market, concerning devices that offer an alternative to traditional computer mice.
  • Key Procedural History: The patents-in-suit share a common priority date and belong to the same patent family. The patent documents indicate the patents are subject to terminal disclaimers, which may be relevant to their enforceability if they are found to be patentably indistinct. The complaint does not mention any prior litigation or administrative proceedings involving these patents.

Case Timeline

Date Event
2004-11-05 Priority date for '075, '983, and '070 patents
2015-07-28 U.S. Patent No. 9,092,075 issues
2016-02-16 U.S. Patent No. 9,261,983 issues
2021-03-30 U.S. Patent No. 10,963,070 issues
2026-08-26 Complaint filed

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

U.S. Patent No. 9,092,075 - "Fingertip Mouse and Base"

  • Patent Identification: U.S. Patent No. 9,092,075 ("the '075 Patent"), "Fingertip Mouse and Base," issued on July 28, 2015 Compl. ¶¶6-7

The Invention Explained

  • Problem Addressed: The patent's background section notes that conventional computer mice are typically sized to a human hand and are moved across a surface, which can be cumbersome ʼ075 Patent, col. 1:24-30
  • The Patented Solution: The invention is a computer peripheral system comprising a small, portable "tracking device" designed to be worn on a user's finger and a "base device" that can receive it ʼ075 Patent, abstract The finger-worn device itself can track movement to control a cursor, and when docked in the base, the combined unit can function like a traditional mouse, offering a dual-mode, flexible input system ʼ075 Patent, col. 3:3-9 ʼ075 Patent, col. 3:41-52
  • Technical Importance: This approach provided a portable and potentially more ergonomic alternative for computer cursor control, merging the concepts of wearable technology and familiar desktop peripherals ʼ075 Patent, col. 2:1-4

Key Claims at a Glance

  • The complaint asserts infringement of at least independent claim 1 Compl. ¶13
  • The essential elements of Claim 1 include:
    • A wireless finger-worn motion tracking device with a housing having a "passage therethrough" for a user's finger.
    • The housing contains "all electronics for operating the wireless finger-worn motion tracking device" within an inner space.
    • Wireless communication components to communicate with a separate computing system.
    • A "motion tracking mechanism" comprising an accelerometer to generate movement information for controlling the computing system.
    • A "selection mechanism" (e.g., a button).
    • A "display device" located on the housing.
      ʼ075 Patent, col. 11:11-48 ʼ075 Patent, col. 12:1-5
  • The complaint does not explicitly reserve the right to assert dependent claims.

U.S. Patent No. 9,261,983 - "Fingertip Mouse and Base"

  • Patent Identification: U.S. Patent No. 9,261,983 ("the '983 Patent"), "Fingertip Mouse and Base," issued on February 16, 2016 Compl. ¶¶8-9

The Invention Explained

  • Problem Addressed: Similar to the '075 Patent, this patent addresses the form factor and operational constraints of traditional hand-operated computer mice ʼ983 Patent, col. 1:21-27
  • The Patented Solution: As a continuation in the same family, this patent also describes a self-contained, finger-worn apparatus. The claims focus on the device's structure, including a housing that allows the user's fingertip to extend beyond it, an inner space containing all electronics, wireless components, a display, and an accelerometer-based motion tracking mechanism. The design facilitates use as a wearable pointer while leaving the fingertip exposed ʼ983 Patent, abstract ʼ983 Patent, col. 11:11-42
  • Technical Importance: The invention refines the concept of a fully integrated wearable pointing device, emphasizing a form factor that allows for simultaneous device control and other tasks requiring an exposed fingertip, like typing ʼ983 Patent, col. 10:28-34

Key Claims at a Glance

  • The complaint asserts infringement of at least independent claim 1 Compl. ¶18
  • The essential elements of Claim 1 include:
    • An apparatus with a housing configured for a "finger-worn position" where the "tip end portion of the user's finger extends beyond the housing."
    • An inner space within the housing that "contains all electronics for operating the apparatus as a wireless finger-worn motion tracking device."
    • Wireless communication components for communicating with a separate computing system.
    • A "display device" on the housing.
    • A "motion tracking mechanism" with an accelerometer to generate movement information based on the housing's movement.
      ʼ983 Patent, col. 11:11-42
  • The complaint does not explicitly reserve the right to assert dependent claims.

U.S. Patent No. 10,963,070 - "Fingertip Mouse and Base"

  • Patent Identification: U.S. Patent No. 10,963,070 ("the '070 Patent"), "Fingertip Mouse and Base," issued on March 30, 2021 Compl. ¶¶10-11
  • Technology Synopsis: This patent also addresses the limitations of conventional mice by describing a finger-worn motion detecting device ʼ070 Patent, col. 1:21-29 The invention is a self-contained wireless apparatus worn on a finger, with all electronics, including a motion detecting mechanism, wireless components, and a display, housed within it ʼ070 Patent, abstract '070 Patent, claim 1
  • Asserted Claims: The complaint asserts infringement of at least independent claim 1 Compl. ¶23
  • Accused Features: The complaint alleges that the Samsung Galaxy Ring, by being a finger-worn device with the specified functionalities, infringes the '070 Patent Compl. ¶23

III. The Accused Instrumentality

Product Identification

  • The complaint identifies the "Samsung Galaxy Ring" as the accused instrumentality Compl. ¶13 Compl. ¶18 Compl. ¶23

Functionality and Market Context

  • The complaint alleges that the Samsung Galaxy Ring is made, used, sold, or imported by the Defendant and infringes the patents-in-suit (Compl. ¶13; Compl. ¶14). The complaint does not provide specific details regarding the technical functionality or market positioning of the accused product, instead incorporating by reference preliminary claim charts in Exhibits D, E, and F, which were not provided for this analysis.

No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint references preliminary claim charts (Exhibits D and E) to detail the infringement allegations for the '075 and '983 patents, respectively Compl. ¶13 Compl. ¶18 As these exhibits were not provided, a claim chart summary cannot be constructed. The infringement theory is based on allegations that the Samsung Galaxy Ring directly infringes, either literally or under the doctrine of equivalents, by embodying the elements of the asserted claims Compl. ¶13 Compl. ¶18

Identified Points of Contention

  • Structural Questions: A primary point of contention may arise from the specific structural limitations in the claims. For the '075 Patent, a key question is whether the accused ring, presumably a closed-loop device, can be considered to have a "passage therethrough" in the manner claimed ʼ075 Patent, col. 11:15-16 For the '983 Patent, a similar question exists regarding whether the ring's design allows a "tip end portion of the user's finger [to] extend... beyond the housing" ʼ983 Patent, col. 11:15-17 The defense may argue that a modern smart ring has a fundamentally different physical structure than the thimble-like embodiments described in the patents.
  • Functional Questions: The patents describe a device whose purpose is to function as a "motion tracking device" for "controlling the separate computing system," with a strong contextual link to cursor control ʼ075 Patent, col. 11:41-45 ʼ983 Patent, col. 11:36-40 A central question for the court will be whether the motion-sensing features of a multi-purpose smart ring, which may be used for notifications, fitness tracking, or general gesture control, perform the specific function of a "fingertip mouse" as contemplated by the patents.

V. Key Claim Terms for Construction

The Term: "motion tracking mechanism" / "motion detecting mechanism"

Context and Importance

This term is the functional core of the invention. Its construction will determine whether the motion-sensing capabilities of the accused product fall within the scope of the claims. The claims require this mechanism to include an accelerometer and to "generate movement information... for use in controlling the separate computing system" ('075 Patent, col. 11:41-45). Practitioners may focus on whether this requires functionality equivalent to a computer mouse (i.e., cursor control) or if it more broadly covers any motion-based input.

Intrinsic Evidence for Interpretation

  • Evidence for a Broader Interpretation: Plaintiff may argue that the specification's disclosure of using the device to "manipulate objects in a video game" supports a broader interpretation beyond simple cursor movement '075 Patent, col. 11:1-10 The general language "controlling the separate computing system" could be argued to cover a wide range of motion-based inputs.
  • Evidence for a Narrower Interpretation: Defendant may argue that the patent's title ("Fingertip Mouse and Base"), background discussion of computer mice, and repeated references to controlling a "cursor" limit the term to devices that function as a mouse replacement '075 Patent, title '075 Patent, col. 1:21-30 '075 Patent, col. 3:10-12

The Term: "housing" (and its configuration)

Context and Importance

The definition and scope of the "housing" are critical for the structural infringement analysis. The claims of the '075 and '983 patents recite specific configurations, such as having a "passage therethrough" or allowing a fingertip to "extend... beyond the housing." Whether the accused ring meets these structural limitations will be a central dispute.

Intrinsic Evidence for Interpretation

  • Evidence for a Broader Interpretation: Plaintiff could point to specification language mentioning that the device may be implemented using "various form factors" ('983 Patent, col. 5:58-59) and highlight figures that depict ring-like structures to argue for a more flexible interpretation of the housing's shape ('983 Patent, Fig. 4).
  • Evidence for a Narrower Interpretation: Defendant will likely focus on the plain language of the claims, arguing that a closed-loop ring does not have a "passage therethrough" from which a finger "extends beyond" it in the manner of a thimble, as depicted in some embodiments and described in the claims '075 Patent, cl. 1 '983 Patent, cl. 1 '983 Patent, Fig. 16

VI. Other Allegations

The complaint does not contain specific counts or factual allegations for indirect infringement or willful infringement. It requests attorneys' fees under 35 U.S.C. § 285, which is reserved for "exceptional cases," but does not plead the underlying facts for such a finding Compl. p. 6

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

The resolution of this case may depend on the court's determination of the following open questions:

  • A question of structural scope: Can the claims, which recite specific housing configurations like a "passage therethrough" or an opening for a fingertip to "extend beyond," be interpreted to cover the physical structure of a modern, closed-loop smart ring? The case may turn on whether the accused product is structurally equivalent to the claimed invention, which is rooted in thimble-like embodiments.
  • A question of functional purpose: Does the accused product's use of an accelerometer for general-purpose gesture control or other smart-ring functions constitute infringement of claims for a "motion tracking mechanism" intended for "controlling" a computer system in the context of a "fingertip mouse"? The court will need to decide if the claimed function is limited to precise cursor control or broadly covers any form of motion-based system command.