DCT

2:26-cv-00649

Hi Dow Iphc Inc v. Hong Qiangxing Shenzhen Electronics Ltd

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 2:26-cv-00649, E.D. Tex., 07/31/2026
  • Venue Allegations: Venue is alleged to be proper in any U.S. judicial district because the defendant is a foreign company not resident in the United States.
  • Core Dispute: Plaintiff alleges that Defendant's wireless muscle stimulator, manufactured for a U.S. brand, infringes a patent related to a system for wirelessly controlling multiple electrical stimulation units from a single remote.
  • Technical Context: The technology resides in the market for personal therapeutic devices, specifically transcutaneous electrical nerve stimulation (TENS) and electrical muscle stimulation (EMS) products used for pain relief and muscle recovery.
  • Key Procedural History: The asserted patent, U.S. Patent No. 9,415,217, was the subject of an ex parte reexamination that concluded with the issuance of a Reexamination Certificate on July 20, 2026. The reexamination amended independent claims 1 and 15. The Plaintiff contends these amendments did not substantively change the claim scope, which may be a central point of dispute regarding pre-certificate damages and intervening rights.

Case Timeline

Date Event
2014-07-10 '217 Patent Priority Date
2016-08-16 '217 Patent Issue Date
2024-06-27 FDA issues substantial-equivalence decision for Accused Product
2026-07-20 '217 Patent Reexamination Certificate Issued
2026-07-31 Complaint Filed

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

U.S. Patent No. 9,415,217 - "Wireless Electrical Stimulation System"

  • Patent Identification: U.S. Patent No. 9,415,217 ("Wireless Electrical Stimulation System"), issued August 16, 2016. Compl. ¶15

The Invention Explained

  • Problem Addressed: The patent's background section describes conventional electrical stimulation systems as inconvenient because they typically use a control unit hard-wired to electrodes, which restricts user movement, allows for only one treatment at a time, and provides limited feedback to the user. Compl. ¶14 '217 Patent, col. 1:21-29
  • The Patented Solution: The invention is a wireless system comprising a single remote transmitter that can independently control at least two separate electrical stimulation units. Compl. ¶14 '217 Patent, abstract The transmitter sends operating instructions-such as mode, intensity, and duration-to each stimulation unit on separate communication channels, allowing a user to customize therapy for different parts of the body simultaneously from one controller. '217 Patent, col. 1:35-44 '217 Patent, FIG. 26
  • Technical Importance: The patented solution aims to improve user convenience and therapeutic flexibility by removing wires and enabling simultaneous, independent control over multiple treatment areas. Compl. ¶14

Key Claims at a Glance

  • The complaint asserts direct and indirect infringement of at least claims 1-9, 11, and 13 of the '217 Patent. Compl. ¶34 Compl. ¶36 Claim 1 is the primary independent claim asserted.
  • The essential elements of independent Claim 1 (as amended by reexamination) include:
    • A wireless electrical stimulation system comprising at least two electrical stimulation units.
    • A transmitter for remotely and wirelessly controlling each unit by transmitting operating instructions on separate channels at different frequencies.
    • The system operates by matching a code sent by each stimulation unit with a predetermined code before sending operating instructions.
    • The transmitter includes a unit selector for allowing a user to select which stimulation unit to control.
  • The complaint explicitly asserts dependent claims 2-9, 11, and 13. Compl. ¶36

III. The Accused Instrumentality

Product Identification

  • The "Chirp Halo Double Wireless Muscle & Nerve Stimulator," including its two wireless stimulation units, handheld remote, and associated firmware. Compl. ¶5 Compl. ¶24

Functionality and Market Context

  • The Accused Product is a TENS/EMS system consisting of two wireless stimulation "Halo" units controlled by a single handheld remote. Compl. ¶30 Compl. ¶31 The complaint alleges the remote is used to pair with, select, and adjust the units, with the user manual providing instructions for "Controlling 2 Units Separately." Compl. ¶31
  • The complaint alleges, upon information and belief, that the remote and units communicate over separate channels at different frequencies and that the system pairs by "matching a code sent by the unit with a predetermined code." Compl. ¶32 Public FCC authorization materials for the product identify the Defendant as the manufacturer and note the system operates using 80 channels with 1 MHz separation in the 2.4 GHz band. Compl. ¶27
  • The complaint includes an image of the Accused Product's packaging, which depicts two wireless stimulation units and a single remote, consistent with the system architecture described. Compl. ¶25, FIG. 1
  • Defendant Hong Qiangxing is alleged to be the manufacturer of the Accused Product for the U.S. brand owner, Chirp. Compl. ¶2 Compl. ¶28 A photograph of the product label identifies the model number and an FCC ID that links to Defendant in public databases. Compl. ¶25, FIG. 2 Compl. ¶27

IV. Analysis of Infringement Allegations

The complaint references an exemplary claim chart in an exhibit that was not provided with the document. The following summary is based on the narrative allegations of infringement. Compl. ¶34

'217 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
A wireless electrical stimulation system comprising: at least two electrical stimulation units... The Accused Product is a system that "includes the two wireless stimulation units, handheld remote, electrode pads..." and other components. ¶24; ¶30 col. 3:46-47
a transmitter for remotely, wirelessly controlling each of the electrical stimulation units... The Accused Product "includes a single wireless handheld remote used to pair with, select, program, start, pause, and adjust the Halo stimulation units." ¶31 col. 1:39-44
...transmitting operating instructions... on separate channels at different communication frequencies... "[T]he remote and the two Halo units communicate on separate channels at different communication frequencies within the disclosed 2.4 GHz operating range." ¶32 col. 10:48-52
...matching a code sent by each of the electrical stimulation units with a predetermined code before sending the operating instructions... "[T]he system pairs or synchronizes each unit with the remote by matching a code sent by the unit with a predetermined code." ¶32 col. 10:48-52
...wherein the transmitter includes a unit selector configured to allow a user to select one of the at least two electrical stimulation units to control... "The remote includes a unit selector..." and the manual provides instructions for "Controlling 2 Units Separately." ¶31; ¶33 col. 1:50-53
  • Identified Points of Contention:
    • Scope Questions: The complaint argues that amendments made to Claim 1 during reexamination were clarifying and did not substantively narrow the claim's scope. Compl. ¶¶17-19 This raises the question of whether the Defendant can successfully argue that the amendments did narrow the scope, which could establish intervening rights and shield it from liability for infringement that occurred before the reexamination certificate was issued.
    • Technical Questions: The complaint alleges that the accused system's pairing process involves "matching a code sent by the unit with a predetermined code." Compl. ¶32 A key question is what evidence the Plaintiff will produce to show that the accused product's pairing protocol technically operates in the specific manner required by the claim language, as opposed to using another form of wireless handshake or authentication.

V. Key Claim Terms for Construction

  • The Term: "matching a code sent by each of the electrical stimulation units with a predetermined code"

  • Context and Importance: This term defines the specific handshake protocol for pairing the remote and stimulation units. Infringement will depend on whether the Accused Product's synchronization process meets this precise description. Practitioners may focus on this term because the specific directionality and sequence of the pairing process is a highly technical element that may not be satisfied by all wireless protocols.

  • Intrinsic Evidence for Interpretation:

    • Evidence for a Broader Interpretation: A plaintiff may argue that this language should be construed to cover any process where the transmitter confirms the identity of a specific stimulation unit before establishing a control link, as this fulfills the term's purpose within the claim.
    • Evidence for a Narrower Interpretation: The claim language recites a specific sequence: the stimulation unit sends a code, and the transmitter matches it. (Patent, col. 10:48-52) A defendant may argue this requires a literal one-way code transmission from the unit to the transmitter for verification, and that a different protocol (e.g., a two-way challenge-response, or the transmitter broadcasting a code) would not infringe.

  • The Term: "separate channels at different communication frequencies"

  • Context and Importance: This term is fundamental to the patent's value proposition of independent control over multiple units. The reexamination added the word "communication" to distinguish these from the "pulse frequencies" of the therapy itself. Compl. ¶17

  • Intrinsic Evidence for Interpretation:

    • Evidence for a Broader Interpretation: The specification generally describes communication via a radio frequency (RF) protocol. '217 Patent, col. 2:22-24 A plaintiff may argue the term broadly covers any RF scheme that uses distinct frequencies to avoid crosstalk between control signals for different units.
    • Evidence for a Narrower Interpretation: The patent describes the transmitter "chang[ing] the channel on which the transmitter 106 operates" to control different units. '217 Patent, col. 4:9-11 A defendant may argue this implies a system where a single-transceiver remote hops between frequencies to communicate sequentially, not a system capable of managing simultaneous communication on multiple channels, which may be how the accused product operates.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges inducement by asserting that the Defendant supplies the Accused Product with instructions, firmware, and user controls that cause end-users to operate the system in an infringing manner. Compl. ¶37 Contributory infringement is alleged on the basis that the system components are specially made for use in the infringing system and have no substantial non-infringing use. Compl. ¶38
  • Willful Infringement: Willfulness is alleged based on Defendant's continued infringement after receiving notice of the patent and allegations via the complaint, with the complaint reserving the right to prove pre-suit knowledge through discovery. Compl. ¶39

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

The resolution of this case may turn on the answers to two central questions:

  1. A central legal question will be the impact of reexamination: did the amendments to Claim 1, which added the terms "communication" and "control each of the electrical stimulation units to," substantively narrow the claim's scope? The court's finding on this issue will determine whether the Defendant may assert intervening rights, potentially shielding it from damages accrued before the reexamination certificate was issued.

  2. A key evidentiary question will be one of protocol matching: does the Accused Product's pairing mechanism technically perform the claimed step of the transmitter "matching a code sent by each of the electrical stimulation units with a predetermined code," or does discovery reveal a synchronization method that is technically and legally distinct from that specific claimed sequence?

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