2:23-cv-03220
Pearl Musical Instrument Co Co Ltd v. Hoshino Gakki Co Ltd
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: Pearl Musical Instrument Co. Ltd. (Japan)
- Defendant: Hoshino Gakki Co., Ltd. (Japan) and Hoshino (U.S.A.) Inc. (Pennsylvania)
- Plaintiff's Counsel: K&L Gates LLP; Bass, Berry & Sims PLC
- Case Identification: 2:23-cv-03220, E.D. Pa., 08/07/2026
- Venue Allegations: Venue is alleged to be proper in the Eastern District of Pennsylvania because Defendant Hoshino (U.S.A.) Inc. has its principal place of business in the district, Defendants have a regular and established place of business there, and they have allegedly committed acts of infringement within the district. The complaint also notes that Defendants have consented to venue by interposing patent counterclaims in the action.
- Core Dispute: Plaintiff alleges that Defendants' TAMA "Fieldstar" line of marching drum carriers infringes a patent related to body-supportable musical instrument carriers, and also infringes Plaintiff's trade dress rights in its own competing product line.
- Technical Context: The technology concerns ergonomic carriers that allow musicians, particularly in marching bands and drum corps, to carry and play heavy percussion instruments while moving.
- Key Procedural History: This Second Amended Complaint follows an ex parte reexamination of the patent-in-suit, which was initiated by Defendant Hoshino Japan. The U.S. Patent and Trademark Office (USPTO) proceeding concluded with the cancellation of two claims (21 and 22) and the confirmation of patentability for claims 1-20 and 23. This reexamination history may influence subsequent validity and infringement arguments.
Case Timeline
| Date | Event |
|---|---|
| 2008-12-24 | '261 Patent Priority Date |
| 2010-03-02 | '261 Patent Issue Date |
| 2012-08-07 | USPTO cites '261 Patent in rejection of a Hoshino patent application |
| 2022-02-15 | Hoshino files a patent application that discusses the '261 Patent |
| 2022-11-01 | Hoshino enters partnership to supply the Bluecoats drum and bugle corps |
| 2023-02-08 | Hoshino allegedly launches accused TAMA Fieldstar Carrier at TMEA Conference |
| 2023-04-10 | Plaintiff sends first written notice of infringement to Defendants |
| 2023-05-18 | Plaintiff sends second written notice of infringement to Defendants |
| 2023-07-05 | Accused carriers allegedly used by the Bluecoats at a DCI event |
| 2024-01-01 | Defendants allegedly begin sending pricing and accepting orders from dealers |
| 2024-02-20 | Defendant Hoshino Japan files ex parte reexamination request for '261 Patent |
| 2024-07-01 | Accused carriers allegedly begin arriving to individuals and bands |
| 2025-04-16 | USPTO issues Ex Parte Reexamination Certificate for '261 Patent |
| 2026-08-07 | Second Amended Complaint Filing Date |
II. Technology and Patent(s)-in-Suit Analysis
- Patent Identification: U.S. Patent No. 7,671,261, "Musical Instrument Carrier and Related Methods," issued March 2, 2010.
The Invention Explained
- Problem Addressed: The patent addresses the shortcomings of historical drum carriers for marching musicians, which the complaint describes as "heavy, uncomfortable metal contraptions that impede" performance due to a lack of structural reliability and comfort Compl. ¶23
- The Patented Solution: The invention is a body-supportable carrier designed to be lightweight, adjustable, and stable Compl. ¶24 It comprises a "rigid tubular frame" with a "substantially U-shaped" section that rests on the user's shoulders and extends across the back, and two end sections that run down the user's torso '261 Patent, abstract This frame connects to a "belly plate" via "first mounting members," and the belly plate in turn connects to the musical instrument via "second mounting members" '261 Patent, abstract '261 Patent, col. 2:1-5 This architecture aims to distribute the instrument's weight comfortably while holding it in a stable playing position '261 Patent, col. 1:21-26
- Technical Importance: The design represents an effort to improve ergonomics and performance for marching percussionists by creating a carrier that is lighter and more adjustable than prior designs Compl. ¶24
Key Claims at a Glance
- The complaint's infringement counts focus on at least Claim 1 Compl. ¶113
- The essential elements of independent Claim 1 are:
- A rigid tubular frame comprising a substantially U-shaped intermediate section (conforming to the user's shoulders and back) and first and second end sections (extending downward and parallel in front of the user's torso).
- A belly plate.
- First mounting members that are mountable on the belly plate and engageable with the frame's end sections to secure the two together.
- Second mounting members that are mountable on the belly plate and engageable with a musical instrument to secure it to the carrier.
- The complaint appears to reserve the right to assert other claims, as the prayer for relief seeks a finding of infringement of "one or more claims of the '261 Patent" Compl. Prayer B
III. The Accused Instrumentality
Product Identification
The accused products are the TAMA "Fieldstar" Carriers Compl. ¶40
Functionality and Market Context
The TAMA Fieldstar Carrier is a marching drum carrier designed for use with snare, tenor, and bass drums Compl. ¶60 It is marketed as being "lighter, more adjustable, and better accommodate athletic movement" Compl. ¶50 The complaint highlights that Defendants market an "All Access" version of the Fieldstar Carrier, which is promoted as being compatible with instruments from various manufacturers, including those made by Plaintiff Compl. ¶61 Plaintiff alleges that its own CX Series Carrier is the "best-selling" in the U.S. market and that Defendants' Fieldstar Carrier is a direct competitor Compl. ¶31 Compl. ¶39
IV. Analysis of Infringement Allegations
The complaint alleges that the TAMA Fieldstar Carriers infringe at least Claim 1 of the '261 Patent, either literally or under the doctrine of equivalents Compl. ¶54 The core of this allegation is illustrated with an annotated image showing the accused product. A screenshot from a video shows the accused carrier with colored arrows indicating components alleged to meet the claim limitations Compl. ¶55 Compl. p. 12 Another image provides a direct side-by-side comparison of the Plaintiff's and Defendant's products Compl. p. 31
'261 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| a rigid tubular frame comprising a substantially U-shaped intermediate section and first and second end sections at opposite ends... the substantially U-shaped intermediate section substantially conforming to shoulder and upper back regions... the first and second end sections extending downward substantially parallel to one another for resting in front of a front torso region... | The TAMA Fieldstar Carriers possess a "rigid tubular frame with a U-shaped intermediate section that engages a user's back" and "first and second end sections that extend downward substantially parallel to one another in front of a front torso region." | ¶55 | col. 4:1-4 |
| a belly plate; | The accused carriers possess a "belly plate." | ¶55 | col. 4:38-39 |
| first mounting members mountable on the belly plate and engageable with the first and second end sections... for securing the belly plate to the rigid tubular frame; | The accused carriers possess "mounting members mountable on the belly plate that secure the rigid tubular frame." | ¶55 | col. 5:4-10 |
| and second mounting members mountable on the belly plate and engageable with a musical instrument for securing the musical instrument to the body-supportable musical-instrument carrier. | The accused carriers possess "members mountable on the belly plate for securing the musical instrument to the carrier." | ¶55 | col. 5:58-62 |
Identified Points of Contention
- Scope Questions: Claim 1 uses the terms "substantially U-shaped" and "substantially parallel." A likely point of dispute will be the scope of "substantially." The court may need to determine how much deviation from a perfect U-shape or perfect parallelism is permissible for the accused product to fall within the claim's scope. The complaint's assertion of infringement under the doctrine of equivalents suggests Plaintiff anticipates a defense based on a narrow, literal reading of these terms Compl. ¶54
- Technical Questions: The claim recites "first mounting members" and "second mounting members" with specific functions. The infringement analysis may turn on whether the particular hardware used on the TAMA Fieldstar Carrier (identified by yellow and purple arrows in the complaint's visual aids) performs the claimed securing functions in a way that meets the claim limitations, either literally or as an equivalent structure Compl. ¶55
V. Key Claim Terms for Construction
The Term: "substantially U-shaped intermediate section"
- Context and Importance: This term defines the core geometry of the carrier's frame. Practitioners may focus on this term because the precise shape of the Defendant's frame relative to the claimed "substantially U-shaped" configuration will be a central issue for determining literal infringement.
- Intrinsic Evidence for a Broader Interpretation: The specification describes the section as "substantially conform[ing] in shape over both shoulder regions and across the upper back," which could be argued to encompass a range of ergonomic shapes, not just a geometrically perfect "U" '261 Patent, col. 3:47-50
- Intrinsic Evidence for a Narrower Interpretation: Figure 4 of the patent depicts a specific curvature and a distinct transition from the shoulder area to the back area '261 Patent, Fig. 4 A party could argue that "substantially U-shaped" should be construed more narrowly to a shape that closely tracks this depicted embodiment.
The Term: "mounting members"
- Context and Importance: The "first" and "second" mounting members form the critical links between the frame, the belly plate, and the instrument. The definition of this term is crucial because infringement will depend on whether the accused carrier's connection hardware is structurally and functionally the same as or equivalent to what is claimed.
- Intrinsic Evidence for a Broader Interpretation: The claim language is primarily functional, describing the members as being "for securing" the respective components '261 Patent, claim 1 This could support an interpretation where any component that performs this securing function meets the limitation, regardless of its specific mechanical design.
- Intrinsic Evidence for a Narrower Interpretation: The specification discloses a detailed embodiment of the mounting members, including receptacle bodies, bolts, nuts, and channels '261 Patent, col. 5:4-57 '261 Patent, col. 5:58-col. 6:40 '261 Patent, Fig. 8 An argument could be made that the term should be limited to this disclosed structure and its equivalents, rather than covering all possible mounting mechanisms.
VI. Other Allegations
Indirect Infringement
The complaint alleges induced infringement under 35 U.S.C. § 271(b) Compl. ¶¶121-129 The factual basis includes allegations that Defendants encourage infringement by marketing, distributing, and selling the TAMA Fieldstar Carriers to wholesalers, retailers, and end-users like the Bluecoats drum corps, with knowledge that the products embody the patented invention Compl. ¶126
Willful Infringement
The complaint alleges that Defendants' infringement has been "willful, deliberate, and with full knowledge" Compl. ¶119 This allegation is supported by claims of pre-suit knowledge, based on Defendants' own patent prosecution history where the '261 Patent was cited as prior art in 2012 and discussed in a 2022 application Compl. ¶¶42-43 The complaint also alleges post-notice infringement, citing Defendants' continued marketing and sales after receiving written notice letters from Plaintiff in April and May 2023 Compl. ¶44 Compl. ¶56
VII. Analyst's Conclusion: Key Questions for the Case
Definitional Scope vs. Structural Difference: A central issue will be one of claim construction. Can the term "substantially U-shaped", as defined by the patent's specification and figures, be interpreted to read on the specific geometry of the accused TAMA Fieldstar Carrier frame? The outcome will likely depend on how much structural variance the court permits under the "substantially" modifier, which may require a turn to the doctrine of equivalents.
Evidence of Willfulness: A key question for damages will be culpability. The complaint alleges that Defendants had knowledge of the '261 Patent years before launching the accused product, based on their own patent prosecution files. The court will need to evaluate whether Defendants' decision to launch the Fieldstar Carrier, in light of this alleged knowledge, constituted objectively reckless conduct sufficient to support a finding of willful infringement and potential enhanced damages.
The Functionality Doctrine: The case presents a classic conflict between patent law and trade dress law. Defendants will likely argue that the asserted trade dress elements (e.g., the all-black color scheme, frame shape, and belly plate design) are functional and therefore cannot be protected as trade dress, especially given their relationship to a patented product. A core legal question will be whether Plaintiff can prove that these design choices are primarily non-functional and serve a source-identifying purpose, separate from the utilitarian advantages claimed in the '261 Patent.