Leapers, Inc. v. SMTS, LLC , 879 F.3d 731 ( 2018 )


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  •                            RECOMMENDED FOR FULL-TEXT PUBLICATION
    Pursuant to Sixth Circuit I.O.P. 32.1(b)
    File Name: 18a0009p.06
    UNITED STATES COURT OF APPEALS
    FOR THE SIXTH CIRCUIT
    LEAPERS, INC.,                                           ┐
    Plaintiff-Appellant,   │
    │
    >      No. 17-1007
    v.                                                │
    │
    │
    SMTS, LLC, et al.,                                       │
    Defendants,     │
    │
    SUN OPTICS USA,                                          │
    │
    Defendant-Appellee.
    │
    ┘
    Appeal from the United States District Court
    for the Eastern District of Michigan at Detroit.
    No. 2:14-cv-12290—Robert H. Cleland, District Judge.
    Argued: October 5, 2017
    Decided and Filed: January 10, 2018
    Before: CLAY, COOK, and WHITE, Circuit Judges.
    _________________
    COUNSEL
    ARGUED: Brian D. Wassom, WARNER NORCROSS & JUDD LLP, Southfield, Michigan,
    for Appellant. Joseph F. Cleveland, Jr., BRACKETT & ELLIS, PC, Fort Worth, Texas, for
    Appellee. ON BRIEF: Brian D. Wassom, WARNER NORCROSS & JUDD LLP, Southfield,
    Michigan, Matthew T. Nelson, WARNER NORCROSS & JUDD LLP, Grand Rapids, Michigan,
    for Appellant. Joseph F. Cleveland, Jr., BRACKETT & ELLIS, PC, Fort Worth, Texas, James
    K. Thome, VANDEVEER GARZIA, PC, Troy, Michigan, Douglas P. LaLone, FISHMAN
    STEWART, PLLC, Bloomfield Hills, Michigan, for Appellee.
    No. 17-1007                       Leapers, Inc. v. SMTS, et al.                          Page 2
    _________________
    OPINION
    _________________
    CLAY, Circuit Judge.       Plaintiff Leapers, Inc. appeals the district court’s entry of
    summary judgment for Defendant Sun Optics USA in Plaintiff’s case alleging trade dress
    infringement under the Lanham Act, 15 U.S.C. § 1051, et seq. For the reasons set forth below,
    we VACATE the district court’s judgment and REMAND the case for further proceedings.
    BACKGROUND
    Plaintiff Leapers, Inc. makes adjustable rifle scopes. Several portions of Plaintiff’s
    products are textured with so-called “knurling,” which allows users to grip the products more
    easily and to make fine-tuned adjustments. Knurling can be found on a wide variety of everyday
    items such as door handles, coin edges, and bottle lids. Plaintiff asserts that it uses a unique
    knurling pattern that is distinctly “ornamental” and by which consumers recognize Plaintiff as
    the source of the product.
    Plaintiff began manufacturing rifle scopes bearing this particular knurling design in 2002.
    Plaintiff later entered into an exclusive manufacturing contract with Chuanwen Shi and Donghui
    Yang of the Nantong WuYang Sporting Goods factory in China. As part of this contract, the
    factory managers agreed to “never disclose any information related to [Plaintiff’s] products.”
    (R. 109 at PageID #4776.)
    On November 17, 2011, Plaintiff ended its relationship with the Nantong WuYang
    factory, and factory representatives agreed to “cease using any and all technical specifications,
    product design documents, [and] packaging design documents related to any of [Plaintiff’s]
    products” and to “[d]estroy any and all parts, accessories, attachments, and the like, related to
    any of [Plaintiff’s] products previously produced to fulfill [Plaintiff’s] orders.” (Id.) However,
    factory manager Shi apparently never followed through on this agreement. Instead, he formed a
    company called Trarms, Inc., through which he began selling rifle scopes himself. He also
    began manufacturing rifle scopes for other sellers of rifle scopes, including Defendant and
    another company, SMTS, LLC.
    No. 17-1007                              Leapers, Inc. v. SMTS, et al.                                     Page 3
    On June 10, 2014, Plaintiff filed suit against Defendant1 seeking monetary and injunctive
    relief for trade dress infringement of Plaintiff’s rifle scope knurling design. The case progressed
    to discovery, and factory manager Shi refused to testify, asserting his Fifth Amendment privilege
    to nearly every question asked. When Trarms, Inc. refused to provide an alternate witness,
    Plaintiff moved to compel discovery.
    Defendant filed for summary judgment on the basis that Plaintiff would not be able to
    prove two essential elements of its trade dress claim, namely nonfunctionality and secondary
    meaning. As further discussed below, the combination of these two elements ensures that a
    product feature receives trade dress protection only if it does not contribute to the product’s
    utility (i.e., is nonfunctional) and confers distinctiveness akin to a brand (i.e., has a secondary
    meaning). Defendant argued that the district court should grant summary judgment despite
    Plaintiff’s pending discovery motion because Shi’s testimony would be irrelevant to both of
    these elements. Plaintiff opposed summary judgment, arguing that it had sufficiently supported
    its trade dress claim and that additional discovery from Shi or Trarms, Inc. would demonstrate
    that “[t]he elements of [Plaintiff’s] trade dress were not chosen for functional reasons and do not
    add to the functionality of the scopes to which they are applied.” (R. 81 ¶ 5(l); R. 84.) Plaintiff
    also argued that additional discovery was necessary on the issue of secondary meaning.
    The district court granted Defendant’s motion for summary judgment. The court rejected
    the notion that summary judgment was premature, concluding that Plaintiff’s knurling design
    could not satisfy the nonfunctionality requirement. The court stated that additional discovery
    from Shi would provide “but one more conclusory opinion” that could not “change the fact that
    Plaintiff’s trade dress is a functional grip, not just decoration.” Leapers, Inc. v. SMTS, LLC,
    
    2016 WL 8732507
    , at *8 (E.D. Mich. Mar. 25, 2016). The court’s holding did not reach the
    question of secondary meaning, but the court opined that Plaintiff had likely introduced enough
    evidence—although barely—to create a triable question on the issue.
    The district court denied Plaintiff’s motion for reconsideration and entered final judgment
    on December 2, 2016. Plaintiff then filed this timely appeal.
    1
    Plaintiff also filed suit against Trarms, Inc. and SMTS, LLC but has since resolved its claims against these
    parties. This appeal therefore concerns only a single defendant, Sun Optics USA.
    No. 17-1007                       Leapers, Inc. v. SMTS, et al.                            Page 4
    DISCUSSION
    A. Standard of Review
    We review de novo a district court’s grant of summary judgment in a trade dress claim
    case. See Gibson Guitar Corp. v. Paul Reed Smith Guitars, LP, 
    423 F.3d 539
    , 546 (6th Cir.
    2005). Summary judgment is proper when “there is no genuine issue as to any material fact and
    . . . the moving party is entitled to a judgment as a matter of law.” 
    Id. (quoting Fed.
    R. Civ. P.
    56(c)). This Court must draw all reasonable inferences in favor of the non-moving party. 
    Id. B. Analysis
    The Lanham Act’s protection extends to trade dress. Wal-Mart Stores, Inc. v. Samara
    Bros., 
    529 U.S. 205
    , 210 (2000); Groeneveld Transp. Efficiency, Inc. v. Lubecore Int’l., Inc.,
    
    730 F.3d 494
    , 503 (6th Cir. 2013). As this Court has previously explained:
    “Trade dress” refers to the image and overall appearance of a product.
    It embodies that arrangement of identifying characteristics or decorations
    connected with a product, whether by packaging or otherwise, that makes the
    source of the product distinguishable from another and promotes its sales. Trade
    dress involves the total image of a product and may include features such as size,
    shape, color, or color combinations, texture, graphics, or even particular sales
    techniques.
    Abercrombie & Fitch Stores, Inc. v. Am. Eagle Outfitters, Inc., 
    280 F.3d 619
    , 629 (6th Cir. 2002)
    (internal citations and punctuation marks omitted).
    The Lanham Act, 15 U.S.C § 1125(a), creates a civil cause of action for trade dress
    infringement. In relevant part, the statute provides:
    Any person who, on or in connection with any goods or services, or any container
    for goods, uses in commerce any word, term, name, symbol, or device, or any
    combination thereof, or any false designation of origin, false or misleading
    description of fact, or false or misleading representation of fact, which—
    (A) is likely to cause confusion, or to cause mistake, or to deceive as to the
    affiliation, connection, or association of such person with another person,
    or as to the origin, sponsorship, or approval of his or her goods, services,
    or commercial activities by another person . . . shall be liable in a civil
    action by any person who believes that he or she is or is likely to be
    damaged by such act.
    No. 17-1007                           Leapers, Inc. v. SMTS, et al.                            Page 5
    In order to prevail on a claim for trade dress infringement based on a product’s design, a
    plaintiff must show that its design is (1) nonfunctional, (2) has acquired a secondary meaning,
    and (3) is confusingly similar to the allegedly infringing design. 
    Groeneveld, 730 F.3d at 504
    (citing Gen. Motors Corp. v. Lanard Toys, Inc., 
    468 F.3d 405
    , 414 (6th Cir. 2006)). The
    Supreme Court has cautioned against misuse or overextension of trade dress, explaining that
    “product design almost invariably serves purposes other than source identification.” See Samara
    
    Brothers, 529 U.S. at 213
    . Summary judgment will be granted if the plaintiff “fails to present
    sufficient evidence for a reasonable jury to find in its favor on any one of the three elements.”
    See 
    Groeneveld, 730 F.3d at 504
    (citing Celotex Corp. v. Catrett, 
    477 U.S. 317
    , 322 (1986)).
    Plaintiff alleges that four design elements collectively serve as the “identifying
    characteristics or decorations connected with [its] product . . . that makes the source of the
    product distinguishable from another and promotes its sales.” See 
    Abercrombie, 280 F.3d at 629
    (internal alterations omitted). These design elements are (1) “wave-like scalloping” with soft,
    round edges; (2) straight, parallel, unbroken lines; (3) consistent use of wavelike scalloping at all
    relevant points on the rifle scopes, including at the ocular and objective ends as well as on the
    adjustment knobs; and (4) wide banding, with rough proportionality between the raised and
    lowered portions of the scalloping.
    1. Nonfunctionality
    The nonfunctionality requirement “channel[s] the legal protection of useful designs from
    the realm of trademark to that of patent.” 
    Groeneveld, 730 F.3d at 508
    . “Such channeling
    ensures that the high public costs of monopoly are not imposed without an assurance that the
    design    satisfies   the   rigorous    requirements    of   patentability,   including   novelty    and
    nonobviousness, and is protected for only a limited period of time.” 
    Id. (citing Qualitex
    Co. v.
    Jacobson Products Co., Inc., 
    514 U.S. 159
    , 164–65 (1995)).
    In Inwood Labs., Inc. v. Ives Labs., Inc., 
    456 U.S. 844
    , 850 n.10 (1982), the Supreme
    Court explained that “a product feature is functional if it is essential to the use or purpose of the
    article or if it affects the cost or quality of the article.” In order to prove nonfunctionality, then, a
    plaintiff must prove that its design does not meet either prong of the Inwood functionality test,
    No. 17-1007                        Leapers, Inc. v. SMTS, et al.                            Page 6
    viz, the plaintiff must show that its design feature is not “essential to the use or purpose of the
    article” and that it does not “affect[] the cost or quality of the article.” See 
    Inwood, 456 U.S. at 850
    n.10.
    In Groeneveld, this Court examined whether certain elements of a grease pump’s design
    were eligible for trade dress protection. Applying the Inwood inquiry, we found that each of the
    design elements either reduced production costs or augmented the usefulness of the grease pump:
    The shape of the base is functionally determined because it minimizes the amount
    of material needed in construction. And the volume of the reservoir is
    functionally dictated by the amount of grease that the vehicle needs during each
    servicing interval. The use of clear material in the reservoir is also functional
    because it allows one to easily see how much grease is left in the 
    pump. 730 F.3d at 505
    . Thus, the grease pump’s design was functional and could not receive trade
    dress protection.
    Not every case is so clear-cut.       The burden of proving nonfunctionality is unusual
    because it requires a party to introduce affirmative evidence that a quality is not present—to
    introduce “evidence of an absence” rather than merely an absence of evidence. Evidence that a
    product design is purely “ornamental, incidental, or arbitrary” can be evidence of an absence of
    functionality. See TrafFix Devices, Inc. v. Mktg. Displays, Inc., 
    532 U.S. 23
    , 30 (2001).
    Evidence of aesthetic intent—that the product was designed for an aesthetic purpose—
    tends to show that a product’s design is purely ornamental, incidental, or arbitrary. Intent,
    however, is not conclusive; not every design created for an aesthetic purpose will turn out to be
    nonfunctional. Indeed, a design might turn out to have functional value despite any original
    aesthetic intent if the design becomes “essential to the use or purpose of the article” or if it turns
    out to “affect[] the cost or quality of the article.” See 
    Inwood, 456 U.S. at 850
    n.10. For
    example, a new windshield designed solely for the purpose of making a sedan more visually
    appealing will nevertheless be deemed functional if the windshield turns out to be more
    aerodynamic or cheaper to produce than other designs. Thus, proof of aesthetic intent alone
    cannot establish nonfunctionality due to the possibility of incidental functionality.
    No. 17-1007                        Leapers, Inc. v. SMTS, et al.                            Page 7
    Aesthetic intent alone is also insufficient because some products function based on their
    aesthetic properties through so-called “aesthetic functionality.” See 
    Abercrombie, 280 F.3d at 642
    . A design has aesthetic functionality when it communicates the use, purpose, cost, or quality
    of the product in a way that competitors cannot avoid replicating without incurring costs “not to
    copy but to design around.” See 
    id. at 642–43
    (quoting W.T. Rogers Co. v. Keene, 
    778 F.2d 334
    ,
    340 (7th Cir. 1985)). But “there are few aesthetic designs that are so fundamental to an industry
    that competitors cannot fairly compete without free use of [them].” 1 McCarthy on Trademarks
    and Unfair Competition § 7:81 (5th ed.). Thus, a party’s initial burden to show that a design
    lacks aesthetic functionality is not substantial; the plaintiff need only show that the design is not
    a competitive necessity such that “exclusive use . . . would put competitors at a significant non-
    reputation related disadvantage.” See 
    TrafFix, 532 U.S. at 32
    –33 (internal citations, quotations,
    and alterations omitted).
    In Abercrombie, the plaintiff clothing manufacturer sought trade dress protection for the
    design of its clothing line, which it defined broadly to include any of the following words or
    phrases printed on any “solid, plaid and stripe design[]” and in any “primary color
    combination[]”: performance, authentic, genuine brand, trademark, and since 
    1892. 280 F.3d at 643
    . Although there was no indication that the use of such designs affected the clothing’s fit,
    comfort, or durability, the plaintiff conceded that consumers’ aesthetic tastes drove the market
    for its clothing. See 
    id. Indeed, the
    plaintiff said that its design was expressive with regard to the
    quality of the clothing, “convey[ing] the reliability of the ... brand” both in stores and when
    worn. See 
    id. This evidence,
    along with the sheer breadth of the plaintiff’s purported trade
    dress, indicated that exclusive use of the design would leave competitors at a significant, non-
    reputation related disadvantage in the market for “reliable rugged and/or athletic casual clothing
    drawn from a consistent texture, design, and color palette.” 
    Id. Lacking any
    evidence to the
    contrary, this Court concluded that the design had aesthetic functionality.
    By contrast, the plaintiff automobile manufacturer in General Motors Corp. v. Lanard
    Toys, Inc. succeeded in its claim that the defendant, a toy car manufacturer, infringed its trade
    dress by copying the aesthetic design of its Humvee vehicle. 
    468 F.3d 405
    , 416–17 (6th Cir.
    2006). A witness for the plaintiff testified that the Humvee’s design was motivated purely by
    No. 17-1007                      Leapers, Inc. v. SMTS, et al.                          Page 8
    aesthetics and not by function. 
    Id. The plaintiff’s
    purported trade dress consisted of a specific
    grille design, a slanted and raised hood, a two-panel windshield, rectangular doors, and squared
    edges. 
    Id. at 417.
    These features were expressive; they communicated the use and purpose of
    the Humvee as a strong, hardwearing vehicle. See 
    id. Although this
    suggested the possibility of
    aesthetic function, the plaintiff also introduced evidence that the market for the Humvee was not
    driven by aesthetics, meaning that exclusive use of its design would not significantly impact
    competition. See 
    id. Specifically, the
    plaintiff showed that the Humvee was designed to meet
    military specifications, none of which described the aesthetic design elements at issue. See 
    id. Additionally, the
    plaintiff emphasized the narrow definition of its design, which would allow
    competitors to create a wide range of strong, hardwearing designs without incurring costs “not to
    copy but to design around” the Humvee’s design. Based on this evidence, we concluded that the
    plaintiff had met its burden to show that its design was purely ornamental and therefore
    nonfunctional. See 
    id. Similarly, an
    aesthetic design that merely communicates the source of the article—rather
    than anything about the article’s use, purpose, cost, or quality—is not functional. In Qualitex
    Company v. Jacobson Products Company, 
    514 U.S. 159
    (1995), the Supreme Court examined a
    trade dress claim brought by a manufacturer of dry cleaning pads. The manufacturer dyed its dry
    cleaning pads an unusual, glossy color that it called “green-gold,” and it sought to prevent a
    competitor from using the same color for its pads. 
    Qualitex, 514 U.S. at 161
    . The Court held
    that “a color may sometimes meet the basic legal requirements,” for trade dress protection,
    including nonfunctionality. 
    Id. at 174.
    The Court imagined circumstances where a product’s
    color would be dictated by functional requirements, such as when the key ingredient of a drug
    has a distinctive color. 
    Id. at 169.
    The Court also considered circumstances where a color would
    have aesthetic function, such as when the black color of a boat motor functioned to “decreas[e]
    the apparent size of the motor and ensur[e] compatibility with many different boat colors.” 
    Id. Absent any
    indication that the green-gold color of the plaintiff’s dry cleaning pads had such
    functionality, however, the Court concluded that the color could constitute trade dress. 
    Id. at 173–74.
     No. 17-1007                        Leapers, Inc. v. SMTS, et al.                             Page 9
    In this case, Plaintiff admits that knurling is a functional component of a rifle scope.
    Plaintiff argues, however, that it applies a purely ornamental design to the knurling on its rifle
    scopes and that this design—not knurling generally—constitutes its trade dress. A knurling
    pattern can be purely ornamental, at least as a hypothetical matter; a unique knurling pattern—
    perhaps in the shape of a company’s name or logo—could have no impact on the knurling’s
    functionality. Cf. 
    Qualitex, 514 U.S. at 169
    –74. As long as the pattern is not “essential to the
    use or purpose” of a rifle scope and does not “affect[] the cost or quality” of a rifle scope, the
    knurling design confers no incidental functionality. And as long as the knurling design does not
    have an aesthetic function such that “exclusive use of the feature would put competitors at a
    significant non-reputation-related disadvantage,” the design also lacks aesthetic function and can
    be protected as trade dress—just like the unique color of a dry cleaning pad, see 
    Qualitex, 514 U.S. at 170
    , or the unique aesthetic of a Humvee, see Lanard 
    Toys, 468 F.3d at 416
    –17.
    A jury could reasonably conclude that Plaintiff’s knurling design is purely ornamental
    and therefore nonfunctional.      Plaintiff introduced various testimonies to demonstrate that
    Plaintiff is unaware of any functional benefit of its design and that Plaintiff chose the design for
    a purely aesthetic purpose: to make the scopes “stand out from the competition.” (R. 82 at
    PageID #3769; R. 86-17 at PageID #4291.) If the jury finds these testimonies credible, it could
    conclude that Plaintiff did not achieve functionality where none was intended—so long as
    Plaintiff adequately rebuts the possibilities of incidental functionality and aesthetic functionality.
    Plaintiff also provided evidence negating incidental functionality. Plaintiff showed that
    its competitors apply knurling to their rifle scopes’ adjustment knobs in a wide variety of
    patterns, many of which are more effective than Plaintiff’s design at making the knobs’
    adjustment surfaces graspable. In other words, Plaintiff adorns its products with a knurling
    pattern that is not particularly effective at achieving knurling’s primary purpose. A jury could
    therefore conclude that Plaintiff’s design does not represent a technological advancement, even
    by accident, and that its claim need not be “channel[ed] . . . from the realm of trademark to that
    of patent.” See 
    Groeneveld, 730 F.3d at 508
    .
    Finally, Plaintiff introduced evidence that its design lacks aesthetic functionality.
    The record indicates that competition in the rifle scope industry is not based on the visual appeal
    No. 17-1007                        Leapers, Inc. v. SMTS, et al.                          Page 10
    of knurling or of adjustment knobs more generally; instead, rifle scope manufacturers design
    their knobs “in ways that allow them to be better gripped to perform the function of adjustment.”
    (R. 109 at PageID #4786.) Even so, Defendant argues that the range of available knurling
    designs is limited by functional requirements, especially the requirement of making the surface
    of an adjustment knob more graspable without compromising the structural integrity of the knob.
    If the range of available designs is truly constrained, any claim of trade dress protection must fail
    due to competitive necessity. But Plaintiff introduced its own expert report, which states that the
    elements of its design are not dictated by functional requirements. Although this conclusory
    assertion on its own would not be enough to withstand summary judgment, the report also
    incorporates pictures of numerous knurling designs that are currently used in the market. These
    images cast doubt on Defendant’s assertion of a design constraint and would allow a jury to find
    that the variety of knurling patterns that can be applied to an adjustment knob is effectively
    unlimited, much like the variety of colors that that can be applied to a dry cleaning pad. See
    
    Qualitex, 514 U.S. at 169
    –74. Finding no “scarcity” or “depletion” of available designs, the jury
    could then conclude that exclusive use of Plaintiff’s design would not put competitors at a
    significant, non-reputation related disadvantage. See 
    id. (rejecting “color
    depletion” argument).
    Plaintiff asserts that Chuanwen Shi, or an alternate witness from Trarms, Inc., would
    buttress this evidence of nonfunctionality by testifying that Plaintiff’s design elements “do not
    add to the functionality of the scopes to which they are applied.” Contrary to the district court’s
    conclusion that this testimony would be merely a “conclusory opinion,” we consider testimony
    from a direct competitor to be strongly probative of whether “exclusive use of the feature would
    put competitors at a significant non-reputation-related disadvantage.” See 
    TrafFix, 532 U.S. at 32
    . A competitor who copies a design has a strong incentive to identify the functional benefits of
    the copied design. Thus, credible evidence of a competitor’s fruitless search for function is
    evidence of nonfunction. In the unusual circumstances here, where a competitor’s corporate
    representative invokes his Fifth Amendment privilege in order to avoid answering questions
    about a product’s functionality—and where the company refuses to designate a different witness
    to testify—a jury could reasonably infer that the competitor tried and failed to identify any
    functionality. See Baxter v. Palmigiano, 
    425 U.S. 308
    , 318 (1976) (holding that a party’s refusal
    to testify in response to probative evidence offered against it in a civil action permits an adverse
    No. 17-1007                         Leapers, Inc. v. SMTS, et al.                            Page 11
    inference); Johnson v. United Parcel Serv., Inc., 117 F. App’x 444, 455 (6th Cir. 2004) (applying
    Baxter to draw inference in favor of non-movant).
    Furthermore, Plaintiff has shown that Shi, the corporate designee, attempted to register a
    design patent in China covering Plaintiff’s alleged trade dress. Plaintiff argues that Shi’s pursuit
    of a design patent, as opposed to an invention or utility model patent, provides further evidence
    that Shi considers Plaintiff’s design to lack any functional value. See Patent Law (promulgated
    by the State Intellectual Property Office of the P.R.C., effective Dec. 27, 2008), art. 2 (defining
    types of patents under Chinese law). A jury could indeed draw an inference that Shi is unaware
    of any functional benefit that would qualify Plaintiff’s design for protection under an invention
    or utility model patent.
    From this evidence, a jury could properly conclude that Plaintiff’s design is purely
    ornamental and therefore nonfunctional. The district court therefore erred when it granted
    summary judgment to Defendant on the basis of nonfunctionality. Indeed, the district court
    incorrectly concluded that knurling designs are per se functional, stating the following:
    [T]he “design” all witnesses refer to is the design of a grip. A grip is inalterably
    functional. It exists to grasp or grip a thing more securely. Because the scope
    could not function without the grip—in that it could not be adjusted as to focus—
    it is “essential to the use or the purpose” of the scope in question.
    Leapers, Inc. v. SMTS, LLC, 
    2016 WL 8732507
    , at *5 (E.D. Mich. Mar. 25, 2016). The district
    court was correct that knurling is “inalterably functional” in that it allows a rifle scope user to
    “grasp or grip a thing more securely.” However, Plaintiff does not assert that its trade dress
    consists of knurling; rather, Plaintiff alleges that its trade dress consists of a unique design that is
    printed into knurling. Thus, the nonfunctionality inquiry in this case must focus on the design of
    Plaintiff’s knurling and not on knurling in general. The district court erred by failing to make
    this distinction during summary judgment.
    The district court acknowledged this distinction in a subsequent order.             The court
    recognized that “some aspect of a grip design could conceivably be nonfunctional,” and gave the
    example of “a particular color pattern.” Leapers, Inc. v. SMTS, LLC, 
    2017 WL 3084370
    , at *4
    (E.D. Mich. July 20, 2017). The court then found, incorrectly, that Plaintiff’s knurling pattern
    No. 17-1007                       Leapers, Inc. v. SMTS, et al.                          Page 12
    does not qualify for such a distinction because it “is inseparable from how the grip on the various
    adjustment knobs perform its function—which is to provide a surface to grip the knob.” 
    Id. We disagree
    that there is a meaningful distinction between a pattern and a color; both types of
    ornamentation can be nonfunctional.
    The district court’s concern appears to stem from the possibility that Plaintiff’s design is
    not distinctive enough to be “divorced from the functional nature of the grip.” See 
    id. Whether an
    untrained observer is likely to recognize Plaintiff’s knurling as branded rather than quotidian
    is irrelevant to the nonfunctionality inquiry. Instead, the distinctiveness of the design relates to
    whether it is capable of establishing a secondary meaning.
    2. Secondary Meaning
    Secondary meaning “serves to identify the product with its manufacturer or source.”
    
    TrafFix, 532 U.S. at 28
    . “To establish secondary meaning, a manufacturer must show that, in the
    minds of the public, the primary significance of a product feature or term is to identify the source
    of the product rather than the product itself.” 
    Inwood, 456 U.S. at 851
    n.11. “This Court applies
    a seven-factor test to determine whether secondary meaning exists in a trade dress: (1) direct
    consumer testimony, (2) consumer surveys, (3) exclusivity, length, and manner of use,
    (4) amount and manner of advertising, (5) amount of sales and number of customers,
    (6) established place in the market, and (7) proof of intentional copying.” Lanard 
    Toys, 468 F.3d at 418
    . “No single factor is determinative and every one need not be proven.” Herman Miller,
    Inc. v. Palazzetti Imports & Exports, Inc., 
    270 F.3d 298
    , 312 (6th Cir. 2001) (citing Centaur
    Communications, Ltd. v. A/S/M Communications, Inc., 
    830 F.2d 1217
    , 1222 (2d Cir. 1987)).
    Even so, “[t]he evidentiary burden necessary to establish secondary meaning is substantial.”
    DeGidio v. W. Grp. Corp., 
    355 F.3d 506
    , 513 (6th Cir. 2004) (quoting Burke–Parsons–Bowlby
    Corp. v. Appalachian Log Homes, Inc., 
    871 F.2d 590
    , 596 (6th Cir. 1989). Secondary meaning
    can only be established if a party shows by a preponderance of the evidence that consumers view
    the trade dress as denoting “a single thing coming from a single source.” See 
    id. (quoting Burke–
    Parsons-Bowlby, 871 F.2d at 596
    ).
    No. 17-1007                           Leapers, Inc. v. SMTS, et al.                       Page 13
    Defendant invites this Court to affirm on the basis that no reasonable jury could conclude
    that Plaintiff’s knurling design has acquired a secondary meaning. We decline to do so. The
    district court did not resolve the issue of secondary meaning below. Although it was “inclined to
    find that the Plaintiff has furnished enough evidence—barely—to survive summary judgment on
    this point,” the district court examined only two of the seven factors relating to secondary
    meaning, concluded that several of the other factors were “irrelevant,” and ultimately declined to
    rule on the matter as a whole. Leapers, 
    2017 WL 3084370
    , at *3–4. The district court declined
    to fully develop a secondary meaning analysis and instead opted to treat distinctiveness as a
    factor relating to nonfunctionality.
    Nevertheless, we decline to conduct a more thorough secondary meaning inquiry on this
    record because of the possibility that more discovery may be conducted on remand due to
    Plaintiff’s pending discovery request. Whether additional discovery is appropriate is a question
    left to the sound discretion of the district court. We therefore remand the case so that the district
    court can consider Plaintiff’s request for additional discovery, to be followed by a definitive
    ruling on whether Plaintiff has created a genuine issue regarding whether its design has
    established a secondary meaning.
    CONCLUSION
    In conclusion, a jury could reasonably find that Plaintiff’s design is nonfunctional
    because Plaintiff’s design is purely ornamental. We therefore hold that the district court erred by
    granting summary judgment for Defendant based on the nonfunctionality element of Plaintiff’s
    trade dress claim. Additionally, the district court declined to resolve the issue of secondary
    meaning. Because proper resolution of this issue requires further consideration of Plaintiff’s
    request for additional discovery, we decline to reach it.
    For the foregoing reasons, we VACATE the district court’s judgment and REMAND the
    case for further proceedings consistent with this opinion.