Court Opinion

ID: 5141070
Source: CourtListenerOpinion
Date Created: 2021-12-28 17:01:09.114278+00
Date Added: 2024-06-11T08:24:27.150344
License: Public Domain

Case: 21-2137    Document: 50    Page: 1   Filed: 12/28/2021

        NOTE: This disposition is nonprecedential.

   United States Court of Appeals
       for the Federal Circuit
                  ______________________

            LOW TEMP INDUSTRIES, INC.,
                  Plaintiff-Appellee

                            v.

            DUKE MANUFACTURING CO.,
                Defendant-Appellant
               ______________________

                        2021-2137
                  ______________________

    Appeal from the United States District Court for the
 Eastern District of Missouri in No. 4:20-cv-00686-MTS,
 Judge Matthew T. Schelp.
                 ______________________

                Decided: December 28, 2021
                  ______________________

     DAVID CLAY HOLLOWAY, Kilpatrick Townsend & Stock-
 ton LLP, Atlanta, GA, argued for plaintiff-appellee. Also
 represented by COURTNEY DABBIERE, RICHARD W.
 GOLDSTUCKER; KATHLEEN GEYER, Seattle, WA,

   KEVIN DONALD CONNEELY, Stinson LLP, Minneapolis,
 MN, argued for defendant-appellant.
                 ______________________

     Before DYK, TARANTO, and CHEN, Circuit Judges.
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 2       LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.

 CHEN, Circuit Judge.
     Duke Manufacturing Co. (Duke) appeals the entry of a
 preliminary injunction related to its products accused of
 patent infringement by Low Temp Industries, Inc. (LTI).
 The district court found that LTI is likely to show that
 Duke’s accused products infringe several claims of U.S. Pa-
 tent Nos. 8,307,761 (’761 patent) and 8,661,970 (’970 pa-
 tent), and that Duke had failed to raise a substantial
 question of validity as to those claims based on the Fi-
 negan 1 reference. Because the district court relied on an
 erroneous claim construction and misread the Finegan ref-
 erence, it failed to recognize that Duke raised a substantial
 question as to the validity of the relevant claims. We re-
 verse. 2
                         BACKGROUND
                                A
     LTI owns U.S. Patent Nos. 8,307,761 (’761 patent) and
 8,661,970 (’970 patent), 3 which relate to multi-well food
 presentation modules—essentially, a buffet where hot food
 in one well can be next to cold food in another well. See
 ’761 patent at Abstract, col. 1 ll. 6–13. According to the
 common patent specification, prior art food presentation
 equipment, whether a serving bar or some other device, “is
 dedicated to heating or to cooling food contained therein.”
 Col. 1 ll. 34–35; Id. at ll. 43–44 (describing prior art serving
 bar as “dedicated to heating or to cooling all wells.”). The
 specification further explains that it can be “undesirable”
 for dine-in, self-service restaurants with multi-well food
 bars to have all the wells at the same temperature. Id. at
 ll. 55–58. The patents claim to solve what they describe

     1  PCT Pub. No. WO 2000/71950 (Finegan).
     2  Duke’s motion to stay the preliminary injunction
 pending appeal is hereby denied as moot.
    3   The patents share a common specification.
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 LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.       3

 as the “taco-presentation type problem” such that “ambi-
 ent-temperature items (such as tortilla shells), heated
 items (such as meat), and refrigerated items (such as let-
 tuce and cheese)” can be displayed together and in adjacent
 wells in the same food bar. ’761 patent at col. 2 ll. 24–28.
 To accomplish this goal, “[e]ach well is isolated thermally
 from adjacent wells and has an independently controlled
 heating and cooling system.” Id. at ll. 32–33. The specifi-
 cation explains that “pipes 40,” which can carry refriger-
 ant, are in contact with the sidewalls of a well and a
 “heating mechanism” is located below the well floor. Id.,
 col. 4 ll. 29–53.
     Claims 1–4 of the ’761 patent are representative and
 are reproduced in part below:
    1. A food presentation module generally immobile
    in use, comprising:
    a. a frame;
    b. adjacent first and second wells for receiving con-
    tainers of bulk food, each well being individually
    insulated and thermally isolated from an adjacent
    well via interior walls and exterior walls forming
    insulative air gaps therebetween . . .; and
    c. a temperature-control system for controlling
    temperatures of the first and second wells inde-
    pendently . . . such that both wells may be refriger-
    ated, both wells may be heated, or the first or
    second well may be refrigerated while the other of
    the first or second well is heated.
    2. A module according to claim 1 in which the tem-
    perature-control system is configured to allow food
    received in the first well alternately to be heated to
    a temperature substantially above ambient.
    3. A module according to claim 2 in which the tem-
    perature-control system is configured to allow food
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 4     LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.

     received in the second well alternately to be refrig-
     erated to a temperature substantially below ambi-
     ent.
     4. A module according to claim 1, further compris-
     ing one or more additional wells for receiving a con-
     tainer of food and in which the temperature-control
     system controls temperature of the one or more ad-
     ditional wells independently of temperatures of the
     first and second wells.
 ’761 patent at claims 1–4.
                              B
     Finegan discloses a food service display that can be
 used as “an open-topped styled self service food bar [ ] or
 buffet unit [ ] for maintaining food at a desired tempera-
 ture.” Id. at 5, FIG. 1. Cooling coils are mounted along the
 sidewalls of a pan and a heating element is located beneath
 the pan. Id. at 3, FIG. 1. The pan in Finegan’s Figure 1
 embodiment can be operated “in a heating mode or a cool-
 ing mode.” See id. at 5.
     Finegan’s Figure 7, reproduced below, shows an alter-
 native embodiment with “multiple pans 18A, 18B.” See id.
 at 8, FIG. 7. This embodiment includes “[o]ne control sys-
 tem [controller 80 plus sensors that] allow[] the user to
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 LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.      5

 control the temperature of two pans [18A, 18B] inde-
 pendently. For example, one pan could be hot and the other
 pan could be cold.” Id. at 9–10.
                               C
     LTI and Duke are competitors in the market for food
 presentation modules that can maintain adjacent food
 wells at different temperatures. LTI was first to market,
 having developed its QuickSwitch product in 2007. LTI ap-
 plied for patent protection in 2008 which resulted in the
 ’761 and ’970 patents.
      LTI initially sold its QuickSwitch product as a part of
 its own counters. In 2012, LTI began offering QuickSwitch
 through distributors as a drop-in option for its customers’
 counters. Duke was one such customer.
     In 2019, Duke approached LTI about buying the Quick-
 Switch product directly from LTI instead of through a dis-
 tributor; LTI declined. Duke then brought a competing
 Hot-Cold-Freeze (HCF) product to market in 2020. This
 patent infringement suit followed.
      LTI moved for a preliminary injunction enjoining Duke
 from activities related to its allegedly infringing competing
 products. See Low Temp Indus., Inc. v. Duke Mfg. Co., No.
 4:20-CV-00686-MTS, 2021 WL 2634671, at *1 (E.D. Mo.
 June 25, 2021) (PI Order). The district court found that
 each of the four preliminary injunction factors—(1) the
 probability that the movant will prevail on the merits; (2)
 the threat of irreparable harm to the movant; (3) the bal-
 ance between that harm and the harm that granting the
 injunction will inflict on other parties; and (4) the public
 interest—weighed in favor of granting an injunction. See
 id. at *3.
     The district court performed the required two-part
 analysis for likelihood of success on the merits. See id. at
 *4 (“To demonstrate a likelihood of success on the merits,
 LTI must show that (1) it will likely show that Duke’s HCF
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 6       LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.

 infringes any one of the Asserted Patents, and (2) its in-
 fringement claims ‘will likely withstand [Duke’s] chal-
 lenges to the validity and enforceability of the [Asserted
 Patents].’” (alterations in original)). As to infringement,
 the district court determined that LTI is likely to show at
 trial that Duke’s competing product infringes claims 3, 4,
 9, 10, 13, 15, and 16 of the ’761 patent and claim 8 of the
 ’970 patent (the Infringed Claims). See id. at *7. Central
 to that finding was the district court’s construction of the
 claim term “insulative air gaps” or “insulative gaps” to not
 exclude a gap filled with insulation. See id. at *6. 4
      As to Duke’s validity challenge, Duke asserted that the
 Infringed Claims were either anticipated by Finegan or
 rendered obvious by Finegan in view of one or more second-
 ary references. Duke’s invalidity theories accounted for the
 district court’s claim construction. For example, Duke con-
 tended that, if the district court found “insulative air gaps”
 included gaps filled with insulation, then Finegan was an-
 ticipatory for all but claim 4 of the ’761 patent. If, on the
 other hand, the district court limited “insulative air gaps”
 to exclude gaps filled with insulation, Duke’s challenge was
 one of obviousness based on Finegan and a secondary ref-
 erence containing a gap without insulation.
      The district court found Duke’s anticipation arguments
 unpersuasive because Duke’s expert stated that Finegan
 disclosed only “the vast majority of claimed features” and
 because Duke based its anticipation case in part on a le-
 gally incorrect “point of novelty” theory. See id. at *8 &
 n.12. The district court did not address whether or how its
 construction of “insulative air gaps” affected Duke’s inva-
 lidity theories.

     4   Duke does not challenge the district court’s claim
 construction or preliminary infringement determination on
 appeal.
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 LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.         7

     The district court then found that a skilled artisan
 would not have considered the Infringed Claims obvious
 based on Finegan. See id. at *9. The district court con-
 cluded there were “meaningful and relevant” differences
 between Finegan and the Infringed Claims. See id. The
 district court focused on Finegan’s goal of providing frost-
 ing on the pan’s flanges and Finegan’s use of a hot water
 bath to heat the individual pans. See id. Ultimately, the
 district court concluded that:
       Finegan does not . . . disclose or teach two ther-
       mally isolated and insulated ‘pans’ within a single
       module that can be operated at different tempera-
       tures simultaneously. Nor would it be obvious to
       modify Finegan to arrive at the Asserted Patents,
       given Finegan’s incorporation of thermally conduc-
       tive material, emphasis on frosting, and its descrip-
       tion of a single-temperature, one-pan module.
 Id.
     The district court also found that objective indicia of
 nonobviousness supported its conclusions that the In-
 fringed Claims were nonobvious. See id. at *10–11.
 Namely, LTI presented evidence of commercial success and
 that Duke copied LTI’s HCF technology. See id.
      Duke timely appealed the district court’s entry of a pre-
 liminary injunction and specifically its finding that Duke
 failed to raise a substantial question of validity. We have
 jurisdiction pursuant 28 U.S.C. § 1292(c)(1).
                           DISCUSSION
                                A
     Both the Eighth Circuit and the Federal Circuit review
 the grant or denial of a preliminary injunction for abuse of
 discretion. See Dixon v. City of St. Louis, 950 F.3d 1052,
 1055 (8th Cir. 2020); Titan Tire Corp. v. Case New Holland,
 Inc., 566 F.3d 1372, 1375 (Fed. Cir. 2009). “Abuse of
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 8     LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.

 discretion is a deferential standard of review that requires
 a showing that ‘the court made a clear error of judgment in
 weighing relevant factors or exercised its discretion based
 upon an error of law or clearly erroneous factual findings.’”
 Titan Tire, 566 F.3d at 1375 (quoting Genentech, Inc. v.
 Novo Nordisk, A/S, 108 F.3d 1361, 1364 (Fed. Cir. 1997)).
      “In seeking a preliminary injunction, the patentee has
 the burden to show a likelihood of success regarding the
 patent's validity; if the accused infringer raises ‘a substan-
 tial question regarding validity,’ the district court should
 find that the patentee has not shown a likelihood of success
 on the merits.” E.I. du Pont de Nemours & Co. v. MacDer-
 mid Printing Sols., L.L.C., 525 F.3d 1353, 1358 (Fed. Cir.
 2008). “The burden on the accused infringer to show a
 substantial question of invalidity at the preliminary in-
 junction stage is lower than what is required to prove inva-
 lidity at trial.” Tinnus Enterprises, LLC v. Telebrands
 Corp., 846 F.3d 1190, 1205 (Fed. Cir. 2017) (quoting Altana
 Pharma AG v. Teva Pharm. USA, Inc., 566 F.3d 999, 1006
 (Fed. Cir. 2009)). “Vulnerability is the issue at the prelim-
 inary injunction stage, while validity is the issue at trial.”
 Amazon.com, Inc. v. Barnesandnoble.com, Inc., 239 F.3d
 1343, 1359 (Fed. Cir. 2001).
      “Where the alleged infringer attacks the validity of the
 patent, ‘the burden is on the challenger to come forward
 with evidence of invalidity,’ which the patentee must then
 rebut.” Tinnus, 846 F.3d at 1205 (quoting Titan Tire, 566
 F.3d at 1377–78). “[I]f the trial court concludes there is a
 ‘substantial question’ concerning the validity of the patent,
 meaning that the alleged infringer has presented an inva-
 lidity defense that the patentee has not shown lacks sub-
 stantial merit, it necessarily follows that the patentee has
 not succeeded in showing it is likely to succeed at trial on
 the merits of the validity issue.” Titan Tire, 566 F.3d at
 1379.
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 LOW TEMP INDUSTRIES, INC.    v. DUKE MANUFACTURING CO.          9

     As explained below, the district court abused its discre-
 tion in determining that Duke had not raised a substantial
 question of validity as to the Infringed Claims.
                                 B
     The district court initially erred by not considering the
 impact of its construction of “insulative air gap” to Duke’s
 invalidity challenges. The district court was correct that
 Duke’s expert stated at one point that “Finegan discloses
 the vast majority of claimed features” and that “minor
 other features . . . are found in secondary references.” PI
 Order at *8 (citing J.A. 1067). But Duke’s expert made that
 statement with the caveat that, for each of the Infringed
 Claims except for claim 4 of the ’761 patent, a secondary
 reference was required only “[t]o the extent ‘air gaps’ or ‘air
 gap’ (required for each of the Asserted Claims) is construed
 to exclude foam.” See J.A. 1067; see also J.A. 1075 (Duke’s
 expert stating that “[i]f ‘air gaps’ is interpreted . . . to cover
 insulation material (e.g., foam) between the walls, Finegan
 meets [this] element.”). Since the district court construed
 “insulative air gap” as not excluding foam, Duke’s invalid-
 ity challenges for all but one of the Infringed Claims are
 based on anticipation by Finegan. See J.A. 1067–68.
      When properly viewed, Duke’s anticipation challenges
 to claims 3, 9, 10, 13, 15, and 16 of the ’761 patent and claim
 8 of the ’970 patent raise a substantial question of validity.
 Anticipation “under 35 U.S.C. § 102 requires that a prior
 art reference disclose every limitation of the claimed inven-
 tion, either explicitly or inherently.” CommScope Techs.
 LLC v. Dali Wireless Inc., 10 F.4th 1289, 1295 (Fed. Cir.
 2021). LTI has not contested that Finegan’s Figure 7 dis-
 closes two temperature-controlled wells that can be oper-
 ated at different temperatures (one hot and one cold) or
 that Finegan discloses the other required elements of the
 claims (except for claim 4). LTI only disputes whether Fi-
 negan’s wells in Figure 7 are “adjacent” to each other
 within a single module. See Appellee’s Br. 49–53.
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 10    LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.

       The district court clearly erred in finding no substan-
 tial merit as to whether Finegan discloses the adjacent
 wells limitation because (i) the court relied on an overly
 narrow understanding of “adjacent,” and (ii) it did not fully
 account for Finegan’s alternative embodiment disclosed in
 Figure 7 and its corresponding description. First, the dis-
 trict court appeared to understand the claims as requiring
 Finegan, for anticipation purposes, to teach “two immedi-
 ately adjacent pans within a single module that can be
 maintained at different temperatures,” PI Order at *9 (em-
 phasis added), even though the claims require the wells to
 be simply “adjacent.” While the district court did not ex-
 plicitly say so, both parties state that the district court
 adopted LTI’s argument that the adjacency limitation re-
 quires the wells to touch. See Appellant’s Br. 45; Appellee’s
 Br. 49. And that Finegan could not disclose touching wells
 (i.e., immediately adjacent wells) because its protruding
 flanges are thermally conductive, and a hot flange in con-
 tact with a cold flange would destroy Finegan’s goal to pro-
 vide the “attractive feature” of “frosting” or a “frost top” for
 a cold food well, which “give[s] the appearance of the food
 such as salad or additional condiments resting in ice.” See
 Finegan at 1; PI Order at *9. But this constricted under-
 standing of “adjacent” is at odds with the patents’ disclo-
 sure, which describes a “distance D1” “between adjacent
 wells,” “with D1 preferably being approximately three
 inches.” ’761 patent col. 3 ll. 46–52. Given the specification
 explicitly states that adjacent wells preferably have a dis-
 tance between them (and not defined to be bounded by a
 particular outer distance), the basis for the district court’s
 finding that Finegan’s pans 18A and 18B are not adjacent,
 or next to, each other—because Finegan’s cold pan calls for
 frosted flanges—cannot be sustained.
     At this stage of the proceeding and on this record, Duke
 has sufficiently raised a substantial question that Finegan
 anticipates all of the Infringed Claims except for claim 4,
 including disclosure of the adjacency limitation. Finegan’s
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 LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.      11

 Figure 7 discloses a single “apparatus 10” with two wells
 18A and 18B that are independently temperature con-
 trolled by “one control system.” Finegan at 8, 9. Those
 wells are shown within a single countertop 14. Though Fi-
 negan does not disclose any particular measured distance
 between its wells, neither the district court nor LTI pro-
 vides any explanation as to why a disclosure of two wells
 within a single apparatus (with no other components dis-
 posed within the countertop) are not adjacent under a
 proper understanding of that term.
     And to the extent that the district court implicitly
 found that Finegan’s Figure 7 only discloses a single pan in
 each of two separate modules, its order fails to explain the
 basis for that finding as well. 5 In sum, on this record, we
 conclude that the district court abused its discretion in con-
 cluding that Duke failed to raise a substantial question of
 validity as to claims 3, 9, 10, 13, 15, and 16 of the ’761 pa-
 tent and claim 8 of the ’970 patent. Titan Tire, 566 F.3d at
 1379.
                               C
     Duke’s challenge to the remaining Infringed Claim,
 claim 4 of the ’761 patent, is grounded in obviousness under
 the district court’s claim construction. Dependent claim 4
 requires one or more additional wells that are inde-
 pendently temperature controlled. See ’761 patent at claim
 4. Duke acknowledged that Finegan’s two-well disclosure
 does not meet this limitation but argued that additional
 wells would have been obvious in light of Finegan alone,
 see J.A. 1080, and that several other references, including

     5   We also note, contrary to the district court’s conclu-
 sion, that the type of heating mechanism Finegan uses is
 of no moment because the claims do not require a particu-
 lar heating scheme.
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 12       LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.

 the Safyan6, Hansen 7, and Shei 8 references, teach three or
 more independently temperature-controlled wells, see J.A.
 1067, 1082–83, 2269–71, 2275–76, 2279–81, 2283–84.
     We limit our analysis to Finegan in light of Safyan.
 Safyan discloses a “chill-hot buffet tray” with “[a] pair of
 heating and cooling units,” Safyan col. 3 ll. 13–20, and that
 each unit receives a pan of food, see id. at col. 2 ll. 58–59.
 Safyan is not limited to two temperature-controlled pans,
 however. See id. at col. 3 ll. 46–49 (“It is to be understood
 that one or more than two pairs of aligned openings may be
 provided to accommodate as few or as many heating and
 cooling units as may be required or desired.”); see also id.
 at col. 1 ll. 61–63 (“Multiple temperature controlled units
 supported in similar openings may be used for heating
 and/or cooling different foods.”).
      The district court addressed Finegan in light of Safyan
 but limited its analysis to whether Duke improperly relied
 on hindsight to argue that the references rendered obvious
 two wells within the same food bar that simultaneously al-
 low the display of hot and cold foods. See PI Order at *11.
 As we determined above, Duke made the requisite show-
 ing, for purposes of opposing the preliminary injunction
 motion, that Finegan discloses this feature. Thus, the dis-
 trict court’s hindsight finding fares no better.
     At the district court, Duke argued that a skilled artisan
 would have been motivated to add additional wells to Fi-
 negan generally and, further, in light of Safyan’s disclosure
 of more than two wells. See J.A. 1080 (“[I]n view of Finegan
 alone, it would have been obvious to [a skilled artisan] to
 add a third and fourth well.”), 1080–81 (arguing a skilled
 artisan “would have found it obvious to modify Finegan's

      6    U.S. Patent No. 5,941,077 (Safyan).
      7    U.S. Patent No. 5,961,866 (Hansen).
      8    PCT Pub. No. WO 2008/127330 (Shei).
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 LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.      13

 food bar to have three, four, or even more wells (for holding
 additional pans of food) that are all independently control-
 lable with respect to each other” in light of Safyan’s disclo-
 sure); see also J.A. 2275–76 (same).
      LTI responded that a skilled artisan would not modify
 Finegan to include additional wells because “[t]he mechan-
 ical design, heat transfer, and fitment in the Safyan Refer-
 ence are distinctly different from the mechanical design
 described and disclosed in the asserted claims” and thus a
 skilled artisan “would not look to the teaching of Safyan to
 teach the three or more well system of the Asserted Patents
 because Safyan does not consider or teach how refrigera-
 tion would occur in a three or more well system.” See Low
 Temp Indus., Inc. v. Duke Mfg. Co., No. 4:20-CV-00686-
 MTS, ECF No. 43-3 at 32, ¶ 103; see also Appellee’s Br. 28
 (“Safyan . . . disclose[s] mechanical designs, mechanisms of
 heat transfer and fitment that are different from both Fi-
 negan and the Asserted Patents.”). LTI’s argument is not
 responsive to Duke’s position. Duke did not argue that a
 skilled artisan would incorporate Safyan’s heating and
 cooling units into Finegan or that a skilled artisan would
 add one of Safyan’s units to arrive at a third well in Fi-
 negan. Rather, Duke argued that a skilled artisan would
 modify Finegan to include a third (or more) of Finegan’s
 wells. See J.A. 2275–76 (“With the idea of adding a third
 well (or as many as desired or required) introduced by
 Safyan, additional wells to the food bar of Finegan would
 have been no more than a duplication of [Finegan’s] parts
 according to [Finegan’s] methods.”). Duke’s evidence to
 modify Finegan to arrive at claim 4 therefore stands unre-
 butted.
     We next consider the objective indicia of nonobvious-
 ness presented by LTI. See WBIP, LLC v. Kohler Co., 829
 F.3d 1317, 1328 (Fed. Cir. 2016) (“[O]bjective considera-
 tions of non-obviousness must be considered in every
 case.”). The district court found that significant evidence
 supported a finding that Duke copied LTI’s product. See PI
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 14    LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.

 Order at *10. The district court also found that LTI had
 presented evidence of commercial success of its Quick-
 Switch unit. See id. at *11.
      Without commenting on the sufficiency of LTI’s objec-
 tive indicia evidence, our determination that Duke has
 made a sufficient showing, at this stage, that Finegan an-
 ticipates all of the Infringed Claims (except for claim 4) ren-
 ders LTI’s objective indicia irrelevant as to those claims.
 See Cohesive Techs., Inc. v. Waters Corp., 543 F.3d 1351,
 1364 (Fed. Cir. 2008); In re Fracalossi, 681 F.2d 792, 796
 (C.C.P.A. 1982) (concurring opinion) (“[Objective indicia]
 relevant to a case of prima facie obviousness are not con-
 sidered for purposes of determining anticipation.”). As for
 claim 4, LTI did not tie any objective indicia to the presence
 of three or more wells, or to additional wells in combination
 with the features that, there is substantial reason to be-
 lieve on this record, are disclosed by Finegan. At the dis-
 trict court, LTI instead tied its objective indicia evidence to
 the feature of multiple wells in the same food presentation
 module where the module can heat and cool foods at the
 same time. See Low Temp Indus., Inc. v. Duke Mfg. Co.,
 No. 4:20-CV-00686-MTS, ECF No. 43-3 at 55, ¶ 193; id. at
 56, ¶ 194; id. at 56, ¶ 195. Thus, we conclude that at this
 preliminary stage, LTI failed to present sufficient evidence
 of a nexus between any objective indicia and claim 4 of the
 ’761 patent. See Rambus Inc. v. Rea, 731 F.3d 1248, 1257
 (Fed. Cir. 2013) (“[O]bjective evidence of nonobviousness
 lacks a nexus if it exclusively relates to a feature that was
 known in the prior art.”) (citation omitted).
     On the current record, we conclude the district court
 abused its discretion in determining that Duke failed to
 raise a substantial question of validity as to claim 4 of the
 ’761 patent.
                         CONCLUSION
     We have considered LTI’s remaining arguments and
 find them unpersuasive. For the reasons set forth above,
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 LOW TEMP INDUSTRIES, INC.   v. DUKE MANUFACTURING CO.    15

 we reverse the district court’s entry of a preliminary in-
 junction against Duke.
                       REVERSED