Court Opinion

ID: 6118810
Source: CourtListenerOpinion
Date Created: 2022-02-04 17:00:54.419637+00
Date Added: 2024-06-11T08:22:43.439737
License: Public Domain

Case: 20-2011    Document: 61     Page: 1   Filed: 02/04/2022

   United States Court of Appeals
       for the Federal Circuit
                  ______________________

                      APPLE INC.,
                    Plaintiff-Appellant

                             v.

                     WI-LAN INC.,
                Defendant-Cross-Appellant
                 ______________________

                   2020-2011, 2020-2094
                  ______________________

    Appeals from the United States District Court for the
 Southern District of California in Nos. 3:14-cv-02235-DMS-
 BLM, 3:14-cv-1507-DMS-BLM, Judge Dana M. Sabraw.
                  ______________________

                Decided: February 4, 2022
                 ______________________

     MARK S. DAVIES, Orrick, Herrington & Sutcliffe LLP,
 Washington, DC, argued for plaintiff-appellant. Also rep-
 resented by BENJAMIN PAUL CHAGNON, JAMES ANGLIN
 FLYNN, KATHERINE M. KOPP; MAX CARTER-OBERSTONE, San
 Francisco, CA; THOMAS KING-SUN FU, Los Angeles, CA;
 SEAN C. CUNNINGHAM, ERIN GIBSON, STANLEY JOSEPH
 PANIKOWSKI, III, DLA Piper LLP (US), San Diego, CA.

    JEFFREY A. LAMKEN, MoloLamken LLP, Washington,
 DC, argued for defendant-cross-appellant. Also repre-
 sented by RAYINER HASHEM, LUCAS M. WALKER; LEONID
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 2                                  APPLE INC.   v. WI-LAN INC.

 GRINBERG, New York, NY; WARREN LIPSCHITZ, MIKE
 MCKOOL, McKool Smith, PC, Dallas, TX.
              ______________________

     Before MOORE, Chief Judge, BRYSON and PROST, Circuit
                           Judges.
 MOORE, Chief Judge.
     The U.S. District Court for the Southern District of
 California entered a final judgment (1) that Apple in-
 fringed claims 9, 26, and 27 of U.S. Patent No. 8,457,145
 and claim 1 of U.S. Patent No. 8,537,757; (2) that those
 claims had not been proven invalid; and (3) that awarded
 Wi-LAN $85.23 million in damages. Apple appeals, and
 Wi-LAN cross-appeals. For the following reasons, we af-
 firm-in-part, reverse-in-part, vacate-in-part, and remand.
                        BACKGROUND
                              I
      The ’145 patent is directed to allocating bandwidth in
 a wireless communication system. ’145 patent at Abstract,
 1:28–30. Wireless communication systems facilitate two-
 way communication between user devices (e.g., mobile
 phones) and an associated fixed network infrastructure
 (e.g., wire-line system). Id. at 1:36–47. The wireless net-
 work described in the ’145 patent does so using subscriber
 units associated with the user devices. Id. The subscriber
 units communicate with a base station connected to the
 fixed network infrastructure. Id. Because each base sta-
 tion has limited bandwidth for transmissions to and from
 the subscriber units it supports, those subscriber units
 must share bandwidth. Id. at 9:8–11. To that end, the sub-
 scriber units send bandwidth requests to the base station,
 which then allocates bandwidth. Id. at 3:19–28. This pro-
 cess itself also requires bandwidth. The ’145 patent pur-
 ports to provide a bandwidth allocation method that
 requires less bandwidth. Id. at 5:41–43, 51–56; 6:65–67.
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 APPLE INC.   v. WI-LAN INC.                                   3

 In one aspect, each subscriber unit, rather than the base
 station, maintains and allocates bandwidth across data
 queues for the physical channels it serves (e.g., data or
 voice), relieving the base station from performing these
 tasks. Id. at 7:39–53; 8:8–14; 22:25–38. In another aspect,
 each subscriber unit aggregates bandwidth requests across
 different queues and sends them out periodically, rather
 than separately passing each bandwidth request to the
 base station. Id. at 27:4–11. Asserted independent claims
 9 and 26 recite:
    9. A subscriber unit for a wireless communication
    system, wherein the wireless communication sys-
    tem includes a plurality of subscriber units in com-
    munication with an associated base unit,
    comprising:
        a plurality of queues, each queue for group-
        ing data based on the QoS; and
        a media access (MAC) module configured to
               set an initial value for a timer asso-
               ciated with a queue, and
               periodically, on expiration of the
               value of the timer, transmit a band-
               width request indicating an
               amount of bandwidth required for
               transmitting the data from the
               queue.
    26. A subscriber unit for a wireless communication
    system, comprising:
        a plurality of queues for buffering user traf-
        fic according to a traffic parameter, each
        queue having an associated logical state;
        a media access control (MAC) element ca-
        pable of
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 4                                   APPLE INC.   v. WI-LAN INC.

            transmitting an uplink (UL) band-
            width request based on the logical
            state of the queues during a band-
            width request opportunity, and
            allocating between the queues a
            bandwidth allocation received in
            response to the UL bandwidth re-
            quest, based on the current state of
            the queues.
     The ’757 patent, while unrelated to the ’145 patent, is
 directed to similar subject matter. See ’757 patent at Ab-
 stract, 1:27–29. The patent purports to improve signal
 quality and offer greater error protection in data transmis-
 sion using a modulation scheme. Id. at 4:53–5:46. Claim
 1 recites:
     A subscriber station for a wireless communication
     system comprising:
        a modem section configured to receive
        downlink data from a base station on a
        downlink link and to transmit uplink data
        to the base station on an uplink link shared
        with other subscribers stations;
        a receive signal quality module configured
        to monitor a downlink (DL) quality param-
        eter for the downlink data providing a pa-
        rameter value; and
        a control section configured to:
            determine a preferred downlink
            physical (PHY) mode for the down-
            link data among a plurality of PHY
            modes of different degrees of ro-
            bustness, the preferred downlink
            PHY mode being defined between a
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 APPLE INC.   v. WI-LAN INC.                                 5

               first and a second threshold for the
               parameter value;
               instruct the modem section to
               transmit to the base station an in-
               dication of the preferred downlink
               PHY mode;
               identify in a DL sub-frame map re-
               ceived from the base station, a cur-
               rent downlink PHY mode selected
               for the subscriber station based on
               the preferred downlink PHY mode
               and the bandwidth available to the
               subscriber station on the downlink
               link; and
               instruct the modem section to re-
               ceive the downlink data based on
               the current downlink PHY mode,
        wherein the downlink PHY mode specifies
        a modulation format and a forward error
        correction technique used for transmission
        of downlink data.
                                II
      In May 2014, Apple sued Wi-LAN in the Southern Dis-
 trict of California, seeking a declaratory judgment of non-
 infringement and invalidity for all claims of the ’145 and
 ’757 patents. Wi-LAN counterclaimed, alleging that cer-
 tain Apple devices—including the iPhone 6, iPhone 6 Plus,
 iPhone 5, iPhone 5S, and iPhone 5C—infringed at least one
 claim of those patents based on their use of the Long-Term
 Evolution (LTE) wireless communication standard. 1 Wi-

    1    Apple also sought declaratory judgment, and Wi-
 LAN counterclaimed, on claims of other patents not at is-
 sue in this appeal.
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 6                                   APPLE INC.   v. WI-LAN INC.

 LAN contended that its patented technology enabled Voice
 over Long-Term Evolution (VoLTE), which provides voice
 call service over a 4G LTE network.
      During claim construction, the parties disputed the
 construction of “subscriber unit” and “subscriber station,”
 which they agreed should be construed the same. 2 Apple
 proposed the terms mean a “fixed or portable customer
 premises equipment [CPE] that wirelessly receives [up-
 link] bandwidth from a base station, and allocates the
 bandwidth across connected user devices.” J.A. 5. The dis-
 trict court rejected that construction in favor of Wi-LAN’s
 construction: “module that receives [uplink] bandwidth
 from a base station, and allocates the bandwidth across its
 user connections.” J.A. 5–7.
      Apple moved for partial summary judgment of nonin-
 fringement for all accused phones equipped with Intel
 chips based on a 2011 license agreement between Wi-LAN
 and Intel. The parties agreed that the license shielded In-
 tel and its customer Apple from liability pertaining to sales
 of iPhones containing Intel chipsets sold during the license
 term. They disagreed, however, on whether section 3.2 of
 that agreement extended the license in perpetuity. The
 district court granted Apple’s motion, reasoning that this
 section “specifically states that ‘the licenses granted . . .
 shall survive the expiration of the Term License Period.’”
 J.A. 25 (alterations in original); Wi-LAN’s Opening & Re-
 sponse Br. 70.
     Infringement and damages were tried to a jury. At
 trial, Wi-LAN’s damages expert, David Kennedy, applied a
 hypothetical-negotiation framework to compute a royalty
 of $0.85 per phone, or $145.1 million total. J.A. 10617–70.
 He relied largely on the testimony of Dr. Vijay Madisetti

     2  The parties also agreed that the terms should be
 construed consistently across both patents at issue. J.A. 5.
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 APPLE INC.   v. WI-LAN INC.                                 7

 regarding the incremental benefits of the ’145 patent. To
 measure those benefits, Dr. Madisetti tested systems that
 use VoLTE against the best purported noninfringing alter-
 native, Skype. J.A. 10260–61. In particular, Dr. Madisetti
 compared the voice quality of each system and attributed
 the difference to the ’145 patent. J.A. 10261–72. Mr. Ken-
 nedy’s damages theory relied on his testimony.
      The jury found Apple infringed claims 9, 26, and 27 of
 the ’145 patent and claim 1 of the ’757 patent and awarded
 Wi-LAN $145.1 million in damages. J.A. 629–30. Apple
 moved for judgment as a matter of law, renewing its claim
 construction arguments and arguing that Wi-LAN had
 failed to prove infringement even under the district court’s
 construction of subscriber unit. It also moved for a new
 trial on damages or, alternatively, a remittitur.
     The district court denied Apple’s motion for judgment
 as a matter of law and granted its motion for a new trial on
 damages or, alternatively, a remittitur. It determined that
 Dr. Madisetti’s testimony conflated the patented technol-
 ogy with VoLTE generally. J.A. 35–37. Because the inven-
 tors admittedly did not invent VoLTE technology, the
 district court concluded Dr. Madisetti’s testimony lacked a
 factual basis and should not have been presented to the
 jury. J.A. 37. Because Dr. Madisetti’s testimony was es-
 sential to Wi-LAN’s damages theory, the district court of-
 fered Wi-LAN a choice between remittitur to $10 million or
 a new trial on damages. J.A. 38. Wi-LAN chose a new trial.
     In the second damages retrial, Mr. Kennedy pivoted to
 a royalty rate of $0.45 per phone based on three compara-
 ble licenses that covered the asserted patents. J.A. 15216.
 The jury awarded Wi-LAN a royalty rate of $0.45 per phone
 resulting in total damages of $85.23 million. J.A. 756. Ap-
 ple moved for judgment as a matter of law of no damages,
 arguing Mr. Kennedy failed to properly apportion the com-
 parable licenses to reflect the value of the asserted patents.
 J.A. 764–72. The district court denied Apple’s motion. J.A.
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 8                                     APPLE INC.   v. WI-LAN INC.

 62. Apple appeals, and Wi-LAN cross-appeals. We have
 jurisdiction under 28 U.S.C. § 1295(a)(1).
                          DISCUSSION
     Apple argues the district court erred in construing the
 “subscriber unit” and “subscriber station” terms 3 to include
 components of a user device. Apple also argues that there
 is no record evidence that the accused iPhones as sold con-
 tain a subscriber unit because they do not have the re-
 quired user connections.       Lastly, Apple argues that
 Mr. Kennedy failed to apportion for the value of the pa-
 tented technology and, thus, the jury should not have been
 allowed to consider his testimony.
     In its cross-appeal, Wi-LAN argues that the district
 court erred in interpreting the 2011 license agreement be-
 tween Wi-LAN and Intel to grant a perpetual license for
 Intel to sell certain chipsets to Apple. It also argues that
 the district court erred in ordering a new trial on damages
 and asks that we reinstate the original damages verdict.
                               I
      We start with Apple’s challenge to the district court’s
 construction of subscriber unit as a “module that receives
 [uplink] bandwidth from a base station, and allocates the
 bandwidth across its user connections.” We review a dis-
 trict court’s claim construction and its interpretations of in-
 trinsic evidence de novo.          Forest Lab’ys, LLC v.
 Sigmapharm Lab’ys, LLC, 918 F.3d 928, 932–33 (Fed. Cir.
 2019). We review any subsidiary fact findings based on ex-
 trinsic evidence for clear error. Id.
    A claim term is generally given its plain and ordinary
 meaning as understood by a skilled artisan. See Phillips v.
 AWH Corp., 415 F.3d 1303, 1313 (Fed. Cir. 2005) (en banc).

     3    For simplicity, we use the term subscriber unit to
 refer to both subscriber unit and subscriber station.
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 APPLE INC.   v. WI-LAN INC.                                 9

 “We depart from the plain and ordinary meaning of claim
 terms based on the specification in only two instances: lex-
 icography and disavowal.” Hill-Rom Servs., Inc. v. Stryker
 Corp., 755 F.3d 1367, 1371 (Fed. Cir. 2014) (citing Thorner
 v. Sony Computer Ent. Am. LLC, 669 F.3d 1362, 1365 (Fed.
 Cir. 2012)). “To act as its own lexicographer, a patentee
 must clearly set forth a definition of the disputed claim
 term other than its plain and ordinary meaning and must
 clearly express an intent to redefine the term.” Id. (inter-
 nal quotation marks omitted). Embodiments in the speci-
 fication—even if there is only one embodiment—cannot
 limit the scope of the claims absent the patentee’s “words
 or expressions of manifest exclusion or restriction.” Id. at
 1372 (quoting Liebel-Flarsheim Co. v. Medrad, Inc., 358
 F.3d 898, 906 (Fed. Cir. 2004)).
     Rather than rely on the plain-and-ordinary meaning of
 “subscriber unit,” Apple claims the written description re-
 defines that term. It argues the patentee defined “sub-
 scriber unit” as CPE. Apple points to four aspects of the
 intrinsic record that allegedly show this redefinition: first,
 the patents’ interchangeable use of CPE and subscriber
 unit; second, the patents’ use of CPE as the sole embodi-
 ment of the “subscriber unit”; third, the patentee’s prelim-
 inary amendment that replaced claims reciting CPE with
 claims reciting “subscriber unit”; and fourth, the patentee’s
 interchangeable use of subscriber unit with other similar
 terms in related patents. We are not persuaded that the
 record in this case shows that the patentee clearly set forth
 this definition of subscriber unit. 4
    First, the written description does not equate CPE and
 subscriber unit through interchangeable use. It does not

     4   Accordingly, we need not address the second por-
 tion of Apple’s claim construction argument: that CPE ex-
 cludes subcomponents of a user’s device (e.g., part of a
 user’s phone).
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 10                                  APPLE INC.   v. WI-LAN INC.

 use the terms interchangeably at all. The terms are never
 used to describe the same facet of a device or embodiment,
 nor are they used to refer to the same element of a figure.
 Cf. Edwards Lifesciences LLC v. Cook Inc., 582 F.3d 1322,
 1329 (Fed. Cir. 2009) (consistent use of intraluminal graft
 and graft to refer to same object and figure element was
 “akin to a definition equating the two”). Between the two
 patents, they appear in the same sentence only once:
      The broadband wireless communication system fa-
      cilitates two-way communication between a plural-
      ity of base stations and a plurality of fixed
      subscriber stations or Customer Premises Equip-
      ment (CPE).
 ’145 patent at 2:1–4 (emphasis added). And that sentence
 does little to explain the relationship between a subscriber
 station and a CPE because it relates to fixed subscriber sta-
 tions. Even then, it is unclear whether the sentence de-
 scribes fixed subscriber stations and CPEs as alternatives
 or equates the two.
     Nor does the patents’ use of the term CPE in specific
 communication system embodiments and the term sub-
 scriber unit in general communication system descriptions
 show interchangeability. The patents use subscriber unit
 to refer to a generic component of wireless communication
 systems in the related art. For example, they introduce a
 wireless communication system as simply “facilitat[ing]
 two-way communication between a plurality of subscriber
 units (fixed and portable) and a fixed network infrastruc-
 ture.” See ’145 patent at 1:36–40. Moreover, the patents
 explain that prior art systems typically use well-known du-
 plexing schemes such as “time division duplexing (TDD) or
 frequency division duplexing (FDD)” to facilitate the ex-
 change of information “between the base station and the
 subscriber units.” See id. at 1:58–64 (emphasis added).
 Categories of general network transmissions are likewise
 described in terms of subscriber units and base stations.
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 APPLE INC.   v. WI-LAN INC.                                11

 Id. at 1:55–58 (describing downlink and uplink transmis-
 sions).
      Then in each communication system embodiment, the
 patents describe CPEs with specific qualities and features
 communicating with their respective base station. See,
 e.g., ’145 patent at 2:11–15 (describing communication be-
 tween a base station and CPEs “positioned at fixed cus-
 tomer sites 112 throughout the coverage area”); 6:11–16
 (describing CPEs that transmit incremental and aggregate
 bandwidth requests to associated and respective base sta-
 tions). These CPEs match the description of subscriber
 units in the background, but, unlike subscriber units, they
 are never used to describe components common to commu-
 nication systems broadly.
     Thus, the written description merely reveals that a
 CPE is a type of subscriber unit, which Wi-LAN freely ad-
 mits. Wi-LAN’s Opening & Response Br. 34. The fact that
 a CPE is an example of a subscriber unit, however, does not
 show those terms are interchangeable. And there is no ev-
 idence that the patents accord CPE the same scope as sub-
 scriber unit. As such, Apple fails to show the terms are
 interchangeable.
      That brings us to Apple’s second argument: the pa-
 tents’ use of CPE as the sole embodiment of the subscriber
 unit is a redefinition. That argument fails because there
 are no “words or expressions of manifest exclusion or re-
 striction” in the written description. See Hill-Rom, 755
 F.3d at 1372. The patents do not describe the invention as
 limited to a CPE. There is no disclosure that, for example,
 the present invention is, includes, or refers to a CPE. See,
 e.g., Edwards Lifesciences, 582 F.3d 1322 at 1330 (“the
 specification frequently describes an ‘intraluminal graft’ as
 ‘the present invention’ or ‘this invention,’ indicating an in-
 tent to limit the invention to intraluminal devices”). Nor
 are there any statements expressing the advantages, im-
 portance, or essentiality of using a CPE as opposed to a
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 12                                  APPLE INC.   v. WI-LAN INC.

 subscriber unit. See, e.g., Techtronic Indus. Co. v. Int’l
 Trade Comm’n, 944 F.3d 901, 907–10 (Fed. Cir. 2019) (the
 patent’s focus on placement of a detector in the wall console
 as the objective of the invention and improvement over
 prior art garage door operators effected a disavowal of al-
 ternative locations). Nothing in the written description
 makes clear that the invention is limited to a CPE. In fact,
 there is some language suggesting the embodiments are
 not limiting. ’145 patent at 8:65–67, 31:60–63; ’757 patent
 at 2:66–3:2, 17:35–43. Absent such language, we do not
 import limitations from the written description into the
 claims. Hill-Rom, 755 F.3d at 1372–73.
     Apple’s two remaining arguments for equating sub-
 scriber unit and CPE are likewise unpersuasive. Merely
 replacing one claim term with another during prosecution
 does not alone mean the terms are equivalent or inter-
 changeable. Similarly, Wi-LAN does not dispute it used
 different terms for subscriber unit (such as wireless sub-
 scriber unit, subscriber radio unit, and subscriber radio
 station) across its many patents. If anything, that only
 shows subscriber unit is interchangeable with subscriber
 radio station and other, similar terms. It is not evidence
 that CPE and subscriber unit (or any of its variations) are
 interchangeable.
      In sum, our review of the intrinsic record does not sup-
 port Apple’s claim that subscriber unit should be construed
 as CPE. Apple’s claim construction argument, which
 would confine the term to standalone devices, rises and
 falls with that redefinition. We reject Apple’s argument
 and uphold the district court’s construction of subscriber
 unit.
                              II
     Apple next argues that the district court erred in deny-
 ing its motion for judgment as a matter of law that the ac-
 cused products do not infringe. Apple contends that
 substantial evidence does not support the jury’s
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 APPLE INC.   v. WI-LAN INC.                                13

 infringement finding because the iPhones as sold do not
 have a subscriber unit under the district court’s construc-
 tion of that term. Apple’s Opening Br. 42–48. We do not
 agree.
     We review a denial of judgment as a matter of law un-
 der the law of the regional circuit. Godo Kaisha IP Bridge
 1 v. TCL Commc’n Tech. Holdings Ltd., 967 F.3d 1380,
 1382 (Fed. Cir. 2020). The Ninth Circuit reviews such a
 denial de novo. Est. of Diaz v. City of Anaheim, 840 F.3d
 592, 604 (9th Cir. 2016). We review a jury’s infringement
 finding for substantial evidence. Godo Kaisha, 967 F.3d at
 1383. “A factual finding is supported by substantial evi-
 dence if a reasonable jury could have found in favor of the
 prevailing party in light of the evidence presented at trial.”
 Id.
     Substantial evidence supports the jury’s finding that
 the accused iPhones as sold have a subscriber unit. The
 district court construed that limitation to require a “mod-
 ule that . . . allocates the bandwidth across its user connec-
 tions.” J.A. 5–7. At trial, Wi-LAN contended that the
 accused iPhones meet this limitation because each has a
 module that allocates bandwidth across two connections:
 data and VoLTE. Utilizing the graphic below, Dr. Madi-
 setti testified that the baseband processor in the accused
 iPhones has two LTE connections with the application pro-
 cessor: a VoLTE connection (green) and a data connection
 (blue).
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 14                                  APPLE INC.   v. WI-LAN INC.

 J.A. 7561, 10251–52. He further testified that the base-
 band processor’s media access controller (MAC) allocates
 bandwidth across these two connections. J.A. 10253–54.
 More specifically, he testified that the VoLTE connection
 carries voice packets from the application processor’s
 phone application into the baseband processor using an I2S
 bus, where they are stored in a priority queue, and that
 packets from other applications are sent over the data con-
 nection using a PCIE bus and stored in a different queue.
 J.A. 10287–88; Wi-LAN’s Opening & Response Br. 48–49.
 The MAC then reads packets from the queues, in order of
 priority, and transmits them to the base station. J.A.
 10253–54. Finally, Dr. Madisetti testified that the physical
 connections between the baseband processor and applica-
 tion processor (i.e., the I2S bus and PCIE bus) exist “inside
 the iPhone as sold.” J.A. 10253. This testimony provides
 substantial evidence for the jury’s finding that the accused
 iPhones contain a subscriber unit, i.e., a module that allo-
 cates bandwidth across its user connections.
      Apple argues that the data and voice connections do not
 exist in iPhones as sold because those connections are not
 established until the user turns on the phone and connects
 to a network with VoLTE service. Apple’s Opening Br. 44–
 48. And because the phrase “user connections” in the dis-
 trict court’s construction of subscriber unit is structural,
 the iPhones’ capabilities of forming these connections are
 irrelevant. However, substantial evidence supports the
 jury’s contrary finding. As Dr. Madisetti testified, the
 physical I2S bus provides the VoLTE connection between
 the baseband chip and user application, and, likewise, the
 physical PCIE bus provides the data connection between
 the same. J.A. 10253, 10257. And both components exist
 in the iPhone as sold. J.A. 10253.
    Apple attempts to undermine Dr. Madisetti’s testi-
 mony by arguing those physical connections (i.e., I2S bus
 and PCIE bus) do not satisfy the user connections require-
 ment. Citing its expert’s testimony, Apple claims the I2S
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 APPLE INC.   v. WI-LAN INC.                                15

 and PCIE buses stop at the edge of the applications proces-
 sor, meaning the connection would be incomplete. Apple’s
 Response & Reply Br. 21–22 (citing J.A. 11025). The jury,
 however, was free to weigh the testimony of Apple’s expert
 against that of Dr. Madisetti. And we cannot say, in view
 of Dr. Madisetti’s testimony, that the jury’s determination
 was unreasonable.
     Apple further argues the phones must be connected to
 a network to receive parameters to build “the ‘software
 structures’ necessary to establish a connection.” Apple’s
 Opening Br. 46. To the extent that is a separate nonin-
 fringement argument, substantial evidence supports a con-
 trary finding. Dr. Madisetti testified that no modification
 of hardware or software is required to perform the claimed
 allocation. J.A. 10258. And Apple admits that the relevant
 users are the iPhone applications, which run on the appli-
 cations processor. Apple’s Response & Reply Br. 21.
     Accordingly, substantial evidence supports the jury’s
 finding that the accused iPhones contain a subscriber unit
 as sold. Therefore, the district court did not err in denying
 Apple’s motion for judgment as a matter of law on infringe-
 ment.
                               III
     Apple next challenges Mr. Kennedy’s damages method-
 ology in the second trial. We agree that his methodology
 was flawed, and thus, the district court abused its discre-
 tion by denying Apple’s motion for a new trial.
     In Daubert v. Merrell Dow Pharmaceuticals, Inc., 509
 U.S. 579, 589–95 (1993), the Supreme Court set forth the
 standards governing admissibility of expert testimony un-
 der Federal Rules of Evidence 702 and 703. The Court ex-
 plained that the trial judge plays a “gatekeeping role,” id.
 at 597, which “entails a preliminary assessment of whether
 the reasoning or methodology underlying the testimony is
 scientifically valid and of whether that reasoning or
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 16                                  APPLE INC.   v. WI-LAN INC.

 methodology properly can be applied to the facts in issue,”
 id. at 592–93. The Court emphasized that the focus “must
 be solely on principles and methodology, not on the conclu-
 sions that they generate.” Id. at 595. “[A] reasonable or
 scientifically valid methodology is nonetheless unreliable
 where the data used is not sufficiently tied to the facts of
 the case.” Summit 6, LLC v. Samsung Elecs. Co., Ltd., 802
 F.3d 1283, 1296 (Fed. Cir. 2015). Likewise, “ideal input
 data cannot save a methodology that is plagued by logical
 deficiencies or is otherwise unreasonable.” Id. But where
 the methodology is reasonable and its data or evidence are
 sufficiently tied to the facts of the case, the gatekeeping
 role of the court is satisfied. Id.
     At trial, Wi-LAN used the hypothetical negotiation ap-
 proach for calculating reasonable royalty damages under
 35 U.S.C. § 284. This approach attempts to calculate the
 royalty rate the parties would have agreed upon had they
 negotiated an agreement prior to the start of the infringe-
 ment. In determining a reasonable royalty, “parties fre-
 quently rely on comparable license agreements.” Bio-Rad
 Labs, Inc. v. 10X Genomics Inc., 967 F.3d 1353, 1372 (Fed.
 Cir. 2020). When relying on comparable licenses to prove
 a reasonable royalty, we require a party to “account for dif-
 ferences in the technologies and economic circumstances of
 the contracting parties.” VirnetX, Inc. v. Cisco Sys., Inc.,
 767 F.3d 1308, 1330 (Fed. Cir. 2014) (citation omitted). We
 review a district court’s decision concerning the methodol-
 ogy for calculating damages for an abuse of discretion. Lu-
 cent Techs., Inc. v. Gateway, Inc., 580 F.3d 1301, 1310 (Fed.
 Cir. 2009). We review a denial of judgment as a matter of
 law and the denial of a motion for a new trial under the law
 of the regional circuit. Id. at 1309. In the Ninth Circuit,
 denial of a motion for a new trial is reviewed for abuse of
 discretion. Smith v. City & Cnty. of Honolulu, 887 F.3d
 944, 949 (9th Cir. 2018).
    To estimate a reasonable royalty in this case, Mr. Ken-
 nedy first culled more than 150 Wi-LAN license
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 agreements down to three comparable agreements 5: the
 Vertu, Doro, and Unnecto license agreements. He chose
 those three licenses because they (1) involved phones as
 the licensed products; (2) became effective in 2013 or later;
 (3) licensed patents covering LTE or related technology;
 and (4) were executed after the asserted patents issued.
 J.A. 15220–23. In addition to licensing patents covering
 LTE, each agreement also licensed other patents in Wi-
 LAN’s portfolio.
     Mr. Kennedy then set out to adjust for the differences
 between those licenses and the license that would have re-
 sulted from the hypothetical negotiation. He acknowl-
 edged that—unlike the Vertu, Doro, and Unnecto portfolio
 licenses—the hypothetical negotiation would have resulted
 in a license to only the ’145 and ’757 patents. J.A. 15231–
 32.
     To account for this difference, Mr. Kennedy first sought
 to establish that, in practice, only a handful of valuable pa-
 tents drive the royalty rate for a license, and the rest of the
 portfolio is included for a marginal upcharge. J.A. 15233–
 34. For example, he testified:
     I’ve done many deals working for both sides of the
     table. Both parties understand and expect that the
     rest of the portfolio will be included, maybe for
     some upcharge. But it’s not dividing the patents by
     numbers and multiplying it by, you know, a thou-
     sand patents. It just doesn’t work that way.

     5    Sufficient comparability is a threshold require-
 ment for licenses to be admissible. Elbit Sys. Land & C4I
 Ltd. v. Hughes Network Sys., LLC, 927 F.3d 1292, 1299
 (Fed. Cir. 2019). And Apple admits that the running-roy-
 alty licenses Mr. Kennedy relied on were admissible. Oral
 Arg. at 5:36–5:43, https://oralarguments.cafc.uscourts.gov
 /default.aspx?fl=202011_10082021.mp3.
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 18                                   APPLE INC.   v. WI-LAN INC.

      ...
      You can cut out portions of the patent portfolio an-
      yway as, Mr. Skippen testified, that just don’t re-
      late, or if they’re Bluetooth, they’re already
      licensed, so Wi-LAN is thinking, I can’t collect
      again. So that number is not really a thousand.
      But whatever the number is, you’re bringing forth
      your most valuable ones and that sets the price.
 J.A. 15232–33. Mr. Skippen, on whom Mr. Kennedy relied,
 likewise testified that, in the industry, parties focus on a
 handful of “key patents,” “like throwing in the chaff with
 the wheat,” to provide the licensee respite and increase the
 royalty amount somewhere between 5 and 35 percent on
 average. J.A. 15157–58.
     Mr. Kennedy, relying in part on Mr. Skippen’s testi-
 mony, determined that the ’145 and ’757 patents were key
 patents in the three licenses for three reasons: they were
 specifically listed in the comparable licenses, they were dis-
 cussed in negotiations, and Apple continued to use the
 technology after the patents were asserted against them,
 rather than switch to a noninfringing alternative. J.A.
 15236–38; see also Wi-LAN Opening & Response Br. 57
 (“the ’145 and ’757 patents were ‘crown jewels’, ‘key pa-
 tents’ that phone makers like Doro ‘focus[ed] on’ in negoti-
 ations”), 60 (“the ’145 and ’757 patents . . . came up in
 negotiations, and were expressly named in the Doro and
 Vertu licenses”). For example, when asked about how he
 determined that others value the patented technology as
 important, Mr. Kennedy referenced Mr. Skippen’s testi-
 mony that Doro “reupped [its] license in 2018, specifically
 talking about how these two patents . . . had been found
 valid and infringed.” J.A. 15237. He then pointed out that
 the Vertu license listed one of the asserted patents, and
 that the Unnecto license listed both asserted patents. J.A.
 15237–38. Mr. Kennedy also emphasized that Apple’s con-
 tinued use of the patented technology after being found to
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 APPLE INC.   v. WI-LAN INC.                                19

 infringe “tells you it’s valuable to Apple or they would just
 take it out.” J.A. 15236–37. Based on these facts, Mr. Ken-
 nedy treated the asserted patents as the key patents. To
 separate the value of the key patents from the rest of the
 licensed portfolio, he reduced the royalty rate by 25 per-
 cent. J.A. 15238. He selected this rate based on Mr. Skip-
 pen’s testimony that, in practice, the rest of a portfolio was
 licensed for a 5 to 35 percent markup. See J.A. 15158.
     Mr. Kennedy’s opinion that the asserted patents were
 key patents is untethered to the facts of this case. As a
 preliminary matter, all three licenses were obtained prior
 to any litigation. J.A. 15240–41. Thus, unlike Apple, the
 licensees did not continue to use the technology after being
 found to infringe. More importantly, those licenses treated
 the asserted patents as chaff, not wheat. For example,
 there is no evidence that the ’757 patent was discussed dur-
 ing negotiations for any of the comparable licenses. 6 Each
 license divided the licensed patents between two catego-
 ries: Asserted Patents and Non-Asserted Patents. None of
 the licenses list the ’757 patent among the “Asserted Pa-
 tents,” which were the patents focused on during underly-
 ing negotiations. J.A. 861, 885, 923, 935. Two of the
 licenses, Doro and Vertu, do not list the ’757 patent at all.
 And Unnecto’s reference to the ’757 patent is easily lost in
 a schedule listing hundreds of Non-Asserted patents. J.A.
 886, 900–22. And Mr. Skippen also expressly testified that
 the ’757 patent was not discussed in initial negotiations of
 the Doro license agreement. J.A. 15163. There is no record
 evidence supporting Mr. Kennedy’s assumption that the
 ’757 patent was a key patent. Accordingly, Mr. Kennedy’s
 conclusion that the ’757 patent falls into the key patent

     6    Mr. Kennedy’s justification that the ’757 patent
 was later discussed in 2018 during renegotiations is imma-
 terial because, as he acknowledged, the relevant timeframe
 for the hypothetical negotiation was 2013. See J.A. 15222.
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 20                                  APPLE INC.   v. WI-LAN INC.

 category because it was identified as such in the compara-
 ble licenses is inconsistent with the available facts. None
 of the three license agreements treats the ’757 patent as a
 key patent, and no testimony on negotiations suggested the
 contrary.
      For similar reasons, the record does not support that
 the Doro or Unnecto licenses treated the ’145 patent as a
 key patent. Neither lists the ’145 patent as one of the “As-
 serted Patents.” Doro doesn’t list it at all, and as with the
 ’757 patent, Unnecto lists the ’145 patent with hundreds of
 other patents in the chaff. There is also no evidence that
 the ’145 patent was discussed in negotiations for either
 agreement. Mr. Skippen expressly testified that the ’145
 patent was not discussed in negotiations of the Doro license
 agreement. J.A. 15163. There is, therefore, no basis upon
 which to conclude based upon the evidence presented that
 either the Doro or Unnecto license is a meaningful proxy
 for the royalty rate of the ’145 patent.
     That just leaves the Vertu license’s treatment of the
 ’145 patent. Mr. Skippen testified that the ’145 patent was
 discussed during the Vertu license negotiations. J.A.
 15166. And that license lists the ’145 patent as one of the
 “Asserted Patents.” J.A. 923, 935. However, it also lists
 five other “Asserted Patents.” Id. And Mr. Kennedy failed
 to address the extent to which these other patents contrib-
 uted to the royalty rate in the Vertu license. Yet he opined
 that excluding these patents (and the rest of Wi-LAN’s
 portfolio) from the hypothetical negotiation would have
 netted Apple only a 25 percent discount. Mr. Kennedy’s
 silence on these equally situated patents is troubling and
 makes his opinion unreliable.
     Mr. Kennedy’s methodological and factual errors in an-
 alyzing the comparable license agreements render his opin-
 ion untethered to the facts of this case. Thus, Mr.
 Kennedy’s damages testimony should have been excluded.
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 APPLE INC.   v. WI-LAN INC.                                     21

 We conclude the district court abused its discretion in
 denying Apple’s motion for a new trial on damages.
                                IV
     Turning to Wi-LAN’s cross-appeal, the district court
 held that section 3.2 of the license agreement between Wi-
 LAN and Intel unambiguously provided Intel a perpetual
 license to the asserted patents. J.A. 24–25. Accordingly, it
 granted Apple’s motion for summary judgment of no in-
 fringement for all iPhones supplied with Intel chipsets af-
 ter the license agreement term expired. J.A. 25. Section
 3.2 recites in part:
     3.2 Term License for Wi-LAN Patent Portfolio. For
     the Term License Period, Wi-LAN . . . grants to In-
     tel . . . a worldwide . . . license, without the right to
     sublicense, under the Licensed Patents to directly
     or indirectly engage in Licensed Activities. For
     clarity, . . . the licenses granted pursuant to this
     Section 3.2 with respect to Licensed Activities that
     were actually engaged in during the Term License
     Period shall survive the expiration of the Term Li-
     cense Period . . . .
 J.A. 5432. Wi-LAN argues that this section does not pro-
 vide a perpetual license for chipsets Intel sold after the
 agreement expired. We agree.
     We review a district court’s grant of summary judg-
 ment under the law of the regional circuit, here, the Ninth
 Circuit. Edgewell Pers. Care Brands, LLC v. Munchkin,
 Inc., 998 F.3d 917, 919 (Fed. Cir. 2021). The Ninth Circuit
 reviews a district court’s grant of summary judgment de
 novo. Greater Yellowstone Coal. v. Lewis, 628 F.3d 1143,
 1148 (9th Cir. 2010). The relevant license agreement be-
 tween Wi-LAN and Intel is governed by Delaware law. J.A.
 5433. Under Delaware law, contract interpretation is a
 question of law that we review de novo. GMG Cap. Invs.,
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 22                                  APPLE INC.   v. WI-LAN INC.

 LLC v. Athenian Venture Partners I, L.P., 36 A.3d 776, 779
 (Del. 2012).
      Contracts must be “read as a whole, giving meaning to
 each term, and avoiding an interpretation that would ren-
 der any term ‘mere surplusage.’” Sunline Com. Carriers,
 Inc. v. CITGO Petroleum Corp., 206 A.3d 836, 846 (Del.
 2019). When the contract language is clear and unambig-
 uous, “the parties’ intent is ascertained by giving the lan-
 guage its ordinary and usual meaning.” Nw. Nat’l. Ins. Co.
 v. Esmark, Inc., 672 A.2d 41, 43 (Del. 1996). A contract is
 not ambiguous merely because the parties disagree as to
 its proper interpretation. Id. “Rather, a contract is ambig-
 uous only when the provisions in controversy are reasona-
 bly or fairly susceptible to different interpretations or may
 have two or more different meanings.” Id. (citation omit-
 ted).
      Section 3.2 of the license agreement unambiguously
 grants a term license. In the first sentence, Wi-LAN grants
 Intel a worldwide license to engage in Licensed Activities
 only “for the Term License Period,” which expired January
 21, 2017. J.A. 5429, 5431–32. The introductory phrase of
 the next sentence explains the purpose of the sentence:
 “[f]or clarity.” J.A. 5432. The sentence goes on to clarify
 that “(i) the licenses granted . . . with respect to the Li-
 censed Activities that were actually engaged in during the
 Term License Period shall survive the expiration of the
 Term License Period.” J.A. 5432. Thus, Intel continues to
 enjoy protection for Licensed Activities, such as past sales,
 engaged in prior to the license’s expiration. Our review of
 section 3.2 reveals no intent of the parties to extend the
 term license in perpetuity to Licensed Activities occurring
 after the license’s expiration.
     Apple disagrees and argues the plain meaning of the
 second sentence provides a perpetual license for any future
 Licensed Activities of the type it actually engaged in during
 the license term, including sales of Intel chipsets to Apple.
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 APPLE INC.   v. WI-LAN INC.                                23

 Apple’s Response & Reply Br. 65–67. Under Apple’s inter-
 pretation, the second sentence contradicts the first sen-
 tence by extending the term of the license, which goes
 against the express purpose of that sentence: clarity.
 Moreover, Apple’s interpretation inserts uncertainty into
 the agreement by granting perpetual licenses for unspeci-
 fied categories of Licensed Activities, the scope of which
 could not be determined until the expiration of the agree-
 ment. This is particularly suspect given the preceding sen-
 tence unambiguously grants a license of a limited duration.
 Apple’s interpretation is not reasonable. Because section
 3.2 unambiguously grants Intel a limited license that does
 not extend to Licensed Activities occurring after the expi-
 ration of the agreement, we reverse the district court’s
 grant of summary judgment of no infringement.
                               V
     Wi-LAN next argues the district court abused its dis-
 cretion in granting a new trial on damages because
 Dr. Madisetti’s testimony about the benefits of the pa-
 tented invention should not have been presented to the
 jury. 7 We do not agree.
     We review a district court’s grant of a motion for a new
 trial under the law of the regional circuit. Ericsson, Inc. v.
 D-Link Sys., Inc., 773 F.3d 1201, 1225 (Fed. Cir. 2014). The
 Ninth Circuit reviews such a grant for abuse of discretion.
 Dees v. Cty. of San Diego, 960 F.3d 1145, 1151 (9th Cir.
 2020). Evidentiary rulings are also reviewed for an abuse
 of discretion. Crowley v. Epicept Corp., 883 F.3d 739, 752
 (9th Cir. 2018). We “must uphold the district court if any

     7   Because Wi-LAN agrees that its challenge rises
 and falls with the district court’s decision regarding
 Dr. Madisetti’s testimony, we need not address its chal-
 lenge to the admissibility of other evidence. Wi-LAN’s Re-
 ply Br. 19.
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 24                                    APPLE INC.   v. WI-LAN INC.

 of its grounds for granting a new trial are reasonable.”
 Dees, 960 F.3d at 1151 (citation omitted).
      We see no reversible error in the district court’s reason-
 ing. The district court focused on Dr. Madisetti’s testimony
 about the incremental benefits of the patented technolo-
 gies, which formed the basis of Wi-LAN’s damages theory.
 J.A. 34–35. And it determined that Dr. Madisetti conflated
 the benefits of the patented technologies with VoLTE gen-
 erally based on three facets of his testimony. First,
 Dr. Madisetti used VoLTE as a starting point to determine
 the benefits of the patented invention, despite an admis-
 sion that the inventors of the patented technology did not
 invent VoLTE. J.A. 35. Second, Dr. Madisetti primarily
 relied on testing comparing the voice call quality of VoLTE
 with Skype, a purported noninfringing alternative that did
 not utilize VoLTE technology, and attributed the difference
 to the benefit of the asserted patents. J.A. 36. Lastly, Wi-
 LAN’s line of questioning connected VoLTE generally with
 the benefits of the asserted patents. J.A. 36–37. The dis-
 trict court cited trial testimony throughout its analysis.
 Because the inventors of the patented technology admit-
 tedly did not invent VoLTE, Dr. Madisetti’s testimony con-
 flating the patented technologies with VoLTE lacked a
 factual basis and should not have been presented to the
 jury. J.A. 37. Moreover, Dr. Madisetti’s testimony was the
 basis for Wi-LAN’s damages theory. Thus, the district
 court did not abuse its discretion in granting Apple’s mo-
 tion for a new trial on damages.
     Wi-LAN argues Dr. Madisetti did not conflate VoLTE
 with the invention of the ’145 patent because it compared
 VoLTE and Skype call quality under multitasking or load-
 ing conditions (i.e., with multiple applications using the
 phone’s network connection). Wi-LAN’s Opening & Re-
 sponse Br. 78–80. And improved voice quality during load-
 ing is the benefit the patented technology provided.
 Dr. Madisetti certainly did testify concerning background
 applications running on the phone during testing. See, e.g.,
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 APPLE INC.   v. WI-LAN INC.                                 25

 J.A. 10265. However, Dr. Madisetti made much broader
 statements about the value of the patented technology in
 his testimony, which the district court relied on in its anal-
 ysis. For example, counsel for Wi-LAN engaged in the fol-
 lowing exchange with Dr. Madisetti:
     Q: Apple’s use of these three inventions in the pa-
     tent claims in the accused iPhones, do they improve
     the iPhone as a whole for voice and cellular data?
     A: Yes.
     Q: Better voice and higher speeds?
     A: Yes.
 J.A. 10271–72. Counsel also asked Dr. Madisetti:
     Q: . . . You provided your expert opinion as to the
     benefit that Apple realizes by inclusion of these pa-
     tents in the iPhone; is that correct?
     A: Yes. . . .
     Q: At a high level, what are those benefits?
     A: You get great quality from the VoLTE, that is
     2.3 MOS better. . . .
 J.A. 10385–86. Our review on this issue is highly deferen-
 tial, and the trial judge is in the best position to evaluate
 trial proceedings. Given the breadth of certain portions of
 Dr. Madisetti’s testimony, we see no abuse of discretion in
 the district court’s analysis.
                           CONCLUSION
     For the above reasons, we uphold the district court’s
 claim construction of the subscriber unit term, affirm its
 denial of judgment as a matter of law of noninfringement,
 reverse its partial summary judgment of no infringement
 with respect to iPhones with Intel chips, affirm its grant of
 a new damages trial after the first trial, vacate its denial
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 26                                APPLE INC.   v. WI-LAN INC.

 of a new damages trial after the second trial, and remand
 for a new trial on damages consistent with this opinion.
      AFFIRMED-IN-PART, REVERSED-IN-PART,
        VACATED-IN-PART, AND REMANDED
                          COSTS
 No costs.