# United States **Court of Appeals**  **for the Federal Circuit**

______________________ SOUND VIEW INNOVATIONS, LLC, Plaintiff

- Appellant

v.
HULU, LLC, Defendant

- Appellee

______________________
2021

- 1998

______________________ Appeal from the United States District Court for the Central District of California in No. 2:17

- cv

- 04146

- JAK

PLA, Judge John A. Kronstadt.

______________________
Decided: May 11, 2022

______________________
A LAN K ELLMAN , Desmarais LLP, New York, NY, argued for plaintiff

- appellant. Also represented by F REDERICK D ING ; P ETER C URTIS M AGIC , San Francisco, CA.

B RETT J OHNSTON W ILLIAMSON , O'Melveny & Myers LLP, Newport Beach, CA, argued for defendant

- appell ee. Also represented by B RADLEY M. B ERG , J OHN C. K APPOS , B O M OON , C AMERON W ILLIAM W ESTIN ; P ATRICK N ACK

L EHMAN , Menlo Park, CA.

______________________
Before P ROST , M AYER , and T ARANTO , Circuit Judges

. Case: 21-1998 Document: 45 Page: 1 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 2

T ARANTO , Circuit Judge

. Sound View Innovations, LLC owns now

- expired U.S.Patent No. 6,708,213, titled “Method for Streaming Multimedia Information over Public Networks.” When SoundView brought the present case against Hulu, LLC, it alleged infringement of six Sound View patent s, but only claim 16 of the ’213 patent remains at issue. Sound View alleges that Hulu infringed claim 16 by its use of (third party) edge servers
, which sit between a central Hulu content server and the video

- playing devices of end

- user customers (client s) . Most significantly for purposes of the infringement dispute currently before us
, Sound View alleges that, under Hulu’s direction, when an edge server receives a client request for a video not already fully in the edge server’s possession, and obtains segments of the video seriatim from the content server (or an other edge server), the edge server t ransmit s to the Hulu client a segment it has obtained while concurrently retrieving a remaining segment. Claim 16 specifies a method, involving a content serv er and intermediate servers (helper servers), to use when a client requests a streaming multimedia (SM) object. One limitation requires “allocating a buffer” at a helper server

“ to cache ” at least a portion of the SM object. The next limitation (the “downloading/retrieving limitation”) requires sending that portion to a requesting client while concurrently retrieving a remaining portion of the SM object from the content server or another helper server

. In the first ruling before us, the district court construed th e downloading/retrieving limitation not to cover a process in which the downloading occurs from one buffer in the helper server and the (concurrent) retrieving places what is retrieved in another buffer in that server. Rather, the court construed the limitation to require that the same buffer in the helper

server— the one allocated in the preceding step

— host both the portion sent to the client and a remaining portion retrieved concurrently from the content server or other Case: 21-1998 Document: 45 Page: 2 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 3

helper server. Sound View Innovations, LLC v. Hulu, LLC
, No. LA CV17

- 04146, 2020 WL 10758103 , at *5 (C.D. Cal

. Apr. 13, 2020) ( Claim Construction Opinion ). With that claim construction in hand, Hulu sought

summar y judgment of non

- infringement of claim 16 , arguing that it was undisputed that , in the edge servers of its content delivery networks , no single buffer hosts both the video portion downloaded to the client and the retrieved additional portion. Sound View argu ed, in response, that the re remained a factual dispute about whether “caches” in the edge servers met the concurrency limitation as construed. T he district court held, however, that a “ cache ” could not be the “buffer” that its construction of the downloading/retrieving limitation requir ed, and on that basis, it granted summary judgment of non

- infringement. Sound View Innovations, LLC v. Hulu, LLC , No. LA CV17

- 04146, 2020 WL 6821317, at *6 (C.D. Cal

. Oct. 20, 2020) ( Summary Judgment O pinion ). A f inal judgment follow ed. Sound View appeals . It challenges the claim construction and the summary judgment ruling . It also challenges two interlocutory rulings that exclude d, under Federal Rule of Evidence 702, portions of Sound View’s expert testimony on reasonable- royalty damages

. Sound View Innovations, LLC v. Hulu, LLC , No. LA CV17

- 04146, 2019 WL 9047211, at *9

– 11 (C.D. Cal. Nov. 18, 2019) ( Damages O

pinion I ); Order R e Defendant’s Supplemental Motion to Exclude Testimon y of Mr. David Yurkerwich
, Sound View Innovations , LLC v. Hulu, LLC , No. LA CV17

- 04146 (C.D. Cal. June 18, 2020), ECF No. 8 40 (Damages Opinion II ).
We affirm the district court’s construction of the downloading / retrieving limitation

. But we reject the d istrict court’s determination that “buffer” cannot cover “a cache ,” and we therefore vacate the district court’s grant of summary judgment and remand for further proceedings. Because the evidentiary rulings could matter on remand, we address those rulings

— which we affirm. Case: 21-1998 Document: 45 Page: 3 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 4

I
A The ’213 patent describes and claims “methods which improve the caching of streaming multimedia data (e.g.,audio and video data) from a content provider over a network to a client ’ s computer.” ’213 patent, col. 1, lines 10

– 15. The method s use “help er servers (HS)

. . . which op erate as caching and streaming agents

. ” I d. , col. 2, lines 64

– 67

. Delay in content delivery, server load, and network load can be reduced by using helper servers to respond to client requests. I d. , col. 5, lines 46

– 50. In described embodiments
, the inv ention “utilizes ring buffers in the
memory of the HS

. ” Id. , col. 5, lines 55

– 57

. When a helper

server receives a request for a streaming media (SM) object, and it does not already have the object, it requests the object from, e.g. , the content server, which starts streaming it to the HS. Id. , col. 6, lines 4 2– 46

. The HS “allocates a ring buffer in memory,” id.
, col. 6, line 54, which “is filled with data” from, e.g. , the content server, id.
, col. 6, lines 48

– 51. “The ring buffer s represent a type of short term storage to service multiple requests for the same object which occur within a certain time range.” Id. , col. 5, lines 57

– 60. Referring to a ring buffer 57 of F igure 5A, the patent states that “the ring buffer 57 operates as a type of short term cache which stores a portion of an SM object for

a fixed time interval,” and
, because it is emptied out by sending data to a client and replenished with more data, “[i]t is also convenient to view the ring buffer 57 as a sliding win dow in the sense that portions of an SM object are initially cached in the ring buffer 57 and then deleted to store successive portions of the SM object.” Id. , col. 7, lines 20

– 2 6. Claim 16 of the ’213 patent recites:

16. A method of reducing latency in a network having a content server which hosts streaming media (SM) objects which comprise a plurality of time

Case: 21-1998 Document: 45 Page: 4 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 5

ordered segments for distribution over said network through a plurality of helpers (HSs) to a plurality of clients, said method comprising:
receiv ing a request for an SM object from one of said plurality of clients at one of said plurality of helper servers; allocating a buffer at one of said pluralityof HSs to cache at least a portion of said requested SM object; downloading said portion of said r equested SM object to said requesting client, whileconcurrently retrieving a remaining portion of said requested SM object from one of another HS and said content server; and adjusting a data transfer rate at said one of said plurality of HSs for transfer ring data from said one of said plurality of helperservers to said one of said plurality of clients.
Id. , col. 14, lines 31

– 48.
B In June 2017, Sound View sued Hulu for infringement of claims of six patents, based on Hulu’s Streaming Video on Demand products, which use the edge servers of content delivery networks
, including third parties Akamai and Level 3, to deliver content to clients. J. A

. 203; J.A. 221

– 37. As to claim 16 of the ’213 patent, Sound View argued that Hulu directed or controlled the content delivery network s to allocate a local buffer at an edge server (the claimed “helpe r server”) to cache at least a portion of a Hulu video and to download that video portion to a client while concurrently pre

- fetching ( i.e. , retrieving) another portion of the video. Case: 21-1998 Document: 45 Page: 5 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 6

1
The district court initially construed several claim terms, but t h e ini tial constructions are not disputed in this appeal. As the case proceeded, it became clear that the parties disputed the meaning of the downloading/retrieving limitation of claim 16 . The district court’s resolution of the dispute is on appeal to us.
Soun d View argued that the limitation should be construed according to the ordinary meaning of its words, which do not include “buffer” and, more particularly, do not require that the concurrent sending out (downloading) and receiving (retrieving) involve the same buffer

. Hulu argued that the concurrent

- function requirement must involve the same buffer , and it relied centrally (though not solely) on the prosecution history to support that construction. During prosecution, the applicants added the entire downloading/retrieving limitation to original claim 16 to overcome a rejection over DeMoney (U.S. Patent No. 6,438,630). The district court agreed with Hulu that the applicants’ statements accompanying the amendment disclaimed the full scope of the downloading/retrieving limitation, and that the claim required the concurrent downloading from and filling of a single buffer

. Claim Construction Opinion , 2020 WL 10758103 , at *3

– 4. It thus construed the downloading/retrieving limitation as “downloading said portion of said requested SM object from said allocated buffer to said requesting client, while concurrently retrieving into the same buffer a remaining portion of said requested SM object from one of another HS and said content server.” Id. at *5 ( emphas e s added)

. Sound View subsequently sought reconsideration of that decisio n, but the court denied the reconsideration motion

. Sound View Innovations, LLC v. Hulu, LLC , No. LA CV17

- 04146, 2020 WL 5356698, at *5 (C.D. Cal. June 18, 2020).
Hulu eventua lly sought summary judgment of non

- infringement , arguing that it could not infringe claim 16 Case: 21-1998 Document: 45 Page: 6 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 7

because it was undisputed that the accused edge servers

—the edge servers Sound View identified as the “helper servers” for its infringement charge

— do not download and retrieve subsequent portions of the same SM object in the same buffer
, so there could be no infringement in light of the court’s “same

- buffer” c laim

- construction decision

. J.A. 3583

– 89. Sound View argued that there was a factual dispute as to whether certain caches in the accused edge servers satisf ied the requirements of claim 16. J. A

. 3742

– 50

. T he district court agreed with Hulu and granted it summary judgment of non

- infringement of claim 16. Summary Judgment Opinion

, 2020 WL 6821317, at *6. The court determined that the ’213 patent uses the term s “buffer” and “cache” to refer to distinct physical components and , therefore , a cache could no t satisfy the limitation of claim 16 requiring a buffer

. Id. at * 3–6. I t determined that no further construction of “buffer” was ne cessary

. Id. at *6 n.1.

2The district court issued two rulings related to damages that are on appeal along with the claim

- construction and summary

- judgment rulings. Sound View proposed to have David Yurkerwich testify to what amount would constitute a reasonable royalty if infrin gement were found

. Mr. Yurkerwich sought to show the value of the invention to a video

- streaming provider based on the improved user experience if the invention were used
, including fewer occasions of stall ing of the video on the user’s device (“rebufferi ng events,” J.A. 2288) to await arrival of successive portions for display

. Mr . Yurkerwich’s first damages opinion, J.A. 2819

– 25 , relied in part on a study titled “Empirical Evaluation of HTTP Adaptive Streaming under Vehicular Mobility” by Yao et al. (the Yao study), which considered (through emulation) the experience of vehicle passengers in Sydney, Australia
, watching streaming videos received on mobile device s over a Wireless Wide Area Network connection, Case: 21-1998 Document: 45 Page: 7 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 8

J .A

. 3175

– 78. According to Mr. Yurkerwich
, the Yao study concluded that so

- called “adaptive streaming ” reduced the number of stalling occasions by 80%, and because the ’213 patent teaches adaptive streaming (among other things)
, there would be an 80% decrease in stalling occasions if th e patented technology were used. J.A. 2825. 1 Hulu movedto preclude Mr. Yurkerwich from presenting damages calculations that relied on the Yao study. The district court granted the motion, explaining that Mr. Yurkerwich did not present a sufficient bas is to rely on the Yao study, as he did not account for the differences between the adaptive bit rate streaming that was the subject of the Yao study and Hulu’s alleged use of adaptive streaming , since many of Hulu’s U.S. customers use stationary devices an d a WiFi or wired connection. Damages Opinion I

, 2019 WL 9047211, at *9

– 11.
Mr. Yurkerwich subsequently submitted an amended report, J. A. 4446

– 4529, which removed references to theYao study and instead relied on a press release by a company called Conviv a

. But the amended report itself presented an evidentiary problem. The Conviva press release

1 The Abstract of Yao characterizes “adaptive streaming” in a way that corresponds , not to the downloading/retrieving limitation (as construed to require same

buffer concurrency), but to the last limitation of claim 16
, which calls for “adjusting a transfer rate .” See J.A. 3175(“Adaptive streaming is a promising technique for delivering a high

- qua lity video streaming experience. In this technique, the streaming bit

- rate is constantly adjusted in accordance with variations in the underlying network bandwidth conditions.”) ; see also Sound View’s Opening Br. at 17 (“ [A] daptive bitrate streaming (ABR) [is] a key part of the infringing feature” (emphasis added) ) ; id. at 53(“Hulu’s systems use ABR and are designed to change bitrates based on available bandwidth

. ”)

. Case: 21-1998 Document: 45 Page: 8 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 9

described a study of 22 .6 billion video streams from viewers in 190 countries and asserted that users with an optimal streaming experience with startup time, sta lling , and bit rate watched 250% more content

. J. A. 3326

– 28

. Mr. Yurkerwich noted that a Hulu

- commissioned study estimated that users of streaming systems with adaptive bit rate technology watched an even greater percentage of additional content, J.A. 4524, but explained that he used the lower figure from Conviva in his calculations so that hi s estimate would be “conservative[]
, ” i d. When Hulu moved to exclude the amended report , t he district court grantedthe motion because Mr. Yurkerwich never saw the underlying study in the Conviva report and thus could not assessthe methodology or even determine what streaming services were studied, and because he did not demonstratethat all of the identified benefits of the study were attributable to the patented invention or consider whether apportionment was warranted. Damages Opinion II , at 4 –5. The district court struck Mr. Yurkerwich’s amended report and directed the parties to meet to confer about whether the aspects of Mr. Yurkerwich’s original report that did not rely on the Yao study could support a claim for damages. Damages Opinion II , at 5 –6.
3 After the parties stipulated to dismissal of the remaining claims and counterclaims
, 2 the district court issued a final judgment of non

- infringement of claim 16 of the ’213 patent. J. A

. 2. It also dismissed Hulu’s counterclaim for invalidity of cla im 16 without prejudice. Id. Sound View

2 The asserted claims regarding four of the patents, along with infringement and invalidity allegations concerning other claims of the ’213 patent, were dismissed at various points in the litigation. The court held invalid all asserted claims of another ass erted patent, and Sound View has not appealed that decision. Case: 21-1998 Document: 45 Page: 9 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 10

timely appealed. We have jurisdiction over the district court’s final judgment under 28 U.S.C. § 1295(a)(1).
II
We review de novo the claim

- con struction ruling concerning the downloading/retrieving limitation , a s the ruling rests only on intrinsic evidence

. Intel Corp. v. Qualcomm Inc. , 21 F.4th 801, 8 08 (Fed. Cir. 2021)

. “ We generally give words of a claim their ordinary meaning in the context of the claim and the whole pate nt document;the specification particularly, but also the prosecution history, informs the determination of claim meaning in context, including by resolving ambiguities; and even if themeaning is plain on the face of the claim language, the patentee can, by acting with sufficient clarity, disclaim such a plain meaning or prescribe a special definition.” World Class Tech nology Corp. v. Ormco Corp. , 769 F.3d 1120, 1123 (Fed. Cir. 2014) ( citing Phillips v. AWH Corp. , 415 F.3d 1303, 1312

– 17 (Fed. Cir. 2005) (en banc), and Thorner v. Sony Computer Entertainment America LLC , 669 F.3d 1362, 1 365 (Fed. Cir. 2012) ) ; see also Personalized Media Communications, LLC v. Apple Inc. , 952 F.3d 1336, 1340 (Fed. Cir. 2020) (“ [A] n applicant’s amendment accompanied by explanatory remarks can define a claim term bydemonstrating what the applicant meant by the amendment

. ”)

. Here, we conclude, as the district court did, thatthe prosecution history establishes that the downloading/retrieving limitation must be construed to require the downloading and retrieving actions to involve the same buffer. Before discussing the prose cution history
, we note that this is not a case in which the other intrinsic evidence

— the claim language and specification

— establish a truly plain

mean ing contrary to the meaning assertedly established by the prosecution history. The downloading/retrieving limitation , which does not expressly refer to “buffers,” contains no words affirmatively making clear that different buffers Case: 21-1998 Document: 45 Page: 10 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 11

in the helper server may be used for the sending out to clients of one portion of the SM object and the receiving of a retrieved remaining portion

. I n its opening phrase, “downloading said portion of said requested SM object to said requesting client ,” ’213 patent, col. 14, line s 41

– 42 (emphasis added)
, the limitation refers indirectly to “a buffer” via the preceding limitation’s requirement of “allocating a buffer

. . . to cache at least a portion ” of the SM objec t , id.
, col. 14, lines 39

– 40 . In this claim
, in which care is taken to use “a plurality of” when more than the singular is meant, “allocating a buffer” reasonably suggests allocating a single buffer. The next phrase, “while concurrently retrieving a remaining portion” of the same requested SM objec t, makes no mention of a separate buffer. And g iven the facially integrated references to the two functions, the language is susceptible to being understood , in context, as implicitly calling for use of the same buffer for the storage of what is retrieved as the one used for the “downloading said portion” function

. P roper claim construction “demands interpretation of the entire claim in context, not a single element in isolation.” Pause Tech nology , LLC v. TiVo, Inc.
, 419 F.3d 1326, 1331 (Fed. Cir. 2005) (citations omitted). The specification, of central importance to determining a proper claim construction, is not in consistent with such a reading

. As Sound View acknowledges, the specification nowhere says that the invention includes use of separate buffers for the concurrent downloading and retrieving functions, and it nowhere illustrates or describes such an embodiment, in which different buffer s are involved in concurrent downloading of one portion and retrieving of a remaining portion of the same SM object in response to a given client’s request. See Sound View ’s Opening Br. at 34 n.5. The patent does, however, describe and illustrate an embodiment with only one buffer of the HS performing these simultaneous downloading (emptying) and retrieving (filling) functions. See ’213 patent, col. 8, lines 46

– 61; F ig. 7B. In addition, when describing embodiments in which Case: 21-1998 Document: 45 Page: 11 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 12

e ach HS has multiple buffers, i.e.
, “ring buffers in the memory,” id. , col. 5, line 57 , the specification indicates that “whenever a ring buffer is allocated ” to respond to a client request, “ as the ring buffer is filled, the data is simultaneously streamed to the requesting client ,” i d. , col. 7, lines 55

– 58 (emphasis added)

. It is agains t this background that we consider the prosecution history

. During prosecution, the examiner rejected original claim 16

— which was identical to issued claim 16 except that it lacked the downloading/retrieving limitation
, J.A. 4395

— as anticipated over DeMoney, J. A

. 4415. T o overcome the rejection, t he applicants amended the claim to add the downloading/retrieving limitation to claim 16
, J.A

. 4406 , and they distinguished DeMoney. The applicants explained that the added limitation, which “recite[d] additional features that the applicants consider as being inventive,” overcame the rejection based on DeMoney. J.A. 4410. The applicants first block quoted the A bstract of DeMoney and underlined a portion to highlight the distinction from the now

- claimed invention :A system for scheduling storage accesses of multiple co ntinuous media streams may include a plurality of media stream clients. Associated with each media stream client is one of a plurality of media stream managers. Each media stream manager maintains a ring of buffers configured to buffer media stream data between its associatedmedia stream client and one or more storage systems. A different deadline queue may be associate d with each one of the storage systems. Each deadline queue may be configured to queue buffer requests from the media stream managers. Each buffer request may include a deadline by which thebuffer request must be fulfilled by the corresponding storage s ystem. Each media stream manager may be configured so that once one of its buffers is Case: 21-1998 Document: 45 Page: 12 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 13

consumed by the associated media stream client
,the media stream manager submits a buffer request and deadline for that buffer to the appropriate deadline queue. Buffer requests may be ordered in each deadline queue from the earliest to latest deadline. Each media stream manager may be configured to provide a guaranteed maximum media stream rate to its associated media stream client.
J.A. 4410

– 11 ( underlining in applica nts’ statements). The

a pplicants then explained:
B y contrast, the applicants’ invention allocates a bu ffer

. . . and downloads the portion of the SM object to the requesting client, while concurrently retrieving a remaining portion of the requested SM obj ect from another HS or a content server

. That is, the applicants’ invention concurrently empties and fills the buffer, while the DeMoney reference teaches filling the buffer only after the buffer is empty.
J.A. 4411 (u nderlining in applicants’ statements) (citing DeMoney, col. 12 , lines 28

– 40)

. The cited portion of DeMoney, at column 12, lines 28

– 43 , which is relevant to the concept of a “deadline queue” discussed in the abstract
, explains : “As each buffer is consume d by the stream requester, a block request is issued along with a deadline time to fill the now consumed buffer [] ” ; t he buffers “ are accessed one after another in a circular manner ”; and “[t] he deadline time assures that each buffer is filled before it is needed by the stream requester .” Id. , col. 12, lines 28

– 30, 36

– 40. Finally, the applicants explained that support forthe added limitation is found in the applicants’ specification, pointing to the portion of the specification that shows concurrent downloading and retrieval involving a single buffer, as noted above. J. A. 4412; s ee ’213 patent, col. 8, line 51 , through col. 9, line 24

. Case: 21-1998 Document: 45 Page: 13 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 14

Based on the applicant s’ statements
, we agree with the district court that the applicants limited claim 16 to using the same buffer for the required concurrent downloading and retrieval of portions of a requested SM object

. We may look at the prior art the applicants were discussing to determin e what the applicants’ own words about prior art would mean to a relevant skilled artisan

. S ee Speedtrack
, Inc. v. Amazon.com , 998 F.3d 1373, 137 8– 80 (Fed. Cir. 2021) ; see also Technology Properties Ltd. v. Huawei Techologies Co. , 849 F.3d 1349, 1359 (Fed. Cir. 2017 ) (“T hequestion is what a person of ordinary skill would understand the patentee to have disclaimed during prosecution, not what a person of ordinary skill would think the patentee needed to disclaim during prosecution. ”). Here, t he portion of DeMoney cited by the applicants describes a process in which a single buffer of DeMoney downloads and retrieves portions of an SM object only serially , not concurrently; once the buffer is “ consumed ” (emptied by downloading to the client) , it is placed in a queue with a deadline by which it must be filled

. DeMoney, col. 12, lines 28

– 30. The passage describes the group of buffers as a whole performing these functions concurrently ; one buffer in the ring downloads the object to the client, while the others in the ring are filled in accordance with their deadline queues. Id. , col. 12, lines 36

– 40. The applicants in this case must be understood to have been distinguishing their invention (as newly narrowed bythe added limitation) on the basis of the distinction between serial and concurrent use of a single buffer. That distinction is communicated first by the applicants’ und erlining of the “once one of its buffers is consumed

. . .” language of the DeMoney Abstract. J.A. 4411. It is then highlighted by the applicants’ assertion of the “contrast” of their invention with DeMoney: “That is, the applicants’ invention concurrent ly empties and fills the buffer, while the DeMoney reference teaches filling the buffer only after the buffer is empty,” citing column 12, lines 28

– 40 of DeMoney

. Case: 21-1998 Document: 45 Page: 14 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 15

J.A. 4411. And it is reinforced by the applicants’ pointing,for support of the added limitation, to a part of their specification disclosing use of the same buffer for the concurrent processes. J.A. 4412.
Sound View suggests that its view of separate

- buffer concurrent actions (downloading and retrieving) would in fact have distinguished DeMone y because DeMoney does not disclose concurrent actions at all

. But t hat is not the legal inquiry, which focuses , rather, on what the applicants said about the prior art. Sound View relies on a passage in DeMoney stating that the invention “allows future [storage] requests to be satisfied during lulls” of activity, i d. , col

. 11, lines 28

– 33, which suggests, according to Sound View, that the buffers in DeMoney, even considered as a whole,perform downloading and retrieving serially, not concurrently. The a pplicants , however, did not cite th at passage in overcoming the rejection , and in any event, the passage cannot establish what Sound View urges. E ven if the passage suggests that that DeMoney “allows” se rial downloading and retrieving in the ring of buffe rs , it does not exclude concurrent downloading and retrieving , and it does not negate the disclosure of such concurrency in the passage that the applicants did cite. For those reasons, w e reject Sound View’s challenge to the district court ’s construction of the downloading/retrieving limitation, which we therefore affirm.
III After the district court adopted its “buffer”

- requiringclaim construction of the downloading/retrieving limitation, a construction we have now approved, it granted summary judgment of non

- infringement, concluding that accused

- system components called “caches”

— on which Sound View relied for its allegation of infringement under the court’s claim construction

— could not be the required “buffers.” We review the district court’s grant of summary judgment here de novo. See Apple Inc

. v. Wi

- LAN Inc., 25 Case: 21-1998 Document: 45 Page: 15 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 16

F.4th 960, 969 (Fed. Cir. 202 2) ( citing Estate of Diaz v. City of Anaheim , 840 F.3d 592, 604 (9th Cir. 2016 ))

. “Whether

an accused device infringes requires a two

- step analysis

— the court first ‘determines the scope and meaning of the patent claims asserted, and then the properly construed claims are compared to the allegedly infringing device.’” CommScope Tech nologie s LLC v. Dali Wireless Inc. , 10 F.4th 1289, 1295 (Fed. Cir. 2021) (citation s omitted ).
T he district court relied for its conclusion on the ’213 patent’s reference s to its described “buffers” and “caches”

as distinct physical components

. Summary Judgment Opinion

, 2020 WL 6821317, at * 4, * 6. The court noted that the ’213 patent describes buffers and caches in different locations: The patent defin es “ cache ” as “a region on the computer disk that holds a subset of a larger collection of data,” ’213 patent , col. 4, lines 7 –8 (emphasis added) ; and although the patent does not define “buffer,” it describe s “ring buffers” located “ in the memory ” of the HS
, i d. , col. 5, lines 55

– 60 (emphasis added)

. The court also cited other portions of the specification as distingu ishing “buffers” and “caches.” See, e.g.
, id. , col. 14, line 49, through col. 16, line 4 (claim 17) (reciting both “managing available memory in the form of a buffer pool ” and “means for recording data onto [a] cache” ), id.
, col. 7, lines 55

– 67 (discussin g sources for servicing client requests such as “the memory ring buffer,” and “cache on the disk”). The court then concluded that there could be no infringement because Sound View identified certain components in the accused edge servers labeled “cache s” as meeting the “buffer ” limitations (under its alternative infringement theory ), Summary Judgment Opinion

, 2020 WL 6821317, at *3, and “a cache” cannot satisfy the “buffer” limitations
, id. at *6. To the extent that the district court performed the first step of an infringement analysis

— claim construction

— all it did for the term at issue, “buffer,” was to declare what itmust exclude (a “cache”). The court did not adopt an affirmative constru ction of what constitutes a “buffer” in this Case: 21-1998 Document: 45 Page: 16 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 17

patent. But “‘ [a] lthough there is no per se rule against negative constructions, ’ which in some cases can be enough to resolve the relevant dispute,” Intel
, 21 F.4th at 811 (citation omitted) , the court’s construction here was inadequate for the second step of an infringement analysis

— comparison to the accused products or methods

. The district court did not decide, and the record doesnot establish, that “cache” is a term of such uniform meaning in the art that its meaning in the ’213 patent must be relevantly identical to its meaning when used by those who labeled the pertinent components of the accused edge servers. In the absence of such a uniformity -of- meaning determination, the district court’s conclusion that the ’213 patent distinguishes its buffers and caches is insufficient to support a determination that the accused -component “caches” are outside the “buffers” of the ’213 patent. What

was needed wa s an affirmative construction of “buffer”

— which c ould then be compared to the accused -component “caches” based on more than a mere name. The district court did not supply the needed construction.
There is an additional reason a further, affirmative construction is needed. Even in the ’213 patent, t he terms “buffer” and “cache” do not appear to be mutually exclusive, but instead seem to have at least some overla p in their coverage

. The disputed claim describes “allocating a buffer

. . . to cache ” a portion of the SM object, ’213 patent, col. 14, lines 39

– 40 (emphasis added)
, and the specification explains that “the ring buffer

. . . operates as a type of short t erm cache ” because it is capable of servicing multiple client requests within a certain time interval
, id.
, col. 7, lines 20 –22 (emphasis added). This intrinsic evidence suggests the absence of mutual exclusivity in general usage of the terms.
It appears that “buffer” should be given the ordinary meaning proposed by Sound View here and in the district court based on a dictionary definition: “temporary storage Case: 21-1998 Document: 45 Page: 17 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 18

for data being sent or received.” See Sound View ’s Opening Br. at 44; J. A

. 3959 , 3977

. And Sound View set forth factual evidence that the component of the accused edge servers called a “cache” meets the requirements of a “buffer” under its own proposed construction. J. A. 3742

– 50. Hulu has not meaningfully advanced a contrary affirmative co nstruction , and there is no definition stated in the ’213 patent itself. But we do not decide the issue, instead leaving to the district court the determination whether to conduct further proceedings on what affirmative construction should be adopted.
We note that the district court did not find it necessary to address a separate ground advanced by Hulu to support summary judgment of non

- infringement. Hulu argued that it was undisputed that, even if the edge servers’ caches could satisfy the buffer limitations
, claim 16 was still not met because , in the accused systems, those caches are not“allocated” to store at least a portion of the streaming media object, as r equired by the “allocat ing a buffer” limitation of claim 16. J. A

. 399 7–98 ; see also Hulu ’s Br. at 51. We will not address this assertion in the first instance. We vacate the summary judgment of non

- infringement and remand the case.
IV Because we are remanding for further proceedings, we address the district court’s two rulings that excluded certain damages evidence. We review a district court’s decision to exclude expert testimony for an abuse of discretion. See General Electric Co. v. Joiner , 522 U.S. 136, 141 (1997) (“[A]buse of discretion is the proper standard of review of a district court ’ s evidentiary rulings.”) ; MLC Intellectual Property, LLC v. Micron Technology, Inc. , 10 F.4 th 1358, 1367 (Fed. Cir. 2021); Messick v. Novartis Pharm aceutical s Corp.
, 747 F.3d 1193, 1196 (9th Cir. 20 14 ). We find no abuse of discretion in the district court’s application in this case of the basic evidentiary standards requiring reliability Case: 21-1998 Document: 45 Page: 18 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 19

and legal relevance of expert testimony —here offered onthe issue of a reasonable royalty for the particular infringement alleged. See Daubert v. Merrell Dow Pharm aceutical s, 509 U.S. 579 , 589 (1993) ; see also
, e.g. , MLC Intellectual Property , 10 F.4th at 1373

– 75; Virnet X

, Inc. v. Cisco Systems, Inc.
, 767 F.3d 1308, 1328 (Fed. Cir. 2014).
Mr. Yurkerwich’s first damages opinion, as discussed, relied on a study of adaptive streaming us ed by mobile devices in vehicles connected to a wireless wide

- area network in Sydney, Australia

— the Yao study

. Specifical ly, t he study sought to emulate bandwidth variation on commuting routes in Sydney in order to assess how H ypertext T ransfer P rotocol ( HTTP ) adaptive streaming “perform[s] under a typical high

- speed vehicular environment, wherein the wireless bandwidth vari es significantly and rapidly.” J.A. 317 5

. Mr. Yurkerwich adopted the results of that study to conclude that “adaptive streaming” reduces occasions of stalling on users’ devices by 80% , thus showing a significant advantage of the patented technology over old technology. J.A. 2825. He then concluded that, because the ’213 patent calls for such “ adaptive streaming, ” Hulu’s use of adaptive streaming captured that significant advantage, to be reflected in a royalty. Id. The district court reasonably determined that Mr. Yurkerwich did not account for substantial differences between the circumstances studied by Yao and the circumstances of Hulu’s accused streaming services . Specifically, Hulu’s services are used by many stationary viewers
, on desktop c omputers or televisions, via WiFi or wired connections with stable bandwidth
, in the United States

. Damages Opinion I

, 2019 WL 9047211, at *10. And the Yao study acknowledges that non

- adaptive streaming “is usually sufficient when the viewer is connected via a wiredconnection, which has high and fairly stable bandwidth capacity ,” J.A. 3175 , supporting the court’s conclusion thatMr. Yurkerwich’s failure to account for the streaming behavior of Hulu’s customers (including the proportion that Case: 21-1998 Document: 45 Page: 19 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 20

use stationar y devices with wired connections) rendered his opinion unreliable, Damages Opinion I

, 2019 WL 9047211, at *10

. For those reasons, and because the testimony of Sound View’s technical expert regarding the Yao study does not fill the gaps in justifying use of the Yao study, t he district court did not abuse its discretion in recognizing that Mr. Yurkerwich’s wholesal e adoption of the figures in the Yao study did not pass muster under the standards for admission of expert testimony. Id. at *9

– 11.
Mr. Yurkerwich’s amended damages opinion relied on a 2013 Conviva press release describing a 2012 Viewer Experience Report. The press release explains that the report measured over 22 billion video streams from viewers in 190 countries. Mr. Yurkerwich adopted the press release’s explanation that users in th e study watch ed 250% more content when they h ad an “optimal experienc e” with startup time s , buffering stalls , and bit rate s; because those are purported benefits of the claimed invention, he assumed that the study’s 250% increase in content should be credited to the claimed invention

. J. A

. 452 3–2 4.
T he district court reasonably found a key reliability problem in the fact that Mr. Yurkerwich did not himself see the report underlying the Conviva press release and did not ( and could not) adequately characterize the participants in the study (including wh at proportion were U.S. or non

- U.S. companies)
, or the study’s methodology, in adopting the 250% figure

. Damages Opinion II, at 4

. The district court recognized a decisive problem : “ [T] he press release does not include a sufficient, in

- depth discussion o f the study so thatit can be assessed, and then compared to the accused technology.” Id. And those deficiencies, the district court reasonably determined, were not made immaterial by the simple fact that a Hulu internal document reflected an increase ev en higher than 250% in viewed content due to use of adaptive bit rate streaming

. Damages Opinion II
, at 5

. Thus, the court did not abuse its discretion in excluding this testimony. Case: 21-1998 Document: 45 Page: 20 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 21

Although the exclusion stands independent ly on the foregoing basis, the district court also reasonably concluded that Mr. Yurkerwich did not have an adequate basis for treating the results of the Conviva

- reported study as sufficiently tied to the invention as claimed —or , therefore, for not undertak ing apportionment that would excludevalue reflected in the study (and derivatively in Hulu’s services) not attributable to the claimed invention. Damages Opinion II, at 4 –5. In terms of claim 16, the invention to be valued is only the practicing of the entirety of claim 16, including all limitations. To tie the study results (or Hulu’s service value) sufficiently to claim 16 would require at least determining how much of the improvement in user experience from use of adaptive streaming could still be ac hieved, and at what if any increased cost, without practicing the downloading/retrieving limitation of claim 16 , with its requirement of concurrent emptying and filling of the same buffer (as opposed to using more than one buffer but still adjusting bit ra tes ). The district court reasonably saw no adequate consideration of that conceptually central issue.
Sound View has not justified a different conclusion based on its invocation of Alaska Rent -A- Car, Inc. v. Avis Budget Group, Inc.
, 738 F.3d 960, 969

– 70 (9th Cir. 2013)

. There, the Ninth Circuit conclu ded that the district courtdid not abuse its discretion in admitting certain expert testimony, whereas here Sound View seeks to reverse a district court’s decision to exclude. The substantive damages issues were different, too: the case involved lost profit s for breach of contract, not, as here, a reasonabl e royalty for patent infringement. Id. at 968 . The Ninth Circuit held that the district court did not abuse its discretion in admitting testimony where the expert extrapolated market projections involvin g similarly situated companies, “gave reasons for his use of [the] comparisons,” and used a reliable methodology to “calculate damages from the breach, as opposed to damages from competition .” Id. at 968

– 69. That ruling does not show that the district court in the present case Case: 21-1998 Document: 45 Page: 21 Filed: 05/11/2022SOUND VIEW INNOVATIONS , LLC v. HULU , LLC 22

abused its discretion in finding critical deficiencies of reliability and relevance on the different record here.
V For the foregoing reasons, we affirm the district court’s claim construction of the downloading/retrieving limitatio n and its exclusion of both the original and amended damages testimony. But we vacate the entry of summary judgment of non

- infringement and remand for further proceedings consistent with this opinion. The parties shall bear their own costs. AFFIRMED IN PART, VACATED IN PART, AND REMANDED Case: 21-1998 Document: 45 Page: 22 Filed: 05/11/2022