A Blog About Intellectual Property Litigation and the District of Delaware


Entries for tag: Expert Discovery

Court Holds That No, You Can't Just Recycle an Expert Opinion from a Prior Case

Andrew E. Russell, May 28, 2025
Expert Witness Expert Discovery

Recycle Bin
Sigmund, Unsplash

We missed an interesting decision from Judge Fallon last month. In Marquinez et al v. Dole Food Company Inc., C.A. No. 12-695-RGA-SRF, D.I. 582 (D. Del. Apr. 24, 2025), Judge Fallon rejected an attempt to "recycle" an expert opinion from a prior, related action.

Apparently the plaintiff had previously retained the experts, and attempted to re-use their prior expert opinions, by admitting the transcript of their prior testimony:

The Hendler Declaration confirms that both witnesses were formally retained as expert witnesses in a prior litigation, they served expert reports in the prior litigation, and both were asked but declined to serve as retained expert witnesses in this case. (D.I. 580 at ¶¶ 9-13) Plaintiffs …
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Judge Williams Declines to Exclude Expert Opinions on the Law by a Law Professor and a Lawyer (for a Bench Trial)

Andrew E. Russell, Feb. 26, 2025
Expert Witness Expert Discovery

"Your honor, in my expert opinion, the law says we win. Their expert is wrong, because he thinks the law says we lose." AI-Generated, displayed with permission

The Court often excludes experts who offer opinions regarding U.S. law itself—but there are some gray areas and circumstances where the Court has permitted such testimony. In patent cases, for example, the Court has typically excluded expert testimony about substantive issues of patent law, but has sometimes permitted experts to testify on PTO procedures (and sometimes not).

This week we got some more guidance, specifically in the context of a bench trial. In Upsher-Smith Laboratories LLC v. Zydus Pharmaceuticals (USA) Inc., C.A. No. 21-1132-GBW, the Court unsealed an order from last year …

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Patentee's Own Weak Interrogatory Responses Cause Denial of Its Motion to Strike Opposing Party's Late Expert Argument

Andrew E. Russell, Dec. 11, 2024
Expert Discovery Expert Reports

"Behold, our fulsome and complete damages theory disclosure. I'm sure this won't cause us any problems down the line." Andy Bridge, Unsplash

Parties in patent cases are often tempted to provide bare-bones responses to contention interrogatories, offering just enough to preserve their ability to expand on the arguments later during expert reports. That's easier, obviously, than providing more detailed contentions, and it also maintains flexibility as discovery develops.

Plus, parties simply may not have fully developed their theories at the time contention interrogatories are due. Expert reports are when theories are typically fully fleshed out, after discovery has closed and the universe of information is set, more or less.

But there is another consideration as well, beyond preventing a …

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The Risks of Deposing the Other Party's Expert

Andrew E. Russell, Nov. 15, 2024
Expert Witness Expert Discovery

Should we take our chances now with a motion to strike, or later with a <a href='#' class='abbreviation' data-bs-toggle='tooltip' data-placement='top' title='Motion in Limine'>MIL</a>? Or just not play?
Should we take our chances now with a motion to strike, or later with a MIL? Or just not play? Hush Naidoo Jade Photography, Unsplash

You don't have to depose the other parties' experts, and strategically, sometimes it can make sense not to. If you have a good sense that their report(s) are flawed and they may use the deposition to try to add key information to the record (regardless of your questions), it may make sense to avoid the deposition altogether.

That strategy is less common but certainly not unheard of—assuming trial counsel is confident in their positioning and ability to …

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Court Bars Technical Expert's Testimony About Opposing Party's "Purported Litigation Misconduct, Corporate Culture, and Ethics"

Andrew E. Russell, June 28, 2022
Expert Witness Expert Discovery

Is there corporate culture in there? Let's hear from our expert...
Slejven Djurakovic, Unsplash

When expert reports go back and forth in a patent case, it's not uncommon to see complaints from the patentee's expert along the lines of "I understand that the opposing party did not produce information regarding x, so I will instead base my opinions y."

In other words, the expert wants to keep the door open to explain to the jury that he or she would have done a particular analysis if only the other side had given them the information they needed. But, obviously, the other side may object to that testimony.

Judge Connolly addressed a situation like yesterday, and held that the expert cannot just testify to the jury about the other sides alleged …

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System Prior Art Strikes Again

Andrew E. Russell, May 24, 2022
Expert Discovery Pennypack

Copyright Symbol
Andrew E. Russell

We've talked before about how asserting invalidity based on system prior art (as opposed to written publications, for example) can be tricky, because accused infringers can face all kinds of sometimes-unexpected difficulties with proving up the prior art.

Parties often get into sticky evidentiary questions about exactly what kinds of evidence are sufficient to show that the relevant prior art was on sale before the priority date, and how the prior art functioned—and whether that all of that evidence has authenticity or hearsay issues.

On Friday, Magistrate Judge Burke issued a long oral report and recommendation to grant summary judgment of no invalidity based on a system prior art reference. In the case, the defendants relied …

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Judge Andrews: 25-Reference Obviousness Analysis Without Specific Combinations Is Not a Daubert Problem

Andrew E. Russell, April 20, 2022
Expert Witness Obviousness

"Pick a card, any card . . . that's our secondary obviousness reference." Aditya Chinchure, Unsplash

Judge Andrews issued a short memorandum order today denying two Daubert motions based on an obviousness analysis where an expert identified a main reference and 24 additional references, without listing specific combinations.

The analysis apparently sorted the prior art into categories:

The main point of both motions is the assertion that Dr. Lepore has not identified specific combinations of prior art for his obviousness analysis. Defendants have referred to a portion of Dr. Lepore’s report where he lists categories of references. . . . [T]he expert has one reference as the “lead compound.” The expert has three additional categories of references: (1) four that show “c-Met’s role in various Cancers,” (2) six references “related to selecting a lead compound,” and (3) fourteen references “related to modifying the lead compound.”

As the Court explained, a usual case may involve a multiple-reference "state of the art" or motivation to combine analysis, so this is not a Daubert issue:

My view is that, in the usual case, an obviousness combination requires the identification of two or sometimes three references that disclose the requisite claim elements, and (usually) additional references, which can be ...
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Another Day, Another Doctrine of Equivalents Argument Excluded

Andrew E. Russell, Feb. 1, 2021
Contentions Expert Discovery

Even when plaintiffs know of the potential weak spots in their infringement cases, they sometimes fail to address DOE until too late, or they offer a DOE analysis so weak that it gets excluded or wiped out by summary judgment.

That's what happened last week, when Chief Judge Stark struck a DOE opinion after a plaintiff tried to squeak by on the idea that its late DOE argument should be permitted because it never affirmatively disclaimed DOE:

Arendi's passing reference to DOE in its complaints followed by its lack of affirmative disclaimer of DOE theories (see, e.g., C.A. No. 12−1595 D.I. 238 at 5) ("Arendi has never asserted that its claims were limited to literal infringement") does …
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On the Perils of Not Agreeing to a Reasonable Case Management Request

Andrew E. Russell, Jan. 7, 2021
Expert Discovery Litigation

Caution Tape
Hiroshi Kimura, Unsplash

I came across this case today, and I thought it was a good example of why, in Delaware, it can be dangerous to be seen as acting unreasonably, particularly when it comes to things like discovery disputes and case management.

Plaintiffs filed a first case in 2018, asserting infringement of a single patent. Earlier this year, it filed a second case against the same defendant for a newly-issued patent relating to the same subject matter.

Plaintiffs sought to consolidate the two cases because they involved similar facts:

[The cases involve] identical parties, identical accused acts of infringement, the same accused process, and related patents with identical inventors, materially identical specifications, and overlapping claim terms.

Defendants opposed …

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Chief Judge Stark Confirms $137m Damages Award on 65% Royalty Theory, But Reverses Jury Finding of Willfulness

Andrew E. Russell, Nov. 30, 2020
Damages Willfulness

Dollar Bills
Sharon McCutcheon, Unsplash

Chief Judge Stark today released his opinion on post-trial motions in Roch Diagnostics Co. v. Meso Scale Diagnostics, LLC, C.A. No. 17-189-LPS (D. Del.), following a jury trial last year that resulted in a $137m verdict and a finding of willfulness.

Damages Award on 65% Royalty Theory Confirmed

The Court denied a post-trial motion to undo the jury's damage finding, which equated to an approximately 65% royalty rate (or more, depending on the royalty base).

Interestingly, the jury awarded damages after a one-sided royalty rate presentation by Roche, the accused infringer. The Court had previously excluded the patentee's damages expert's opinion as to the royalty rate, because it used the wrong date …

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