A Blog About Intellectual Property Litigation and the District of Delaware


Entries for tag: Pennypack

New Standard for Striking a Theory from a Rebuttal Expert Report

Andrew E. Russell, Sept. 4, 2020
Pennypack Discovery

Stop Sign
Luke van Zyl, Unsplash

This week, Judge Burke issued an interesting oral order on a discovery dispute about the admissibility of "new" expert opinions in rebuttal reports.

In the order, he sets forth a simple baseline test for what a party has to show to strike purportedly "new" expert opinions in a rebuttal report. To succeed in striking a "new" theory, a party must show at least:

(a) how they clearly disclosed that theory well before final . . . contentions were due . . . ; (b) how the same theory was thereafter found in their opening expert reports . . . ; and (c) how [the opposing party] never provided any substantive response to that theory until …
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Court Finds Late Doctrine of Equivalents Theory Prejudicial Because Adding DOE "Creates a New Ballgame"

Andrew E. Russell, July 31, 2020
Expert Discovery Pennypack

Remember these?
Remember these? Tim Gouw, Unsplash

It can be tough to get late-produced theories or evidence excluded in Delaware, because the Court must apply the permissive Pennypack factors that typically favor admission.

The factors include prejudice, ability to cure any prejudice, disruption of trial, and bad faith/willfulness.

But lately, the Court seems to be granting more motions to strike such theories. Today, Judge Andrews granted a motion to strike a late DOE theory offered for the first time in a reply report.

Judge Andrews Isn't Messing Around

He shot down the Pennypack factors in four short and to-the point paragraphs.

As to the first factor, he found prejudice because admission of a late theory requires …

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"Though the Pennypack factors may be very forgiving, they are not a sieve."

Andrew E. Russell, June 19, 2020
Discovery Dispute Pennypack

This is not an illustration of the Pennypack factors in action
This is not an illustration of the Pennypack factors in action Lindsay Cotter, Unsplash

I just came across the above quote, which is from a discovery dispute back in April where Judge Burke struck a very-late-disclosed witness.

It's an interesting—and accurate—description of the Pennypack factors. Most DE patent litigators are familiar with Pennypack, which set forth a loose set of factors for deciding whether to apply the "extreme" sanction of excluding "critical" evidence. Meyers v. Pennypack Woods Home Ownership Ass’n, 559 F.2d 894, 905 (3d Cir. 1977).

Even though Pennypack issued way back in 1977, modified versions of its list of factors are still applied today. When they come up, they most often favor the party producing …

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