A Blog About Intellectual Property Litigation and the District of Delaware


Entries for tag: Affirmative Defenses

What a Successful Equitable Estoppel Defense Looks Like

Andrew E. Russell, July 13, 2023
Equitable Estoppel Affirmative Defenses

I imagine a poor Sirius XM Radio satellite, drifting listlessly through space with nothing to do after 3G and smart phones ate its business model.
I imagine a poor Sirius XM Radio satellite, drifting listlessly through space with nothing to do after 3G and smart phones ate its business model. SpaceX, Unsplash

In answering patent infringement complaints, defendants often do their best to throw in any potentially supportable equitable estoppel / implied license defense they can think of. But in patent actions, these defenses can be hard to prove and are rarely successful. They typically drop off at some point later in the case.

This week we got a great example of what a successful equitable estoppel defense looks like, in an opinion from Judge Bataillon granting summary judgment on that basis.

Basically, it involved lots of incredibly strong facts.

The defendant is Sirius …

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Judge Bibas Notes Delaware Split Regarding Unclean Hands Counterclaims in Patent Cases

Andrew E. Russell, Aug. 16, 2022
MTD Motion to Dismiss

Hand Washing
Tim Mossholder, Unsplash

In an opinion on Friday, visiting Judge Stephanos Bibas of the Third Circuit pointed out a split in District of Delaware cases regarding whether a party can bring unclean hands counterclaims in patent cases:

Nor does TexasLDPC persuade me this declaratory-judgment counterclaim fails as a matter of law. True, courts disagree whether “unclean hands” can support a declaration that a patent is unenforceable. Compare In re Gabapentin Patent Litig., 649 F. Supp. 2d 340, 348 (D.N.J. 2009) (concluding it cannot), and Kimberly-Clark Worldwide, Inc. v. Cardinal Health 200, LLC, 2012 U.S. Dist. LEXIS 104983, at *2–3 (D. Del. Jul. 27, 2012) (same),[ ]with The Meds. Co. v. Teva Parenteral Meds., Inc., 2011 WL 13141923, at *1 n.2 (D. Del. Oct. 6, 2011) (denying motion to dismiss or strike unclean hands counterclaim).

Judge Bibas sided with the cases holding that "unclean hands" is a proper counterclaim in a patent action:

Still, I will not stop Defendants from demanding a declaratory judgment about the unclean-hands doctrine. In my view, I may grant such relief. See Qualcomm Inc. v. Broadcom Corp., 548 F.3d 1004, 1025–26 (Fed. Cir. 2008) (“[A] district court ...
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What Does It Take for "Unclean Hands" and "Prosecution Laches" Affirmative Defenses to Actually Survive a Motion to Strike?

Andrew E. Russell, March 14, 2022
Motion to Strike Affirmative Defenses

These hands actually look pretty clean.
These hands actually look pretty clean. Nathan Dumlao, Unsplash

Defendants in patent cases often seem to throw in somewhat obscure affirmative defenses with little or no factual support. "Unclean hands" is a classic example. Defendants will sometimes seem to include defenses like unclean hands and prosecution latches with no real factual support (and, I suspect, not always the best grasp on what those defenses really mean).

Judge Stark issued an opinion today on a motion to strike "unclean hands" and "prosecution laches" defenses offers an example of what happens when a defendant actually does adequately support these defenses.

First, the standard: to succeed on a motion to strike affirmative defenses, the insufficiency must be "clearly apparent":

"[P]ursuant to Rule …
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