A Blog About Intellectual Property Litigation and the District of Delaware


Entries for tag: Prior Art

Court Permits Reliance on Non-Prior Art Documents as Evidence of Prior Art

Andrew E. Russell, Sept. 28, 2022
FRE 803 Hearsay

AI-generated image of a defendant relying on non-prior art documents as evidence of prior art
AI-generated image of a defendant relying on non-prior art documents as evidence of prior art Andrew E. Russell, displayed with permission

Judge Stark issued an oral order yesterday addressing a motion in limine in Otsuka Pharmaceutical Co., Ltd. v. Zenara Pharma Private Ltd., C.A. No. 19-1938-LPS (D. Del.).

According to the briefing, plaintiff sought to exclude two exhibits that were dated after the priority date of the patent.

The first was a 2005 "review article" published just months after the priority date. According to defendants' brief, "does not present original data" and instead "discusses the information known in the art before the priority date."

The second exhibit was published in 2021 and includes a "history of research …

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Too Far: Judge Andrews Denies Post-Trial § 101 Motion on System for Blending Gasoline and Butane

Andrew E. Russell, Aug. 31, 2022
Prior Art § 101

Tanks
Patrick Federi, Unsplash

Judge Andrews resolved what seems like a tough § 101 motion today, and I thought the claims of the patent (and the outcome) were interesting.

The patent involves a system for mixing gasoline and butane. The patent specification said that these fuels were previously mixed in multiple ways, including in a laborious process involving manually adding butane to a tank of gasoline and then stirring the two together.

There were a number of claims at issue, but the one that stands out most to me simply claims the whole system and what it does, without claiming how the components work:

A system for blending gasoline and butane at a tank farm comprising:
a) a tank of …
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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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