News & Analysis as of

Expert Witness Patents Patent Invalidity

Mayer Brown

Reinvigorated Enforcement of Evidentiary Rules and the Permissible Uses of General Knowledge in Inter Partes Review

Mayer Brown on

On July 31, 2025, the Acting Director of the US Patent and Trademark Office (USPTO) issued a significant memorandum that alters the evidentiary landscape for inter partes review (IPR) proceedings before the Patent Trial and...more

WilmerHale

Federal Circuit Patent Watch: An Expert Need Not Have Acquired the Requisite Skill Level Prior to the Time of the Invention

WilmerHale on

Precedential and Key Federal Circuit Opinions - WISCONSIN ALUMNI RESEARCH FOUNDATION v. APPLE INC. [OPINION] (2022-1884, 8/28/2024) (Prost, Taranto, and Chen) - Prost, J. The Court affirmed two final judgments of the...more

IMS Legal Strategies

IMS Expert Insights: An Expert Witness Perspective on Inter Partes Review of Patents

IMS Legal Strategies on

An inter partes review (or IPR) of a patent is a trial proceeding conducted by the Patent Trial and Appeal Board (PTAB) when there is a challenge to patentability. The procedure for conducting IPRs took effect in 2012 and...more

McDonnell Boehnen Hulbert & Berghoff LLP

Cornell Research Foundation, Inc. v. Vidal (Fed. Cir. 2022)

Last month in Cornell Research Foundation, Inc. v. Vidal, the Federal Circuit affirmed the Patent Trial and Appeal Board's determinations in six inter partes review proceedings that invalidated the challenged claims for being...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

2021 PTAB Year in Review: Analysis & Trends

[co-author: Jamie Dohopolski] Love it or hate it, ignore the USPTO Patent Trial and Appeal Board (PTAB) at your peril. The introduction of the PTAB as part of the America Invents Act over ten years ago has forever changed...more

Goodwin

ITC 337 Quarterly Insider Q2 2020

Goodwin on

Goodwin’s 337 Quarterly Insider remains the premiere publicly available source for keeping up to date on all meaningful decisions coming out of the Commission. Please find below Goodwin’s insights on the months of April, May,...more

McDonnell Boehnen Hulbert & Berghoff LLP

HVLPO2, LLC v. Oxygen Frog, LLC (Fed. Cir. 2020)

Expert witness testimony is a frequent (almost ubiquitous) feature of patent litigation, if only because questions of the state of the art or the understanding of one having ordinary skill in the art are almost always at...more

Knobbe Martens

Non-Expert Testimony on Obviousness Is Inadmissible

Knobbe Martens on

HVLPO2, LLC v. OXYGEN FROG, LLC - Before Newman, Moore, and Chen. Appeal from the United States District Court for the Northern District of Florida. Summary: It is an abuse of discretion to permit a witness to testify...more

Jones Day

District Court deference to PTAB regarding priority claim? Not necessarily.

Jones Day on

In instituting IPR of a particular patent, the PTAB found that the patent was not entitled to its priority claim, thus opening it up to invalidity attacks. However, because the PTAB’s decision was not being challenged in the...more

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