Sarah Kao-Yen Tsou - Partner

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Sarah Kao-Yen Tsou

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New York
Phone: +1 212-446-6435
Fax: +1 212-446-6460
Overview News

Professional Profile

Sarah Tsou is a partner in the Intellectual Property Practice Group of Kirkland’s New York office. Sarah focuses her practice on patent litigation in technological fields including oilfield services, power converters, medical devices, pharmaceuticals and system security. Sarah has examined fact and expert witnesses at trial, successfully argued motions in court, and been a member of numerous trial teams that have obtained favorable verdicts, judgments and settlements, both for plaintiff and defendant. Representative clients include Boston Scientific Corporation, Cisco, Forest Laboratories, IBM, Murata, Schlumberger and Tyco.

Representative Matters

Trial counsel for WesternGeco LLC in its assertion of patents relating to marine seismic exploration technology against ION Geophysical Corp. and Fugro-Geoteam. After a four-week jury trial, obtained a $105.9 million verdict against ION and a finding by the jury that all four WesternGeco patents were valid and willfully infringed. This verdict received considerable press coverage, was featured in Am Law Daily and Law360, and was named by Texas Lawyer as the second highest Texas jury verdict in intellectual property in 2012.

Trial counsel for Murata in a patent infringement case brought by SynQor, Inc. seeking millions of dollars for Murata’s post-injunction, worldwide sales of power converter products. After securing favorable rulings during summary judgment and pretrial proceedings, represented Murata in a four-day bench trial. The case remains pending before the United States District Court for the Eastern District of Texas.

Representing seven banks in multiple districts in a patent infringement litigation brought by Intellectual Ventures involving online banking and security technology. 

Represented Schlumberger Technology Corporation in multiple patent infringement litigations involving land and marine oilfield services technology.

Represented Boston Scientific Corporation in multiple patent infringement litigations regarding medical devices including cardiovascular stents and aortic aneurysm grafts.

Represented Tyco Healthcare Group LP in its patent infringement litigation regarding surgical trocar products.

Represented H. Lundbeck A/S and Forest Laboratories Inc. in patent infringement litigation brought against their LEXAPRO® and CELEXA® brand antidepressants.

Other Distinctions

Member, Kirkland & Ellis LLP New York Associates Committee (2011-2012)

Member, Kirkland & Ellis LLP Intellectual Property Group Planning Committee

ALLSA Liaison, Kirkland & Ellis LLP Diversity Committee

Recipient, Kirkland & Ellis LLP Pro Bono Service Award, 2008


Neuron Number in the Entorhinal Cortex and CA1 in Preclinical Alzheimer's Disease, Archives in Neurology, September 2001.


United States District Court for the Southern District of New York

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