Durie Tangri

United States (National)


Dispute resolution

Although California-based Durie Tangri is a litigation boutique with practices and lawyers dedicated to white-collar crime, commercial, appellate and class action litigation, the firm is most widely known for its highly respected intellectual property practice. Name founders Daralyn Durie and Ragesh Tangri are both renowned IP litigators who have worked with some of the largest industry-leading companies in technology and pharmaceuticals. Durie is nationally recognized as one of the top IP litigators with a diverse practice that involves patent, copyright, and trademark litigation. As a fierce advocate for clients, she is routinely retained to handle the most complex and contentious matters.  

Recently, in the first in-person jury trials after COVID-19, Durie obtained back-to-back wins for clients Plexxikon, the developer of the first FDA-approved targeted therapy for metastatic melanoma, and Activision Blizzard. Representing Plexxikon against Novartis in a patent infringement case in the Northern District of California, Durie scored $178 million for the client, along with a finding of patent infringement, in July 2021. She also scored a win for Activision Blizzard in a copyright infringement case against over Call of Duty Black Ops 4, which garnered a significant amount of attention. The case was litigated in the Northern District of Texas and Durie obtained a complete defense verdict for the client.  

Tangri’s practice expands beyond intellectual property to include legal malpractice litigation that arises from professional negligence claims. His intellectual property practice has involved numerous trade secret cases, as well as copyright infringement disputes, particularly on behalf of start-up companies. He is also a patent litigator with a number of patent infringement cases under his belt.  

Fellow founder Mark Lemley is a seasoned litigator with decades of experience in intellectual property, antitrust and internet law. He is widely recognized for his expertise in all three areas of law and litigation. Joseph Gratz is most distinguished for his copyright litigation, handling some of the biggest cases that often garner media attention. Gratz represents both individuals against major companies in addition to the industry-leaders like Google.