Zachary H. Rabicoff

Note: The provided case data for "Zachary H. Rabicoff" of Rabicoff Law appears to refer to Isaac Rabicoff, the founding attorney of Rabicoff Law LLC and counsel of record in the specified case.

Professional Summary: Isaac Rabicoff

Isaac Rabicoff is the founder of Rabicoff Law LLC, an intellectual property litigation boutique based in Chicago. His practice concentrates on patent enforcement, representing patent owners in infringement litigation nationwide. The firm's litigation activity spans a variety of technology sectors, including software and e-commerce, as seen in the recent case against Udemy concerning a patent on authenticating electronic content to prevent phishing. Rabicoff Law has been noted for its high volume of patent litigation, having been ranked by Lex Machina as one of the most active firms in 2017.

Rabicoff’s practice primarily represents plaintiffs in patent assertion campaigns, often on behalf of non-practicing entities (NPEs). The single tracked case, Authentixx LLC v. Udemy Inc, reflects this focus, with Rabicoff serving as lead counsel for the plaintiff. His firm has initiated licensing and litigation campaigns against numerous major technology companies, including Amazon, Apple, and Google. In 2020 and 2025, Rabicoff's litigation conduct drew sanctions and a referral to a professional conduct committee in the Northern District of California for procedural violations and making misleading arguments in court filings.

In addition to district court litigation, Rabicoff represents patent owners in post-grant proceedings before the Patent Trial and Appeal Board (PTAB). His firm's website notes successes in defeating the institution of inter partes review (IPR) and covered business method (CBM) review petitions. He has also represented patent owners in appeals before the U.S. Court of Appeals for the Federal Circuit.

According to his firm's biography, Isaac Rabicoff earned his J.D. from Loyola University Chicago and a Bachelor of Science in Physics from the University of Kansas. He is a registered patent attorney and is admitted to the Illinois bar, the U.S. Supreme Court, and the Federal Circuit, among other federal courts.