Lowenstein Sandler

Lowenstein Sandler LLP is a national law firm with principal offices in Roseland, New Jersey, and New York, New York. The firm maintains an extensive office footprint across the United States, with additional locations in Palo Alto and San Francisco, California; Salt Lake City, Utah; Washington, D.C.; and Wilmington, Delaware. With over 400 lawyers, Lowenstein Sandler is recognized as a BigLaw firm, ranking 104th on The American Lawyer's 2026 Am Law 200, having generated $523,439,000 in gross revenue in 2025.

The firm's Intellectual Property practice demonstrates a broad technical reach, advising clients on patent applications, prosecution, and litigation across a multitude of industries. Their attorneys possess diverse technical backgrounds, including degrees in physics, chemistry, biology, electrical engineering, mechanical engineering, and computer science. This expertise allows them to handle complex patent matters involving cutting-edge technologies such as artificial intelligence, machine learning, blockchain, fintech, life sciences, software, semiconductors, fiber optic switching systems, and business methods. The firm's capabilities in patent prosecution are further highlighted by its ranking among top firms for both the volume and quality of patent filings, including a strong presence in USPTO Tech Center 2100 for computer architecture and software.

While the firm acted as local counsel for the plaintiff in the tracked patent infringement case, AG18, LLC v. DraftKings Inc., its broader IP litigation practice serves a diverse client base. Lowenstein Sandler represents founders, entrepreneurs, investors, startups, and Fortune 500 companies, focusing on protecting and monetizing intellectual property throughout the corporate lifecycle. A notable tracked case is AG18, LLC v. DraftKings Inc., initially filed in the District of New Jersey, which is currently on appeal before the U.S. Court of Appeals for the Federal Circuit.

Lowenstein Sandler also possesses a robust practice in post-grant proceedings before the U.S. Patent and Trademark Office (USPTO). Their experience includes handling re-examination and post-grant proceedings, with their patent prosecutors well-versed in navigating these complex administrative challenges. The firm actively engages with strategies involving re-examination filings, reflecting their comprehensive approach to patent validity.

Key partners leading the firm's Intellectual Property practice include Mark P. Kesslen, who chairs the Intellectual Property practice, and Marina Portnova, who leads the Software & Electronics practice. Other prominent partners in their Patent Counseling & Prosecution team include Kevin O. Grange and Benjamin A. Kimes. These individuals bring extensive experience in patent strategy, prosecution, and litigation across various technological domains.