Nathan Mammen is a seasoned litigator with extensive experience in intellectual property trial and appellate cases. Known for leading high-stakes, bet-the-company litigation, Nathan has successfully tried cases nationwide. His experience spans a range of industries and technologies, including agricultural equipment, digital agriculture technology, medical devices, radio-frequency identification, wireless communication, semiconductors, biotechnology, pharmaceuticals, and mechanical devices.

Nathan has represented clients at all levels, from trial court or administrative boards through appeals, including at the United States Supreme Court. He has argued in numerous courts of appeals and has extensive experience in appeals before the U.S. Court of Appeals for the Federal Circuit.

Nathan is frequently involved in or consulted about matters before the Patent Trial and Appeal Board and U.S. Patent and Trademark Office. He worked as a patent examiner before and during law school.

Passionate about giving back through pro bono service, Nathan frequently represents his fellow veterans seeking benefits, including regularly handling appeals before the U.S. Court of Appeals for the Federal Circuit and bringing attention to systemic legal issues affecting veterans.

Nathan is a veteran of the U.S. Army. During his military service, he served as appellate counsel in dozens of military criminal cases. In 2012–2013, Nathan volunteered for active duty in support of Operation Enduring Freedom and served as a military prosecutor in Kuwait.

Representative Experience

Intellectual Property Trial Litigation

• Defended Farmers Edge, Inc., a global leader in digital agriculture, in a multi-patent competitor case that resulted in all asserted patents being found invalid.

• Defended Carlisle Companies against a competitor’s allegations of infringement and obtained a jury verdict of both noninfringement and invalidity.

• Represented global manufacturer of agricultural and industrial equipment as a plaintiff in a patent infringement litigation against two competitors in a two-week trial that resulted in a jury verdict of infringement.

• Represented Heineken in defensive and offensive patent-based ITC investigations relating to blow-molding plastic bottles and drink machines.

• Defended Kapsch TrafficCom, a leading worldwide tolling systems provider in a multi-jurisdiction, multi-patent infringement action brought by competitor concerning patents alleged to be essential to the 6C/Gen2 RFID standard that resulted in the asserted patents being found invalid.

• Represented drilling technology company in district court infringement action and ten inter partes review proceedings involving petroleum drill bit technology.

• Represented Lenovo in a trial in the Patents Court of the High Court of England and Wales on the validity of a standard essential patent.

• Represented major electronics manufacturer in international arbitration concerning valuation of a portfolio of thousands of patents.

• Represented major electronics manufacturer in multiple ITC proceedings concerning wireless communication technologies.

• Represented major defense contractor in international arbitration with foreign competitor concerning intellectual property rights to sensitive defense technology.

Intellectual Property Appellate Litigation

• Appellate counsel for cosmetic implant developer in trade secret, trademark, copyright, and contract dispute.

• Appellate counsel for major pharmaceutical manufacturers in landmark case involving antibody technology in two Federal Circuit appeals and before the Supreme Court, resulting in a complete win for clients.

• Represented Intel in three separate Federal Circuit appeals challenging decisions of Patent Trial and Appeal Board that had affirmed validity of patents asserted by patentee in litigation, and obtained reversals of Board decisions; argued one appeal.

• Represented global marine recreation company in a Federal Circuit appeal challenging a jury verdict of willful infringement and enhanced damages, attorneys’ fees, and a permanent injunction and obtained a reversal of the verdict.

• Represented patentee in an appeal to the Federal Circuit defending a jury verdict of willful infringement, including a nine-figure damages verdict and an ongoing royalty award.

Other Trial and Appellate Litigation

• Lead trial and appellate counsel representing six decorated Coast Guards veterans in class action challenging the government’s forced retirement of them and hundreds of other senior enlisted personnel.

• Represented family in Ninth Circuit appeal challenging a summary judgment order that had dismissed claims against state for negligent investigation that led to separation of family and obtained a remand for trial.

• Represented veteran in D.C. Circuit appeal challenging administrative board’s refusal to correct service record and obtained a reversal of board’s decision.

• Represented generic drug manufacturer in class action raising antitrust claims based on settlement of patent case.

• Represented client in landmark Third Circuit appeal involving Americans with Disabilities Act and Due Process challenges to a state policy for forcible medication of involuntarily committed patients in state hospitals.

• Argued numerous other cases in courts of appeals on behalf of veterans and indigent defendants.

Rankings & Honors

• The Legal 500 U.S. for Intellectual Property – Patent Litigation (International Trade Commission) (2020)

Community & Professional Activities

• Federal Circuit Bar Association

• PTAB Bar Association

• National Institute of Military Justice, Fellow

Publications

• “Apple v Masimo: Could a Fed. Cir. Decision Limit Patent Cases at the ITC”, Co-Author, World Intellectual Property Review (July 29, 2025)

• “SAP, Google, Goodyear: Hot summer cases at the Federal Circuit“, Co-Author, World Intellectual Property Review (July 23, 2025)

• “How Artificial Intelligence Will Naturally Affect Patentability“, CoaAuthor, Westlaw Today (March 24, 2025)