Mark Hannemann is a partner in Litigation practice and is based in the New York office.  He is a leading patent litigator with extensive first-chair experience for both plaintiffs and defendants in jury trials, bench trials, and ITC hearings.  He has frequently appeared in the Eastern District of Texas, the District of Delaware, and other US district courts, and has a successful appellate practice.

Mark’s frequent clients have included Robert Bosch, OSRAM, and Volkswagen. He is recommended in the 2013 edition of The Legal 500 in the area of “IP – Patent Litigation: full coverage,” and the 2014 edition of New York Super Lawyers. He has also been recognized as a New York “IP Star” by Managing Intellectual Property (2014). Most recently, IAM’s Patent 1000 recommended Mark as a “legal theory and strategy thinker” (2020), noting that the Shearman team includes “an expert panel of patent litigators.” The publication also noted that "Mark is smart and efficient, and his advice and arguments are always very much to the point” (2021).

• Lead defense counsel, along with partner Tom Makin, in an industry-wide ITC investigation and evidentiary hearing related to LED technology, which resulted in an initial determination of patent non-infringement and invalidity.
• Represented SS&C in trade secret litigation in Connecticut state court, obtaining significant victory on a motion for sanctions that led to a favorable settlement.
• Lead counsel to Robert Bosch LLC in its windshield-wiper patent enforcement campaign. Over the last eight years Bosch has defended its beam-blade market by enforcing its US windshield-wiper patents against competitors large and small. The campaign included a landmark Federal Circuit victory in the Bosch v. Pylon appeal, in which the Court of Appeals reversed a District Court decision and, in an important ruling helping to define the continued availability of injunctions after the Supreme Court’s 2006 eBay decision, ordered the District Court to enter the injunction Bosch had requested. The same series of appeals gave rise to an en banc Federal Circuit argument and decision on a question of appellate jurisdiction raised by Bosch.
• Represented Robert Bosch LLC in numerous defense matters over the last fifteen years, including District Court litigations and an ITC investigation.
• Represented the Volkswagen Group in numerous patent litigations, including an infringement case in the Eastern District of Texas where the team was successful in obtaining summary judgment on liability issues and a bench trial on standing issues, both of which were affirmed on appeal.
• Lead counsel to Sony in a patent litigation in the Western District of Texas involving two patent portfolios. Working cooperatively with Sony’s co-defendants, the team obtained claim-construction rulings that led to a stipulation of non-infringement with respect to one portfolio and obtained a stay of the remainder of the litigation and returned the second portfolio to the Patent Office, where all the originally asserted claims were successfully disposed of.
• Lead counsel to Janam in defeating a motion for preliminary injunction filed by Symbol Technologies in the District of Delaware.

Professional Activities

Mark is a member of the Federal Circuit Bar Association, and a FCBA Global Fellow. He is also a frequent participant in meetings of other professional organizations, including AIPPI, IPO, and the NYIPLA.