Highlight Image
Kenyon Successfully Represents Toyota in Years-Long Patent Litigation

Kenyon & Kenyon LLP successfully represented Toyota Motor Corp. in a long term patent litigation against American Vehicular Sciences (AVS). Originally brought by AVS in the Eastern District of Texas, the matter asserted 24 patents across seven separate cases – accusing essentially every major Toyota vehicular safety system. In the three years since the original filing, the Kenyon team filed 12 separate petitions for inter partes review (IPR) and won a stay in the E.D. Tex. pending resolution of the IPRs. The Patent Trial and Appeal Board granted each of the IPRs, and significant claims were cancelled or dropped. Additionally, the Kenyon team successfully petitioned the Federal Circuit for a writ of mandamus and the case was transferred from the E.D. Tex. to the Eastern District of Michigan, and filed various invalidity summary judgment papers, causing the plaintiff to drop a number of other asserted patents. In May of 2015, the E.D. Mich. granted the plaintiff’s unopposed motions to dismiss with prejudice all of the remaining cases against Toyota. (2015)

Mark A. Hannemann Partner
New York, NY 1.212.908.6238


Mark Hannemann is one of Kenyon’s leading patent litigators and a member of the firm’s Executive Committee. He has first-chair experience for both plaintiffs and defendants, in jury trials, bench trials, and ITC hearings, with frequent appearances in the Eastern District of Texas, the District of Delaware, and other U.S. district courts, as well as a successful appellate practice.  His most frequent clients include Robert Bosch, Sony and Volkswagen. He is recommended in the 2013 edition of The Legal 500 United States 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).

Representative Experience

  • Robert Bosch LLC. Mr. Hannemann leads Bosch’s windshield-wiper patent enforcement campaign. Over the last eight years Bosch has defended its beam-blade market by enforcing its U.S. windshield-wiper patents against competitors large and small.  The public portion of the campaign has involved more than 15 District Court infringement litigations as well as an ITC investigation, all of which were resolved successfully for Bosch (one litigation is ongoing).  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. Mr. Hannemann has also handled numerous defense matters for Bosch over the last fifteen years, including District Court litigations and an ITC investigation.
  • Volkswagen and Audi.  Mr. Hannemann works with the Kenyon team that has successfully defended the Volkswagen Group in numerous patent litigations.  Kenyon’s victories for VW have come on summary judgment, via bench trial, via jury trial, in the Patent Office, and on appeal—often in combination.  For example, in an Eastern District of Texas infringement case, Mr. Hannemann and the Kenyon team won summary judgment on liability issues and a bench trial on standing issues.  Those rulings were affirmed on appeal.  In another Eastern District of Texas case, Mr. Hannemann and the Kenyon team obtained a jury verdict that did find liability, but awarded only a very small fraction of the damages that plaintiff Affinity had sought.  The case was resolved minutes before the parties’ cross-appeals were to be heard by the Federal Circuit; Affinity’s litigation campaigns against other defendants continue.
  • Sony.  Mr. Hannemann leads the Kenyon team defending Sony in a patent litigation in the Western District of Texas.  The case involves two patent portfolios.  Working cooperatively with Sony’s co-defendants, the Kenyon team obtained claim-construction rulings that led to a stipulation of non-infringement with respect to one portfolio.  Again in cooperation with Sony’s co-defendants, the Kenyon team 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.  The litigation is ongoing.
  • Smaller companies.  Mr. Hannemann represents smaller companies as well.  For example, Mr. Hannemann led the Kenyon team that succeeded in defeating a motion for preliminary injunction filed by Symbol Technologies in the District of Delaware against its smaller competitor, Janam, which led to a quick resolution of the litigation.  Mr. Hannemann now leads the Kenyon team representing Kangaroo Media in its patent litigation in Pittsburgh against its competitor YinzCam. That litigation is ongoing but has already resulted in a claim-construction ruling in favor of patent-owner Kangaroo.


  • Robert Bosch LLC v. Pylon Manufacturing Corp. Read More
  • MHL Tek, LLC v. Nissan Motor Co. Read More
  • Service Reminder, LLC v. Volkswagen Group of America, Inc. Read More
  • Symbol Technologies, Inc. v. Janam Technologies LLC Read More
  • Goss International Americas, Inc. v. MAN Roland, Inc. and MAN Roland Druckmaschinen AG Read More
  • Harold G. Abbey v. Bill Ussery Motors, Inc. et al. Read More
  • View All

Insights and News




  • Columbia University, J.D., 1995
  • Grinnell College, Physics, B.A., 1992

Bar and Court Admissions

  • New York
  • U.S. District Court for the Southern District of New York
  • U.S. Court of Appeals for the Second Circuit
  • U.S. Court of Appeals for the Federal Circuit

Professional Organizations

  • Mr. Hannemann 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.