Jeffrey S.Messing (Jeff)


Chicago + 1.312.269.1542

Jeff Messing represents domestic and international companies on a variety of intellectual property matters, with a primary focus on patent litigation in district courts across the country and post-grant proceedings at the U.S. Patent Office. Jeff's litigation experience spans a variety of technologies across multiple industries such as telecommunications, electronic circuits, medical devices, child care, and pharmaceuticals. He has experience in all stages of discovery, including working with technical experts, research, and motion practice.

Jeff maintains an active pro bono practice and represents tenants facing eviction. He also has experience in applications, manufacturing, and MEP engineering gained from working during his undergraduate education.


  • Home Depot wins ITC trial in patent litigation relating to filament LED technologyJones Day successfully defended The Home Depot, Inc. before the International Trade Commission (ITC) against multi-patent litigation asserted by The Regents of the University of California.
  • Ability Opto-Electronics resolves patent infringement dispute relating to computer camera lensesJones Day defended Taiwan-based Ability Opto-Electronics Technology Co., Ltd. in a patent infringement lawsuit filed by its competitor Largan Precision Co., Ltd., in a case relating to optical lens systems for cameras and computers.
  • Itron defeats patent infringement lawsuit relating to data transmission technologyJones Day obtained dismissal of a patent infringement case brought against Itron prior to the exchange of discovery.
  • Lennox secures voluntary dismissal of complaint accusing iComfort S30 Smart Hub system of infringementOn behalf of Lennox Industries Inc., Jones Day obtained voluntary dismissal of a patent infringement lawsuit after identifying strong non-infringement positions.
  • Salvadoran woman and son obtain asylum due to persecution by MS-13 gangJones Day has secured asylum for client G and her minor son, who were threatened by gang members due to their relationship to a police officer.
  • Qualcomm defends against Apple's patent infringement claims relating to processor power saving techniquesJones Day is defending Qualcomm Incorporated against Apple, Inc.'s allegations that Qualcomm's Snapdragon processors – CPU/GPU/Baseband Modem System on Chip – infringe a number of Apple's patents directed to power saving techniques for use in processors.