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.


  • 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.
  • Home Depot defends multi-patent litigation relating to filament LED technologyJones Day is defending The Home Depot, Inc. in multi-patent litigation asserted by The Regents of the University of California in the International Trade Commission and Central District of California.
  • 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.
  • Ability Opto-Electronics defends patent infringement lawsuit relating to computer camera lensesJones Day is defending Taiwan-based Ability Opto-Electronics Technology Co., Ltd. in a patent infringement lawsuit filed by Largan Precision Co., Ltd. relating to camera/optical lenses used in computers.
  • 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.
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