Gary R. Gillen

phone: 630-286-7624

Gary is a founding member of our Firm and has practiced intellectual property law for over 20 years. His practice focuses on complex patent prosecution, portfolio management, product clearance, patent related opinions, and intellectual property litigation.

Gary develops an in depth understanding of his clients’ business and technology to identify and manage their intellectual property assets. He provides counsel on matters relating to patent procurement, infringement and validity analysis, M&A due diligence, claim constructions, internal patent programs, licensing, and conflict avoidance, enabling clients to make strategic business decisions.

Gary’s patent practice is complemented by his considerable intellectual property litigation experience. He has been a start to finish advocate in over twenty-five patent, trademark, copyright, and trade secret litigation matters. His more high profile cases have been highlighted in such publications as The Wall Street Journal and the Chicago Tribune.

Gary represents emerging growth, mid-market and Fortune 500® companies in a wide range of software, electrical, mechanical, and electro-mechanical technologies. He also represents universities and research organizations regarding their leading innovations, including obtaining patent protection for a Nobel Prize winning inventor on behalf of a premier Midwestern university.

In addition to his litigation experience in Federal Court, Gary has experience representing and counseling clients in post grant matters such as inter partes review (IPR) proceedings before the Patent trial and Appeal Board (PTAB).

Prior to joining McCracken & Gillen, Gary was a partner at both a national IP law firm and a national full-service law firm. Gary received his engineering degree from Marquette University with a biomedical engineering focus within the electrical engineering and computer science department, and was a recipient of a four year full Evans Scholarship from the Western Golf Association.


J. D. – The John Marshall Law School
B. S. – Biomedical Engineering (Electrical Engineering and Computer Science Department), Marquette University

Bar Admissions

State of Illinois

U.S. District Court, Northern District of Illinois
U.S. District Court, Northern District of California
U.S. District Court, Western District of Michigan
U.S. District Court, Middle District of Florida
U.S. District Court, Northern District of Texas

U.S. Court of Appeals, Seventh Circuit
U.S. Court of Appeals, Federal Circuit

U.S. Patent and Trademark Office

Professional Associations

Intellectual Property Law Association of Chicago (IPLAC)
American Intellectual Property Law Association (AIPLA)
Intellectual Property Owners Association (IPO)
Chicago Intellectual Property Alliance
Evans Scholars Bar Association
Association of University Technology Managers

Technological areas of his practice include:

  • Wireless Networks
  • Medical Devices
  • Computer Controlled Systems
  • Dental Devices
  • Software Processes
  • Military Systems
  • Business Methods
  • Automotive
  • Optical, Laser and Microwave
  • Ballistic Body Armor
  • Magnetic Resonance Imaging
  • Printing Press Technology
  • NMR Spectroscopy
  • Credit Card Production
  • Aerospace Technologies
  • Firearms
  • Computer Objects and Models
  • Consumer Products
  • Neural Networks
  • Voice Data and Video
  • Scientific Instrumentation
  • Industrial Equipment