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Gary Gillen FULL.jpg

Gary R. Gillen, Esq.


direct: 630.286.7624  main: 773.570.3330  fax: 773.570.3328  


Practice Groups & Technologies: Patent Prep & Prosecution; Patent Counseling & Post-GrantComputers, Software, & Business MethodsElectronics, Semiconductors, & Optics

Mechanical Devices;

Office: Chicago


Gary 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 Klintworth & Rozenblat IP, 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.



■ 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


 Wireless Networks

 Medical Devices

 Computer Controlled Systems

 Dental Devices

 Software Processes

 Military Systems

 Business Methods


 Optical, Laser and Microwave

 Ballistic Body Armor

 Magnetic Resonance Imaging

 Printing Press Technology

 NMR Spectroscopy

 Credit Card Production

 Aerospace Technologies


 Computer Objects and Models

 Consumer Products

 Neural Networks

 Voice Data and Video

 Scientific Instrumentation

 Industrial Equipment


■ J.D., The John Marshall Law School

■ B.S., Biomedical Engineering (Electrical Engineering and Computer Science Department), Marquette University


McCracken & Gillen LLC


■ Admitted to practice law before the Supreme Court of Illinois

■ Admitted to practice before the U.S. Court of Appeals for the Seventh Circuit, the U.S. Court of Appeals for the Federal Circuit, the U.S. District Court for the Northern District of Illinois, the U.S. District Court for the Western District of Michigan, the U.S. District Court for the Northern District of California, the U.S. District Court for the Middle District of Florida, and the U.S. District Court for the Northern District of Texas
■ Registered Patent Attorney before the U.S. Patent and Trademark Office

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