John Mariane is an associate in the Electrical & Computer Technologies practice group. His practice focuses on helping clients to protect their intellectual property, particularly complex electrical inventions and emerging technologies. As a patent attorney, John drafts patent applications and provisional patent applications, responds to office actions, files appeal briefs before the U.S. Patent Trial and Appeal Board, and handles reissuance matters. He has also handled licensing, agreements, trademark cases, and copyright litigation cases. 

Representative Experience

For companies and inventors, John provides counsel on:

  • Contract disputes
  • Licensing agreements
  • Patent infringement
  • Patent portfolio management
  • Trademark and patent prosecution 

Background and Credentials

John started his legal career at Chicago area intellectual property law firms prior to joining Marshall Gerstein. He completed his undergraduate degree in History with a minor in Physics from Loyola University Chicago. He then earned his law degree from Loyola University Chicago School of Law. He is proficient in multiple computing languages, including Python, C, C++, Java, and Unix and is expected to complete his Masters of Science in Computer Science with DePaul University in May 2025. John is conversant in Japanese after living and studying in Tokyo, Japan.


  • Loyola University Chicago School of Law (J.D.)
    • Certified in International Law
  • Loyola University Chicago (B.A.)
    • History

Bar Admissions

  • Illinois
  • U.S. District Court, Northern District of Illinois
  • U.S. Patent and Trademark Office
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