Isaku M. Begert, Associate

Biography

Isaku is an intellectual property litigator who represents clients in complex patent, trademark, copyright, and commercial disputes. Drawing on his background in mathematics and physics, he analyzes complicated technologies and develops practical litigation strategies aligned with clients’ business objectives.

Isaku has experience across all stages of litigation, including pre-suit investigation, pleadings, fact and expert discovery, claim construction, depositions, dispositive motions, trial preparation, and appeals. He has represented clients in federal district courts, the U.S. Court of Appeals for the Federal Circuit, the International Trade Commission, and the Trademark Trial and Appeal Board. His practice includes disputes involving mechanical and electrical technologies, consumer products, energy and infrastructure systems, software, and internet-based technologies.

Isaku brings a practical, detail-oriented approach to disputes involving products, supply chains, and market access. He regularly analyzes technical documents and accused products, develops claim-construction and infringement positions, works with experts and inventors, and manages large discovery records. His practice also includes appellate briefing, patent-demand and pre-suit counseling, Amazon Patent Evaluation Express proceedings, and strategic assessments of intellectual property risk.

Isaku was selected for inclusion in the 2026 Illinois Rising Stars list by Super Lawyers. He was also selected for the Leadership Council on Legal Diversity’s Pathfinder Program.

Education

  • DePaul University College of Law (L.L.M.)
    • Intellectual Property Law
  • DePaul University College of Law (J.D., magna cum laude)
    • Order of the Coif
  • Cornell College (B.A.)
    • Mathematics, Physics

Bar Admissions

  • Illinois
  • U.S. District Court, Northern District of Illinois
  • U.S. District Court, Eastern District of Wisconsin
  • U.S. Court of Appeals, Federal Circuit

Memberships

  • American Bar Association (ABA)
  • Chicago Bar Association (CBA)
  • The Richard Linn American Inn of Court
  • Intellectual Property Law Association of Chicago (IPLAC)
  • Asian American Bar Association of Greater Chicago (AABA)
  • National Asian Pacific American Bar Association (NAPABA)

Representative Experience

  • Represented clients in patent litigation involving mechanical, electrical, consumer-product, energy, software, and industrial technologies.
  • Drafted dispositive and appellate briefs addressing claim construction, infringement, validity, evidentiary, and procedural issues, including briefing before the Federal Circuit.
  • Managed fact and expert discovery, including preparing written discovery, developing deposition strategy, and taking and defending depositions.
  • Represented clients in ITC investigations and related district-court proceedings involving importation, market-access, and parallel-proceeding issues.
  • Represented clients in trademark opposition proceedings involving priority, likelihood of confusion, actual confusion, and expert discovery.
  • Advised clients concerning patent-infringement demands, pre-suit strategy, patent eligibility, damages exposure, and litigation risk.
  • Managed trademark, copyright, design-patent, and online anticounterfeiting matters for major brands, including emergency injunctive proceedings and dispositive motions.
  • Conducted infringement, invalidity, prior-art, and claim-construction analyses involving complex technical products and systems.

Background & Credentials

Before joining Marshall Gerstein, Isaku represented clients at a large international law firm and a boutique intellectual property firm. His prior work included patent disputes in federal district court and at the ITC, design-patent enforcement, trademark and copyright litigation, online anticounterfeiting actions, and patent prosecution matters.

Isaku received his J.D., magna cum laude, with Order of the Coif honors, from DePaul University College of Law. While completing his J.D., he also received an LL.M. in Intellectual Property Law from DePaul. During law school, he served on the DePaul Law Review and competed in the Philip C. Jessup International Law Moot Court Competition and the Saul Lefkowitz Moot Court Competition. He received CALI Excellence Awards in Trademarks, Food and Drug Law, Advanced Legal Research, and Internet Law.

Before law school, Isaku earned a B.A. in Mathematics with a minor in Physics from Cornell College.

Community & Professional Involvement

  • Leadership Council on Legal Diversity, Pathfinder Program
  • Cabrini Green Legal Aid

Publications and Presentations

Offsite Notice

By clicking “Proceed” below, you will be opening a new browser window and leaving our website.