Leonard (Lenny) Friedman
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Leonard Friedman

200 West Madison Street Suite 2700
Chicago, IL 60606
lfriedman@hahnlaw.com 312.637.3005


Leonard Friedman understands the value of innovation and the protection of intellectual property. Lenny is an experienced patent prosecution and intellectual property attorney, who is also a registered professional engineer.

Lenny provides clients in the technology, software, transportation and manufacturing industries with insights into specific matters related to each industry. His experience includes securing patents regarding technology and software, including the transmission of multimedia content, drafting legal memoranda for filing in intellectual property litigation matters and drafting briefs for intellectual property litigation.

Prior to beginning his profession in the legal field, Lenny worked as an electrical engineer on the lunar module and the F-14 fighter aircraft at Grumman Aerospace Corp. He also spent more than four years working on primary plant instrumentation for the 688-class submarine while on Admiral Hyman G. Rickover’s staff as a member of the U.S. Navy’s nuclear propulsion program.

  • Secured patents on energy conservation technology on behalf of a Fortune 100 commercial manufacturing company.
  • Obtained patents on multimedia content delivery for a Fortune 100 software company.
  • Secured patents on cell phone antenna technology on behalf of a multinational telecom company.
  • Secured patents on automatic contact center technology for a technology company.



George Washington University Law School, LL.M., Intellectual Property, 1997


University of Chicago Law School, J.D., 1979


University of Rochester, B.S., Electrical Engineering, 1971

Memberships & Affiliations

The Decalogue Society of Lawyers, Member


American Intellectual Property Law Association, Member


Chicago Bar Association, Member


Federal Circuit Bar Association, Member


Intellectual Property Law Association of Chicago, Member

Bar Admissions

State of Illinois, 1979


U.S. Courts of Appeals for the Armed Forces, 1980, the Federal Circuit, 1993, and the Seventh Circuit, 1994; U.S. Supreme Court, 1987; U.S. Patent and Trademark Office, 1993; U.S. District Courts for the Northern District of Illinois, 1994, and Eastern District of Wisconsin, 1995; U.S. Claims Court, 1995


Registered Professional Engineer, Virginia