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Robert Philip Greenspoon

Patent infringement Attorney at Chicago, IL

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About Robert

Learn Robert’s areas of practice.

Practice areas
  1. Patent infringement
    I prosecute and defend patent cases across the country for national and international clients.

    28 years, 110 cases

  2. Intellectual property
    Litigation and counseling in copyright, trademark, trade secret and related contract and business tort matters; and patent prosecution in the United States Patent and Trademark Office.

    28 years

I am a founding member of Flachsbart & Greenspoon, LLC. A registered patent attorney, I concentrate my practice in the litigation and trial of patent cases involving computer and electronic technologies. I have held primary litigation responsibility in matters grossing tens of millions of dollars in aggregate recoveries since 1996. I have also successfully defended against multimillion dollar claims while representing accused infringers. My cases have involved computer, computer network and electronic technologies of the highest complexity, but also simple mechanical devices.

I have argued numerous cases before the Court of Appeals for the Federal Circuit. At 29 years old, I became possibly the youngest attorney to argue successfully for a patentee-appellant in a multimillion dollar patent case (IMS Technology, Inc. v. Haas Automation, Inc., 206 F.3d 1422, 1430 (Fed. Cir. 2000)). I successfully argued HyperPhrase Technologies LLC v. Google, Inc. (Case No. 2007-1125), obtaining a ruling on December 26, 2007 vacating-in-part a lower court decision to throw out a patent case against Google. Most recently, I successfully argued 1st Technology v. Rational Enterprises (Case No. 2008-1132), obtaining an affirmance without opinion on October 8, 2008 which preserved a $50 million default judgment against Bodog, the online gaming company. I served in 1995-1996 as a judicial law clerk to the Honorable Brian Barnett Duff of the United States District Court for the Northern District of Illinois. I am a co-author of "Are Patent Trolls Really Undermining the Patent System?" in the September/October 2006 issue of IP Litigator, as well as "Obviousness after KSR v. Teleflex: a Private Practice Perspective" in the August/September 2007 issue of Intellectual Asset Management Magazine. Most recently I wrote "Is the United States Finally Ready for a Patent Small Claims Court," Minnesota Journal of Law, Science and Technology, Vol. 10, Issue 2 (Spring 2009).

Photos and videos

Licensed for 27 years
State IL
Status Active And Authorized To Practice Law
Acquired 1995
Updated 01/06/2023
State MN
Status Resigned
Acquired 1998
Updated 10/29/2022

We have not found any instances of professional misconduct for this lawyer.

Contact Robert

Flachsbart & Greenspoon, LLC
333 North Michigan Avenue
27th Floor
Chicago, IL, 60601


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AVVO RATING 9.7 (Superb)

Work Experience

  • Member
  • Flachsbart & Greenspoon, LLC
  • 2007 - Present
  • Shareholder
  • Niro, Scavone, Haller & Niro
  • 1996 - 2007
  • Law Clerk to the Honorable Brian Barnett Duff
  • United States District Court, Northern District of Illinois
  • 1995 - 1996


  • University of Michigan Law School
  • JD - Juris Doctor
  • 1995
  • University of Chicago
  • A.B.
  • 1992

Legal Cases

  • 1st Media v. Electronic Arts
  • Argued appeal and won reversal for patentee of judgment of inequitable conduct.
  • Lear Corp. v. Johnson Controls, Inc.
  • Won jury verdict and judgment for client.
  • Newegg, Inc. v. Telecommunication Systems, Inc.
  • Case transferred to USDC District of Maryland
View all legal cases


  • University of Chicago Alumni in Law Networking Group
  • Co-chair
  • 2009 - Present
  • Chicago Bar Association
  • Member
  • 2007 - Present
  • American Intellectual Property Law Association
  • Member
  • 2007 - Present
  • Chicago Council of Lawyers
  • Member
  • 2007 - Present
  • Chicago Committee for the Chicago Society, University of Chicago
  • Chair
  • 2009 - 2010
  • Chicago Committee for the Chicago Society
  • Member
  • 2007 - 2009
  • Anchor Graphics NFP
  • Chair
  • 2000 - 2006
View all associations

Honors and Awards

  • Illinois 2012 Super Lawyer, Intellectual Property Litigation
  • Super Lawyers
  • 2012
  • Illinois Rising Star 2010
  • Super Lawyers
  • 2010
  • "Small Claims" Article Republished in Patent Law Review
  • Thomson-West
  • 2010
  • Illinois Rising Star 2009
  • SuperLawyers
  • 2009
  • Peer Review Rated Lawyer
  • Martindale Hubbell
  • 2007
View all awards


  • IP Litigator
  • Are Patent Trolls Really Undermining the Patent System?
  • 2006
View all publications

Speaking Engagements

  • Patentable Subject Matter After the Supreme Court Bilski Opinion
  • Patentable Subject Matter
  • 2010
  • University of Chicago Science and Technology Immersion Camp
  • Science Careers in Law
  • 2008
View all speaking engagements

Attorney endorsements

Received (2)
Given (2)
Endorse Robert
Patent infringement Attorney | Mar 10
Relationship: Worked together on matter
"Mr. Greenspoon has the perfect mix of intellectual horsepower and down-home charisma to make him a valuable weapon in the courtroom and a dear friend outside of it. I would recommend him unconditionally to any intellectual property client who wants smart, aggressive, and wise counsel."
Patent infringement Attorney | Aug 27
Relationship: Co-worker
"Rob is one of the smartest and hard working attorneys I've had the pleasure of working with."
Intellectual property
Patent infringement

Avvo Contributions

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Chicago Patent infringement Lawyer Robert Philip Greenspoon
Robert Philip Greenspoon
Patent infringement Attorney
Chicago, IL
Licensed for 27 years