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About me

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

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Practice areas


  1. Patent Infringement: 85%
    21 years, 110 cases
  2. Intellectual Property: 15%
    21 years

Attorney endorsements

2 total 

Are you an attorney? Endorse this lawyer

  • David Arthur Skeels

    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.


    David Skeels Patent infringement Attorney
    Relationship: Worked together on matter

  • Michael R Laporte

    Rob is one of the smartest and hard working attorneys I've had the pleasure of working with.


    Michael Laporte Patent infringement Attorney
    Relationship: Co-worker

Contact info

Flachsbart & Greenspoon, LLC

333 North Michigan Avenue
27th Floor
Chicago, IL, 60601


ILActive And Authorized To Practice Law199505/11/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Illinois 2012 Super Lawyer, Intellectual Property LitigationSuper Lawyers2012
Illinois Rising Star 2010Super Lawyers2010
"Small Claims" Article Republished in Patent Law ReviewThomson-West2010
Illinois Rising Star 2009SuperLawyers2009
Peer Review Rated LawyerMartindale Hubbell2007
Work experience
TitleCompany nameDuration
MemberFlachsbart & Greenspoon, LLC2007 - Present
ShareholderNiro, Scavone, Haller & Niro1996 - 2007
Law Clerk to the Honorable Brian Barnett DuffUnited States District Court, Northern District of Illinois1995 - 1996
Association namePosition nameDuration
University of Chicago Alumni in Law Networking GroupCo-chair2009 - Present
Chicago Bar AssociationMember2007 - Present
American Intellectual Property Law AssociationMember2007 - Present
Chicago Council of LawyersMember2007 - Present
Chicago Committee for the Chicago Society, University of ChicagoChair2009 - 2010
Chicago Committee for the Chicago SocietyMember2007 - 2009
Anchor Graphics NFPChair2000 - 2006
Legal cases
Case nameOutcome
1st Media v. Electronic ArtsArgued 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
See all legal cases 
Publication nameTitleDate
Columbia Science and Technology Law ReviewDon't Assume a Can Opener: Confronting Patent Economic Theory with Licensing and Enforcement Reality2011
Minnesota Journal of Law, Science and TechnologyIs the United States Finally Ready for a Patent Small Claims Court?2009
Intellectual Asset Management MagazineObviousness after KSR v. Teleflex: A Private Practice Perspective2007
IP LitigatorAre Patent Trolls Really Undermining the Patent System?2006
School nameMajorDegreeGraduated
University of Michigan Law SchoolLawJD - Juris Doctor1995
University of ChicagoPhysicsA.B.1992
Speaking engagements
Conference nameTitleDate
DePaul College of LawRoundtable Discussion of Supreme Court case Microsoft Corp. v. i4i Limited Partnership2011
Patentable Subject Matter After the Supreme Court Bilski OpinionPatentable Subject Matter2010
Patent Prosecution and Litigation after In Re BilskiPatentable Subject Matter2010
University of Chicago Science and Technology Immersion CampScience Careers in Law2008