Darren S. Cahr

darren.cahr dbr.com
Phone: (312) 569-1465 (312) 569-1465
Fax: (312) 569-3465


Darren S. Cahr counsels clients and litigates disputes relating to intellectual property and marketing practices. He provides critical advice and representation in connection with infringement claims, the protection of intangible assets, competitive positioning, branded communications, and the legal implications of new technology. Darren litigates and tries cases in courts around the nation and before administrative agencies, dispute resolution forums and self-regulatory bodies. In addition, Darren serves as co-chair of the firm's Advertising and Promotions Team.

Darren is a widely published author on topics of law, social media, and popular culture, a novelist, a musician, and an active member of several professional organizations. His highly praised presentations on the intersection of legal ethics and social media have been featured by two major bar organizations at their annual meetings. He also regularly speaks on issues involving new media and intellectual property throughout the country and around the world, and can be found on twitter @legallysocial.

Darren has been recognized by World Trademark Review magazine as a “marque and product design maestro.” Past reviews have lauded his ability to deliver "smart, thorough and fast" counsel to clients, described him as “a wonderful trial lawyer with a firm grasp on the law,” and noted that he is a “nationwide thought leader on the interface between social media and intellectual property.”


  • Won significant trial victory before the International Trade Commission, successfully defending global oral care company in large-scale, competitor dispute. In Re Certain Dental Ceramics, Products Thereof, and Methods of Making the Same, 83 FR 66303 (2018)
  • Successfully obtained temporary restraining order in contentious trademark infringement dispute after full evidentiary hearing in Venus Laboratories, Inc. v. Vlahakis et al, No. 1:2015-cv-01617 (N.D. Ill. 2015)
  • Obtained summary judgment in defense of false advertising, false designation of origin, and trade secret claims after extensive fact and expert discovery in Alpha Pro Tech, Inc. v. VWR International LLC, No. 2:12-cv-01615 (E.D. Pa. 2017)
  • Successfully argued appeal, after oral argument, overruling trademark application refusal on novel specimen issue in In re Johnson & Johnson, Serial No. 85286071 (T.T.A.B. 2015)
  • Won complex product configuration trade dress infringement action at trial, upheld on appeal, in Bobrick Washroom Equipment v. American Specialties (C.D. Cal. 2012)
  • Successfully obtained consent judgments in parallel importation cases in Trademark Holdings of Illinois v. AR Dental (E.D. NY 2009) and Trademark Holdings of Illinois v. King’s Two Dental Supply (C.D. Cal. 2009)
  • Won high-profile copyright infringement action relating to protection of science fiction tropes in films and video games in Crawford et al. v. Midway Games Inc., et al, 2:07-cv-00967 (C.D. Cal. 2008)
  • Successfully represented major consumer products companies before nation’s premier advertising industry self-regulatory forums, National Advertising Division and Children’s Advertising Review Unit
  • Advised well-known environmentally conscious consumer products company on marketing practices and social media
  • Counseled a number of major insurance companies on intellectual property issues and marketing practices
  • Advised major national retailer on copyright and trademark issues, and successfully resolved a series of high-profile infringement disputes pre-litigation
  • Coordinated international branding efforts with global network of foreign counsel for major life sciences company
  • Reviewed and cleared major comparative advertising campaign for well-known national restaurant chain
  • Counseled life-sciences companies on product packaging and legal risks emerging from parallel importation and counterfeiting
  • Reviewed and designed legal framework for cutting-edge online promotions, including sweepstakes, contests, and other marketing practices
  • Advised major toy and hobby company on copyright, trade secret, and trademark issues


World Trademark Review 1000 (2019)

Awards Methodology (www.drinkerbiddle.com/content/awards)


Bar Admissions

  • Illinois


  • Northwestern University, J.D., 1993
  • Northwestern University, B.A., 1990

Court Admissions

  • U.S. Supreme Court
  • U.S. Court of Appeals, Federal Circuit
  • U.S. Court of Appeals, Seventh Circuit
  • U.S. Court of Appeals, Ninth Circuit
  • U.S. District Court, Central District of Illinois
  • U.S. District Court, Northern District of Illinois, Trial Bar


  • American Bar Association, Litigation Section and Intellectual Property Section
  • Brand Activation Association
  • Chicago Council on Global Affairs
  • Intellectual Property Owners Association, Domain Names and Social Media Committee
  • International Trademark Association, Unfair Competition Committee