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Sandra A. Frantzen


Sandra Frantzen practices a broad range of intellectual property law focusing on patent, trademark and copyright litigation, and client counseling. Recognized in the Law Bulletin's list of "40 Illinois Attorneys Under 40," Sandra has extensive litigation and consulting experience in various industries but has particular expertise in the medical device, pharmaceutical, chemical and biotechnology industries. 

Ms. Frantzen is a trial attorney and litigator who focuses on assisting clients with resolving worldwide intellectual property disputes. Serving as lead trial counsel on behalf of a wide range of clients including both start-up and Fortune 500 companies, Ms. Frantzen's work for clients has ranged from small cases to cases involving damages in the hundreds of millions.  Ms. Frantzen participates in all aspects of dispute resolution from pre-litigation consultation to trial and appellate work.  Her work includes assessing and reviewing the legal issues surrounding clients’ technologies, formulating litigation and dispute resolution strategy, appearing and arguing in court, preparing for and participating in jury trials and arbitration proceedings, spearheading mediation and settlement sessions, and working with witnesses and experts. Ms. Frantzen has appeared on behalf of clients in federal courts throughout the country and has also managed worldwide litigations alongside OUS counsel. One client from an international biotechnology company stated, “Sandra was absolutely instrumental in the successful defense and resolution of this case that was, quite literally, ‘bet-the-company' litigation. This experience led my company to work with Sandra on multiple other matters, and she has never failed to deliver. Having worked with and against some of the best lawyers our profession has to offer, I can unequivocally say that Sandra is among the elite of the elite. As a client and as a professional colleague, this is one lawyer that I definitely want on my side of the table." 

A member of the Patent Bar and registered to practice before the U.S. Patent Office, Ms. Frantzen is well-versed in handling proceedings with the U.S. Patent Office and has been lead counsel in several inter partes review proceedings. Recently, Ms. Frantzen received four favorable Final Written Decisions by the Patent Trial and Appeal Board after a full trial on the merits.  

Ms. Frantzen also regularly advises clients on strategic IP development, acquisition, protection and enforcement with a focus on value. Among other things, she has experience evaluating patents and patent portfolios, drafting and negotiating license and manufacturing agreements, consulting regarding licensing matters, performing due diligence review and analysis of intellectual property rights for corporate acquisitions and mergers, and assisting clients in obtaining patents, copyright, and trademark registrations. Ms. Frantzen has also served as lead IP counsel assisting clients in corporate acquisitions.   

Ms. Frantzen graduated from Iowa State University with high distinction with B.S. degrees in Chemistry and Environmental Science, and received her law degree from The University of Chicago Law School in 1999, where she also graduated with honors.

Representative Litigation Matters

  • Orthophoenix v. Stryker Corp.; Stryker Corp. v. Orthophoenix, LLC, IP Navigation Group, LLC, Medtronic Inc., Civil Action No. 13-1628-LPS (D. Del.)
  • Wyeth and Cordis et al v. Abbott Labs. et al, Civil Action Nos. 08-230 and 08-1021 (D.N.J.)
  • Cordis Corp. v. Abbott Labs. et al, Civil Action Nos. 07-2265, 07-2477, 07-2728, and 07-5636 (D.N.J.)
  • Minkus Elec. Display Sys., Inc. v. ADTI Media et al, Civil Action No. 10-666 (D. Del.)
  • American Medical Sys. et al v. Biolitec et al, Civil Action No. 08-30061 (D. Mass.)
  • American Medical Sys. et al v. Laser Peripherals, LLC, Civil Action No. 08-4798 (D. Minn.)
  • Osteotech, Inc. v. RTI Biologics, Civil Action No. 06-4249 (D.N.J.)
  • Abbott Labs. et al v. Johnson & Johnson et al, Civil Action No. 06-613 (D. Del.)
  • ZIH Corp. v. Paxar Corp., Civil Action No. 03-12358 (D. Mass.)
  • Paxar Americas, Inc. v. Zebra Techs. Corp. et al, Civil Action No. 03-142 (S.D. Ohio)
  • Broadcom Corp. v. Agere Sys., Inc., Civil Action No. 04-0066 (W.D. Wis.)
  • Norian Corp. v. Stryker Corp., Civil Action No. 01-0016 (N.D. Cal.)
  • Z Kat, Inc. et al v. Stryker Corp. et al, Civil Action No. 03-0463 (M.D. Tenn.)
  • Haggerty Enterprises, Inc. v. Creative Motion Indus., Inc., Civil Action No. 02-8578 (N.D. Ill.)
  • Amsted Indus. Inc. v. Buckeye Steel Castings Co., Civ. No. 01-3336 (N.D. Ill.)
  • Amsted Indus. Inc. v. ABC-NACO, Inc., Civ. No. 00-7119 (N.D. Ill.)
  • University of Washington v. Optiva Corp. (Arbitration Proceedings)
  • Advanced Cardiovascular Systems, Inc. v. SciMed Life Sys., Civ. No. 96-00946 (N.D. Cal.)

Recent Honors & Awards

  • Celebrating Women in the Legal Profession Honoree, 2016
  • 40 Illinois Attorneys Under 40 to Watch, 2014
  • Building Bridges award with Decalogue Society Of Lawyers, 2016
  • Top Women Attorneys in Illinois, as recognized in Chicago magazine by Super Lawyers, 2013
  • Illinois Rising Star, Super Lawyers, 2008-2013

Professional & Community Involvement

  • Member of Intellectual Property Owner's Litigation Subcommittee
  • President of the Arab American Bar Association of Illinois
  • Member of the Women’s Advisory Council for the Chicago Daily Law Bulletin and Chicago Lawyer
  • Participated in the McAndrews’ Professional Development Committee and the firm’s Recruiting and Diversity Committees

Recent Presentations/Speaking Engagements

  • "Women in Law Conference", Chicago Lawyer, December 2018
  • “Cross-National Patent Litigation: Leveraging a Global Patent Portfolio”, Centerforce IP Strategy Conference, June 2018
  • "Arendi v. Apple:  The Role of “Common Sense” In Assessing Obviousness," McAndrews IP Symposium, September 2016
  • "The Best Is Yet To Come: Significant Changes to the AIA Post Grant Proceedings," The Knowledge Group, January 2016
  • "Hot Topics in the Pharmaceutical Space," McAndrews IP Symposium, panel mederator, June 2015
  • "Incorporating Inter Partes Review and New USPTO Procedures into Branded and Biosimilar Litigation Strategies," ACI Summit on Biosimilars, Munich, Germany, April 2015
  • "Post-Issuance Review, Development and Procedures," McAndrews IP Symposium, Chicago, panel moderator, July 2014
  • "Intellectual Property and Biosimilars: Key Consideration," BIT's 6th International Congress of Antibodies, Dalian, China, April 2014
  • “Biosimilars in the United States: FDA and the Biologics Price Competition & Innovation Act,” Informa Biosimilars Conference, Istanbul, Turkey, November 2013
  • “Section 112: Complying with the Written Description and Enablement Requirements,” McAndrews IP Symposium, Chicago, October 2013
  • “Practical Claim Drafting & Patent Prosecution: Strategies for Biosimilars and Innovators,” ACI Biosimilars Conference, New York, June 2013
  • “Revolutionizing Medical Device Patent Prosecution and Litigation Strategies Post-Patent Reform,” ACI Medical Device Patents Conference, Chicago, March 2013
  • "Intellectual Property: Protecting and Preserving Your Ideas," presented at the request of U.S. State Department (Jordan Embassy), telecast in Jordan, April 2012


  • Settlement Negotiations May Not Be Confidential, Executive Counsel (Feb/Mar 2012) View File
  • Embracing the Differences – How Diversity In Litigation Can Help You Win, Intellectual Property Today (May 2007) 

Areas of Practice


Bar Admissions / Registrations

  • Illinois
  • U.S. District Court for the Northern District of Illinois (including Trial Bar)
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. Patent and Trademark Office


  • University of Chicago, J.D., with honors, 1999
  • Iowa State University, B.S. Chemistry, B.S. Environmental Science, with highest distinction, 1996