Attorney Bio

"Patent litigation affords me the opportunity to satisfy my two strengths — understanding complex technologies and making that technology accessible to jurors. By doing so, I provide my clients compelling, winning positions."

—John Wittenzellner

John Wittenzellner is a registered patent attorney with experience litigating and prosecuting patents in a variety of fields, including electronics, computer networking and Internet technology, automotive safety devices, semiconductor manufacturing and design, optics, microelectromechanical systems (MEMS), and software.

John’s trial experience includes Markman hearings and deposing and cross-examining difficult expert witnesses. He has experience advocating for clients in the U.S. International Trade Commission (ITC), Patent Trial and Appeal Board (PTAB), and district courts across the country.

John began developing the oral advocacy skills that are critical for an effective patent litigator as a semiconductor engineer, where he interfaced with researchers to understand complex technical issues that pertained to new products and processes being implemented into production. He was then responsible for translating those requirements to manufacturing personnel, and identifying the salient points and why they were important from a manufacturing standpoint.

Today, John’s strength lies in his ability to distill complex technical concepts and facts into a compelling story for judges and juries. He also applies this ability when preparing client expert witnesses to testify, to ensure that their testimony is clear and persuasive. During depositions and cross-examination, John uses his abilities and technical know-how to cut through diversionary tactics to extract clear admissions from opposing expert witnesses.

Education & Bar Admissions


  • George Mason University – Antonin Scalia Law School, J.D., cum laude, 2010
  • Rochester Institute of Technology, B.S. Microelectronic Engineering, 2003

Admitted to Practice

  • Pennsylvania
  • District of Columbia
  • United States Patent and Trademark Office


  • Selected to the Rising Stars list, Super Lawyers (Thomson Reuters), 2015–2020


  • Officer: Philadelphia Intellectual Property Law Association (PIPLA)
John Wittenzellner
Rated by Super Lawyers

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Experience Highlights

  • Won a unanimous $115 million jury verdict against the world’s largest company in a trade secret case over misappropriation of a computer and telecommunications system for reducing the worldwide problem of fresh food waste (E.D. Ark.)
  • Defended an email-marketing company against patents pertaining to mixed-format email; invalidated one of two asserted patents during claim construction under 35 U.S.C. § 112, ¶6 and the Williamson decision (E.D. Tex.)
  • Defended a leading television manufacturer against patents related to video-coding and graphics technology; conducted critical cross examinations of Complainant’s lead expert witness, which resulted in a complete victory for Respondents (ITC)
  • Represented a provider of assistive technology and services for the deaf and hard of hearing on patents related to infrastructure for providing the same; successfully opposed a motion to amend the claims at issue, resulting in invalidation of a key patent in an underlying district court dispute (PTAB) 
  • Represented a manufacturer of touchscreen controllers on its patents covering fundamental touchscreen technology; after deposing the technical expert on claim construction and infringement (and subsequent cross examination), the case settled on favorable terms shortly after the evidentiary hearing (ITC)

Patent Litigation

  • Defended a leading television manufacturer against patents related to semiconductor manufacturing processes and device architecture (ITC)
  • Defended a leading social gaming company against patents related to online computer gaming systems and the ability to provide particular information to the game participant during the gaming experience (E.D. Tex)
  • Defended a leading television manufacturer against patents related to graphics processing unit (GPU) architecture (ITC)
  • Defended a leading television manufacturer against patents related to decoding and scaling television signals from over-the-air broadcasts, including the use of the Viterbi algorithm (E.D. Tex) 
  • Defended the world’s leading PC manufacturer in a case involving noise cancellation technology used with multiple microphone PCs (ITC)
  • Defended a leading electronics manufacturer against patents pertaining to semiconductor manufacturing processes (D. Del.)
  • Defended a leading television manufacturer against claims related to electronic program guides and other user-interface features (ITC)
  • Defended a leading satellite television provider against claims related to digital video recorder (DRV) technology (D. Del.)
  • Representing the world’s largest personal computer company in many cases involving WiFi, WiMax, 3G, 4G and Bluetooth® wireless technologies (E.D. Tex., D. Del.) 
  • Defended 21 of the world’s largest telecommunications companies (six handset manufacturers and 15 wireless carriers) litigating the invention of smartphone technology (E.D. Tex.) 
  • Defended the largest search provider against claims related to image-compression algorithms (E.D. Tex.)
  • Defended a leading automobile manufacturer against claims related to crash detection sensors and algorithms for deploying airbags (E.D. Mich.)
  • Defended a leading automobile manufacturer against claims related to portable media player connectivity (E.D. Tex.)