Yisun practices all aspects of intellectual property law, including patent prosecution, portfolio analysis, and patent and trade secret litigation. IAM Patent has said she “brings unique insight into the prosecution and protection of semiconductor lasers and optical fibre devices and is a ‘valued partner’ to her loyal clients” (2024) and called her a “well rounded practitioner” who leverages her prior experience working as an examiner at the US Patent and Trademark Office (USPTO) “to draft robust patent applications” for her clients (2023). Yisun has broad experience in patent portfolio analysis, management, and counseling. Her subject matter knowledge is wide-ranging, and includes electronics, software, blockchain and digital assets, artificial intelligence (AI) / machine learning (ML), semiconductors, optical fiber devices, and communications.

Bar Admissions

Education
JD, The George Washington University Law School, with honors, 2000

BS, Electrical Engineering, University of Maryland, cum laude, 1994

• Energy Transportation Group, Inc. v. Sonic Innovations, Inc. et al. (D. Del., 2008) Represented patent holder in an infringement matter involving hearing aid patents. The jury returned a verdict for client ETG, finding willful patent infringement and awarding damages of $31 million against two defendants.
• ePlus vs. SAP AG and SAP America, Inc. (E.D. Va.) Represented patent owner ePlus in infringement action involving electronic procurement systems. Following a four week trial, the case was favorably settled while awaiting the court's decision.
• Represented major banking and financial services institution in infringement matter involving payment systems and verification techniques. The case was favorably settled following the completion of fact discovery.
• Prepared and prosecuted patent applications in the electrical arts, including inventions relating to wireless communications, digital signal processing systems, computer network systems, optical telecommunication devices, computer software algorithms, integrated circuit devices and search engines.
• Prepared and prosecuted patent applications in the financial industry, including inventions relating to card products, check processing, financial algorithms, investment products, healthcare applications and database management.
• Rendered opinions concerning the infringement, validity and enforceability of patents.
• Prepared and negotiated intellectual property license agreements.
• Conducted due diligence review for acquisition of patent portfolios.
• Participated in complex patent prosecution, including petitions, appeals, re-examinations and reissues.

• 2013 Eastern District of Virginia Intellectual Property Year In Review
• 2014 Eastern District of Virginia Intellectual Property Year In Review
• 2016 Eastern District of Virginia Intellectual Property Year in Review
• 2015 Eastern District of Virginia Intellectual Property Year in Review
• 2012 Eastern District of Virginia Intellectual Property Year In Review