Patent Counsel

Arent Fox's patent law blog examines the latest news, trends, and legal developments in the patent world.

Patent Counsel

Sungyong (David) In

Sungyong In, Associate at Arent Fox
Sungyong (David) In
Washington, DC

Sungyong (David) is an associate and registered patent attorney in the firm's Intellectual Property group. He has extensive experience in telecommunications, software, semiconductor, and electrical technologies.

Client Work

Sungyong’s practice is focused on counseling clients and prosecuting patent applications in the electrical fields, including telecommunications, software, computer hardware, and semiconductor device manufacturing. Sungyong advises clients regarding the protection of their intellectual property, including the preparation of patentability, infringement and validity opinions, and due diligence studies. Sungyong also has substantial experience in post-grant review proceedings, including preparing reexamination requests and defending patents undergoing ex parte and inter partes re-examination.

Previous Work

Prior to joining Arent Fox, Sungyong was an associate at a large international firm, with his practice focusing on patent prosecution, patent transaction, the preparation of patentability, infringement and validity opinions, due diligence studies, re-examination (both ex parte and inter partes re-examination proceedings), and post-grant proceedings.

While in law school, he was a law clerk at the US International Trade Commission's Office of Unfair Import Investigations.

Before becoming a patent attorney, over 10 years Sungyong worked as a systems engineer, a research and development engineer, and program/project manager in the automotive, digital telecommunications, and semiconductor industries.

Professional Activities

Sungyong is a member of the American Bar Association and the Korean-American Scientists and Engineers Association.


Blog Posts by Sungyong (David) In

Post-Grant Proceedings, Inter-Partes Review
USPTO’s Decision to Not Institute Inter Partes Review of a Patent is Final and Nonappealable

Addressing 35 U.S.C. § 314(d), the US Court of Appeals for the Federal Circuit (the Federal Circuit) determined that, in recent precedential orders in inter partes review proceedings, the Federal Circuit does not have authority to hear appeals of the United States Patent & Trademark Office (USPTO) decisions to not institute inter partes review of an issued patent. St. Jude Medical v. Volcano Corporation (Fed. Cir. Order, April 22, 2014) (Prost, O’Malley, Taranto, J.).

In 2010, St. Jude Medical, Cardiology Division, Inc. (St. Jude) sued Volcano Corporation (Volcano) in the United States District Court for the District of Delaware, alleging infringement of five St. Jude patents. Subsequently, Volcano filed a counterclaim against St. Jude asserting infringement of one of its patents, U.S. Patent No. 7,134,994 (the ‘994 patent). In October 2012, based on parties’ stipulations, the district court dismissed all claims relating to the ‘994 patent.

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Arent Fox LLP, founded in 1942, is internationally recognized in core practice areas where business and government intersect. With more than 350 lawyers, the firm provides strategic legal counsel and multidisciplinary solutions to clients that range from Fortune 500 corporations to trade associations. The firm has offices in Los Angeles, New York, San Francisco, and Washington, DC.