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Yisun Song

Hunton Andrews Kurth LLP

Yisun Song’s practice focuses on intellectual property matters, including patent litigation, portfolio analysis and patent prosecution.

Yisun’s practice focuses on all aspects of intellectual property law including patent prosecution, patent litigation and counseling related to electronics, software, e-commerce, business methods, semiconductors and communications.

Yisun has extensive experience in patent portfolio analysis, management and counseling.

Yisun is registered to practice before the U.S. Patent & Trademark Office and prior to joining the firm, worked at the Patent Trademark Office as a patent examiner.

In this role, Yisun examined patent applications directed to semiconductor lasers and optical fiber devices.


  • Represented patent owner in a patent infringement case involving encryption technology.
  • Represented accused infringer before the PTAB and Federal Circuit involving claims-processing rules engine technology.
  • Represented university patent owner before the district court and the Federal Circuit in a patent infringement case involving video scaling technology and high-definition displays.
  • Energy Transportation Group, Inc. v. Sonic Innovations, Inc. et al., (D. Del.) and (Fed. Cir.) Represented patent holder in an infringement matter involving hearing aid patents. The jury returned a verdict for client ETG, finding willful patent infringement and awarded damages of $31 million against two defendants. The Federal Circuit affirmed the jury’s verdict and the trial court’s post-trial rulings.
  • Appellate and reexamination counsel for NTP, In re NTP, Court of Appeals for the Federal Circuit, on eight separate appeals from the U.S. Patent and Trademark Board of Appeals and Interferences related to eight patent, resulting in reversal of PTO decision denying seven NTP patents.
  • 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.


  • JD, George Washington University Law School, with honors, 2000
  • BS, Electrical Engineering, University of Maryland, cum laude, 1994


  • District of Columbia
  • Virginia
  • US Patent and Trademark Office


Rate : $$$

What types of cases Attorney Yisun Song & Hunton Andrews Kurth LLP can handle?
Hunton Andrews Kurth LLP can handle cases related to laws concerning Litigation, Business, Intellectual Property, Trademark infringement. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Hunton Andrews Kurth LLP located?
Hunton Andrews Kurth LLP is located at The Avenue, 2200 Pennsylvania Ave NW, Washington, DC 20052, USA. You can reach out to Hunton Andrews Kurth LLP using their phone line 202 955 1966. You can also check their website or email them at
How much would it cost to hire Hunton Andrews Kurth LLP?
Yisun Song lawyer charges are specific to each case. However, they work with contingency fees and its ranges from $$ to $$$. They also provide free consultation [and no obligation quotes] if you are interested to hire.
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Hunton Andrews Kurth LLP
The Avenue, 2200 Pennsylvania Ave NW, Washington, DC 20052, USA
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