Sufan Zheng
Overview
Sufan is an associate in the firm's Chicago office, focusing on intellectual property law, including patent litigation and prosecution. With a robust technical background and experience in multiple technical disciplines, she serves global clients across diverse industries, offering tailored legal solutions.
Career & Education
- Student Associate, Law and Entrepreneurship Clinic: University of Wisconsin Law School, 2023
- Research Assistant: Tsinghua University, 2019–2022
- University of Wisconsin – Madison, J.D., 2025
- Tsinghua University, M.Eng., Materials Engineering, 2022
- Fudan University, B.S., Material Physics, 2019
- Illinois
- Wisconsin
- Mandarin
Sufan's Insights
Client Alert | 6 min read | 11.26.25
From ‘Second’ to ‘First:’ Federal Circuit Tackles Obvious Claim Errors
Patent claims must be clear and definite, as they set the boundaries of the patentee’s rights. Occasionally, however, claim language contains errors, such as typographical mistakes or incorrect numbering. Courts possess very limited authority to correct such errors. The United States Court of Appeals for the Federal Circuit has emphasized that judicial correction is appropriate only in rare circumstances, where (1) the error is evident from the face of the patent, and (2) the proposed correction is the sole reasonable interpretation in view of the claim language, specification, and prosecution history. See Group One, Ltd. v. Hallmark Cards, Inc., 407 F.3d 1297, 1303 (Fed. Cir. 2005) and Novo Indus., L.P. v. Micro Molds Corp., 350 F.3d 1348, 1357 (Fed. Cir. 2003).
Sufan's Insights
Client Alert | 6 min read | 11.26.25
From ‘Second’ to ‘First:’ Federal Circuit Tackles Obvious Claim Errors
Patent claims must be clear and definite, as they set the boundaries of the patentee’s rights. Occasionally, however, claim language contains errors, such as typographical mistakes or incorrect numbering. Courts possess very limited authority to correct such errors. The United States Court of Appeals for the Federal Circuit has emphasized that judicial correction is appropriate only in rare circumstances, where (1) the error is evident from the face of the patent, and (2) the proposed correction is the sole reasonable interpretation in view of the claim language, specification, and prosecution history. See Group One, Ltd. v. Hallmark Cards, Inc., 407 F.3d 1297, 1303 (Fed. Cir. 2005) and Novo Indus., L.P. v. Micro Molds Corp., 350 F.3d 1348, 1357 (Fed. Cir. 2003).
