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Xianfeng Shen, Ph.D.

Xianfeng Shen

Xianfeng Shen, Ph.D., is an associate in Sterne Kessler’s Biotechnology & Chemical Practice Group. He prepares and prosecutes patent applications in a variety of technologies, including inorganic chemistry, organic chemistry, pharmaceuticals, biotechnology, chemical process, polymer chemistry, material science, and nanotechnology. He manages an active docket of U.S. and foreign patent applications covering a key clinical drug candidate with multiple clinical trials for a global pharmaceutical company. He assists in IP due diligence, such as conducting freedom-to operate searches and analyses, patent landscape investigations, patentability analyses, and evaluating strengths and weaknesses of patent portfolios.

Xianfeng also has extensive experience in the research and preparation of patentability, clearance, infringement, and validity opinions. He has been involved in several contested proceedings before the USPTO, such as inter partes review and post grant review, including developing key arguments, working with technical experts, and preparing expert declarations. He also assists in ANDA Paragraph IV litigations, including pre-litigation due diligences such as analyzing global prosecution histories and patent strength, interviewing potential experts, and preparing invalidity and non-infringement contentions.

Xianfeng received his J.D. from The George Washington University Law School. While earning his Ph.D. at Princeton University, Xianfeng focused on the design, synthesis and characterization of large dendrimeric and macrocyclic polyphenylene structures. He discovered a series of highly efficient synthetic pathways to prepare super large polyphenyl/polyphenylene nanostructures. During his undergraduate training at Peking University, he conducted research in developing mono-substituted fullerene derivatives through controlled radical polymerization.    

Prior to joining the firm, Xianfeng was a research scientist in an international chemical company where he conducted research in synthesizing block copolymers and studying their applications as compatibilizers for wood-plastic composites and as impact modifiers for polycarbonate. He also invented a series of new impact modifiers through emulsion polymerization for biodegradable plastics and engineering resins.

Technical Publications

  • Shen, X., Ho, D. M., and Pascal, R. A., Jr. (2004) “Synthesis of Polyphenylene Dendrimers Related to ‘Cubic Graphite’”, Journal of the American Chemical Society, 126, 5798-5805.
  • Shen, X., Ho, D. M., and Pascal, R. A., Jr. (2003) “Synthesis and Structure of a Polyphenylene Macrocycle Related to ‘Cubic Graphite’”, Organic Letters, 5, 369-371.
  • Pascal, R. A., Jr., Mathai, M. S., Shen, X., and Ho, D. M. (2001) “Trimerization of a Steroid Ketone to Form a Chiral Molecular Cleft”, Angewandte Chemie International Edition, 40, 4746-4748.
  • Shen, X., He, X., Chen, G., Zhou, P., and Huang, L. (2000) “MALDI-TOF Mass Spectrometry Characterization of C60 end-capped Polystyrene Prepared by ATRP”, Macromolecular Rapid communications, 21, 1162-1165.