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Mark R. Leslie

Fax +1.412.355.6501
Mr. Leslie began practice with K&L Gates in 1991 and has been a partner in the firm since 1998. Mr. Leslie is a member of K&L Gates’ Intellectual Property and Technology groups. Mr. Leslie’s practice includes patent and trademark acquisition, prosecution, policing and enforcement, product clearance, technology transfer, and the preparation of opinions and agreements related to patents, trademarks, and other intellectual property. Mr. Leslie manages the patent and trademark portfolios, and provides day-to-day intellectual property counseling, to a number of large companies. Mr. Leslie also has been involved in intellectual property litigation, including patent infringement litigation before the federal district courts and before the U.S. Court of Appeals for the Federal Circuit, the federal appellate level court having exclusive jurisdiction over appeals in patent cases.

Mr. Leslie’s technical concentration is in the materials science, chemical, and mechanical areas. Mr. Leslie coordinates the Intellectual Property Group’s Materials Science subgroup, which gathers together those registered patent attorneys having particular interest and experience in patent prosecution and counseling in the materials science area, which broadly includes metals, ceramics, and polymers. Examples of areas of materials science in which Mr. Leslie has been involved include ore beneficiation, carbon steel and stainless steel alloy design and production, metal casting, cemented carbide production, fabrication of nickel-base and other high performance alloys, powder metallurgy processing, metal powder atomization, cutting tool design, magnetic alloys and powders, cathode and anode cell design, micro-mechanical structure fabrication, and synthetic fiber spinning.

Professional Background

Upon graduation from law school, Mr. Leslie served as judicial clerk to Circuit Judge Glenn L. Archer, Jr., in the United States Court of Appeals for the Federal Circuit.

Prior to law school, Mr. Leslie was employed as a patent examiner in the organic chemical section of the United States Patent and Trademark Office.


Graduate Work at the Pennsylvania State University and the University of Pittsburgh (Materials Science)

Professional/Civic Activities

  • Allegheny County Bar Association
  • ASM International
  • Association of University Technology Managers
  • Minerals, Metals, and Materials Society
  • Pennsylvania Bar Association
  • Pittsburgh Intellectual Property Law Association