Mark Leslie is admitted to practice in Pennsylvania and by the United States
Patent and Trademark Office. He is not currently admitted in the District of
Columbia. He is supervised by a member of the D.C. Bar.
Mark Leslie began practice with K&L Gates in 1991 and has been a partner in
the firm since 1998. He is a member of K&L Gates’ Intellectual Property
and Technology groups. Mark’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. Mark manages the patent and trademark
portfolios, and provides day-to-day intellectual property counseling, to a number of
large companies. He has also been involved in intellectual property
litigation, including patent infringement litigation before the federal district
courts and before the US Court of Appeals for the Federal Circuit, the federal
appellate level court having exclusive jurisdiction over appeals in patent cases.
Mark’s technical concentration is in the materials science, chemical, and
mechanical areas. He 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 Mark 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.
