Sergey E. Tkatchenko has been granted 2 US patents while listed as an inventor at Stc.Unm. The first was granted in 2011 and the most recent in July 2013. Sergey E. Tkatchenko ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Sergey E. Tkatchenko in San Diego, CA, US.