Koichi Takayanagi has been granted 3 US patents while listed as an inventor at Toa Eiyo. The first was granted in 2005 and the most recent in August 2015. Koichi Takayanagi ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Koichi Takayanagi in Saitama, JP.