Shosuke Oku has been granted 2 US patents while listed as an inventor at Nippon Ester Co.. The first was granted in 1989 and the most recent in April 1992. Shosuke Oku ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Shosuke Oku in Sabae, JP.