Hoon Cheong has been granted 3 US patents while listed as an inventor at Dpi Co.. The first was granted in 2008 and the most recent in April 2017. Hoon Cheong ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Hoon Cheong in Seojong-myeon, KR.