TO

Tohru Okui

OB Obayashi: 1 patents #58 of 118Top 50%
OC Osaka Gas Co.: 1 patents #252 of 689Top 40%
Overall (All Time): #3,748,764 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
5540771 Concrete product using aggregates obtained by pulverizing melt slags and the method of fabricating the same Minoru Hata, Takeshi Tsunemi 1996-07-30