KK

Keiji Kumagai

TK Toa Nenryo Kogyo: 2 patents #87 of 220Top 40%
OC Oki Electric Industry Co.: 1 patents #1,459 of 2,807Top 55%
Overall (All Time): #2,329,234 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4837193 Hydrotreating catalyst and process of manufacture Ikuo Akizuki, Hiroshi Kaya, Shohei Okano, Nobuo Otake, Yoshihito Kaneko 1989-06-06
4812634 IC card with a solar battery Satoshi Ohta, Kouzi Tanagawa, Hideo Yamamoto 1989-03-14