Hiroaki Okamoto

Ricoh Company: 21 patents #1,013 of 9,818Top 15%

Fujitsu Limited: 18 patents #1,600 of 24,456Top 7%

TC Toyo Kohan Co.: 10 patents #19 of 295Top 7%

KT Kabushiki Kaisha Toshiba: 5 patents #5,683 of 21,451Top 30%

OC Okamoto Chemical Industry Co.: 4 patents #1 of 10Top 10%

SC Sumitomo Chemical: 4 patents #1,124 of 4,033Top 30%

IJ Immuno Japan: 4 patents #2 of 7Top 30%

NU National University Corporation Yamaguchi University: 3 patents #1 of 6Top 20%

UN Unknown: 3 patents #7,366 of 83,584Top 9%

MC Minolta Co.: 2 patents #718 of 1,416Top 55%

Canon: 1 patents #14,899 of 19,416Top 80%

NI Nikon: 1 patents #1,647 of 2,493Top 70%

NS Nippon Soken: 1 patents #783 of 1,540Top 55%

NC Nippondenso Co.: 1 patents #1,765 of 3,479Top 55%

OC Osaka Transformer Co.: 1 patents #4 of 15Top 30%

SC Sanyo Electric Co.: 1 patents #3,644 of 6,347Top 60%

TC Tottori Sanyo Electric Co.: 1 patents #85 of 224Top 40%

YU Yamaguchi University: 1 patents #44 of 132Top 35%

AE Asahi Kasei E-Materials: 1 patents #57 of 141Top 45%

📍 Ooita, JP: #1 of 516 inventorsTop 1%

Overall (All Time): #23,130 of 4,157,543Top 1%

Patents All Time

Issued Patents All Time

Showing 76–79 of 79 patents

Patent #	Title	Co-Inventors	Date
5021103	Method of forming microcrystalline silicon-containing silicon carbide film	Yoshihiro Hamakawa, Yutaka Hattori	1991-06-04
4955191	Combustor for gas turbine	Takeshi Takahara, Fukuo Maeda	1990-09-11
4496788	Photovoltaic device	Yoshihiro Hamakawa, Kouji Okuda	1985-01-29
4271328	Photovoltaic device	Yoshihiro Hamakawa, Yoshiteru Nitta, Toshio Adachi	1981-06-02