Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025

Showing 1–13 of 13 inventors

Rank Inventor Primary Company Patents
1 Tetsuji Tamura Sony 6
2 Yoshiyuki Kodama Seiko Epson 4
3 Makoto Hamamoto Pan Pacific Copper Co. 2
3 Kenta Nakakado Pan Pacific Copper Co. 2
#5 Yozo Ishihara Mitsui Mining & Smelting Co. 1
#5 Keiji One Chlorine Engineers Corp. 1
#5 Ikunobu Sumida Pan Pacific Copper Co. 1
#5 Masujiro Hisatani Mitsui Engineering & Shipbuilding Co. 1
#5 Yoshitsugu Shinomiya Chlorine Engineers Corp. 1
#5 Tadashi Bannou Hokko Chemical Industry Co. 1
#5 Shigeyuki Nakada Mitsui Engineering & Shipbuilding Co. 1
#5 Kozo Fujiwara Tohoku University 1
#5 Hirohumi Doi Dai-Ichi Electric Co. 1