AH

Akihiko Hirayama

TK Toda Kogyo: 3 patents #117 of 328Top 40%
📍 Sanyo Onoda, JP: #7 of 50 inventorsTop 15%
Overall (All Time): #1,669,843 of 4,157,543Top 45%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
4851292 Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same Norimichi Nagai, Norio Sugita, Masao Kiyama, Toshio Takada, Katsunori Fujimoto +1 more 1989-07-25
4806429 Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same Norimichi Nagai, Norio Sugita, Masao Kiyama, Toshio Takada, Katsunori Fujimoto +1 more 1989-02-21
4781981 Plate-like magnetoplumbite ferrite particles for magnetic recording and process for producing the same Tsutomu Katamoto, Norimichi Nagai, Yasutaka Ota, Katsunori Fujimoto, Masao Kiyama 1988-11-01