YK

Yokoyama Kenji

NS Nippon Gakki Seizo: 2 patents #116 of 332Top 35%
Yamaha: 1 patents #1,232 of 2,001Top 65%
Overall (All Time): #1,637,275 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
5712515 Power source adaptor Ito Shin 1998-01-27
4568840 Variable resistance circuit — 1986-02-04
4509101 Protection circuit for switching power amplifier — 1985-04-02