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Yoshifumi Yamakawa

SO Sony: 4 patents #8,966 of 25,231Top 40%
📍 Shinagawa, JP: #236 of 807 inventorsTop 30%
Overall (All Time): #1,266,418 of 4,157,543Top 35%
4
Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
6778182 Display device — 2004-08-17
6654028 Display device — 2003-11-25
6069612 Clear blue circuit for use with computer monitors and the like — 2000-05-30
4682231 Brightness and contrast adjusting apparatus — 1987-07-21