Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5591926 | Silver base electrical contact material | Koji Tsuji | 1997-01-07 |
| 5338505 | Silver base electrical contact material and method of making the same | Koji Tsuji, Yoshinbou Takegawa, Shuji Yamada | 1994-08-16 |
| 5198015 | Silver base electrical contact material and method of making the same | Koji Tsuji, Yoshinobu Takegawa, Shuji Yamada | 1993-03-30 |