Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5258974 | Optical read-out audio check disc with semitransparent defects or with single recorded tone | Katsuji Yokoyama | 1993-11-02 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5258974 | Optical read-out audio check disc with semitransparent defects or with single recorded tone | Katsuji Yokoyama | 1993-11-02 |