Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5608717 | Information recording media and optical disc presenting a character or a graphic pattern formed by specified pit patterns on data tracks | Tamotsu Ito, Ryuichi Koike, Takashi Takeuchi | 1997-03-04 |