Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5630115 | Method of rewriting information on a record medium by rewriting only changed portions | — | 1997-05-13 |
| 5392267 | Optical card reading and writing method with redundant directory storage to improve reliability | — | 1995-02-21 |
| 5349577 | Optical record medium including data record region and directory record region and method of managing file data | — | 1994-09-20 |