Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5668756 | Multi-value level type non-volatile semiconductor memory unit and method of rewriting the same | — | 1997-09-16 |
| 5641989 | Semiconductor device having field-shield isolation structures and a method of making the same | — | 1997-06-24 |
| 5640032 | Non-volatile semiconductor memory device with improved rewrite speed | — | 1997-06-17 |
| 5596527 | Electrically alterable n-bit per cell non-volatile memory with reference cells | Shoichi Iwasa, Yasuo Sato, Toshio Wada, Kenji Anzai | 1997-01-21 |