Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5663905 | Semiconductor memory device comprising two kinds of memory cells operating in different access speeds and methods of operating and manufacturing the same | Tomohisa Wada, Kazutoshi Hirayama, Shigeki Ohbayashi | 1997-09-02 |
| 5659515 | Semiconductor memory device capable of refresh operation in burst mode | Tomohisa Wada | 1997-08-19 |
| 5646885 | Fast accessible non-volatile semiconductor memory device | Makoto Yamamoto | 1997-07-08 |
| 5598020 | Semiconductor integrated circuit device and method of manufacturing the same | — | 1997-01-28 |