Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873559 | Semiconductor memory device and a process for producing the same | Osamu Tsuchiya, Katsuyuki Sato | 1989-10-10 |
| 4845544 | Semiconductor integrated device having a field-effect transistor type memory cell array and peripheral circuitry structure | — | 1989-07-04 |