Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6479874 | Semiconductor memory device having multilevel memory cell and method of manufacturing the same | Kenji Hibino, Kazuyuki Yamasaki, Tetsuji Togami, Hironori Sakamoto, Kiyokazu Hashimoto | 2002-11-12 |
| 6221723 | Method of setting threshold voltage levels of a multiple-valued mask programmable read only memory | — | 2001-04-24 |
| 5960287 | Method for manufacturing semiconductor memory devices having a ROM device | — | 1999-09-28 |
| 5854110 | Process fabricating semiconductor device having two ion-implantations carried out by using a shared photo-resist mask | — | 1998-12-29 |
| 5538917 | Fabrication method of semiconductor integrated circuit device | — | 1996-07-23 |
| 5470774 | Fabrication method of a read-only semiconductor memory device | — | 1995-11-28 |