Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6970167 | Multi-level management system for monitoring communication apparatuses | Yoshihito Kumamoto, Ichiro Ayukawa | 2005-11-29 |
| 5319246 | Semiconductor device having multi-layer film structure | Katuhiko Tamura, Toru Koyama | 1994-06-07 |
| 5200808 | Semiconductor device having smooth contact holes formed through multi-layer insulators of different etching speeds | Toru Koyama, Katuhiko Tamura | 1993-04-06 |