Issued Patents 2002
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6455454 | Semiconductor ceramic, semiconductor ceramic element and circuit protection element | Tetsukazu Okamoto, Toshiharu Hirota | 2002-09-24 |
| 6432558 | Semiconductor ceramic and semiconductor ceramic device | Tetsukazu Okamoto, Toshiharu Hirota, Yoshitaka Nagao | 2002-08-13 |
| 6362521 | Semiconductor ceramic and device using the same | Tetsukazu Okamoto, Toshiharu Hirota, Noriyuki Yamamoto | 2002-03-26 |
| 6346496 | Composite material for positive temperature coefficient thermistor, ceramic for positive temperature coefficient thermistor and method for manufacturing ceramics for positive temperature coefficient thermistor | Tetsukazu Okamoto, Toshiharu Hirota, Noriyuki Yamamoto | 2002-02-12 |