Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4654510 | PTC heating apparatus | Kazumasa Umeya, Hisao Senzaki, Hisao Nakagawa, Shoji Koyama, Hideshi Kataoka | 1987-03-31 |
| 4245146 | Heating element made of PTC ceramic material | Kazumasa Umeya, Kazunari Yonezuka, Hisao Senzaki | 1981-01-13 |
| 4232214 | PTC Honeycomb heating element with multiple electrode layers | Tamotu Yamauchi | 1980-11-04 |