Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11215362 | Flame detection system and flame level detection method | Takashi Watanabe, Shigeki Ishii, Yuichi Kumazawa, Kayo SUZUKI | 2022-01-04 |
| 9453778 | Valve leak detecting method and combustion equipment | Shigeki Ishii, Yuuichi Kumazawa | 2016-09-27 |
| 9360213 | Valve leak detecting method and combustion equipment | Shigeki Ishii, Yuuichi Kumazawa | 2016-06-07 |
| 8618813 | Circuit fault detecting device and method | Shigeki Ishii | 2013-12-31 |
| 5555983 | Cash transaction apparatus | — | 1996-09-17 |