Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8523624 | Spark plug for internal combustion engine and manufacturing method thereof | Keiji Kanao, Ken Hanashi | 2013-09-03 |
| 8398447 | Method for manufacturing spark plug for internal-combustion engine | Ken Hanashi, Satoru Kadowaki, Tsunenobu Hori, Hirotaka Aida, Hiroya Ishiguro | 2013-03-19 |
| 8339021 | Spark plug for internal-combustion engine and method for manufacturing the same | Ken Hanashi, Satoru Kadowaki, Tsunenobu Hori, Hirotaka Aida, Hiroya Ishiguro | 2012-12-25 |
| 8258686 | Spark plug for internal combustion engine | Keiji Kanao, Ken Hanashi | 2012-09-04 |