Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7723906 | Spark plug designed to minimize drop in insulation resistance | Satoru Kadowaki | 2010-05-25 |
| 6956319 | Structure of spark plug designed to provide higher wear resistance to center electrode and production method thereof | Ken Hanashi | 2005-10-18 |
| 6794803 | Spark plug for an internal combustion engine | Tsunenobu Hori, Hironori Osamura, Akira Mitsuhashi, Mineo Okuma | 2004-09-21 |
| 6552476 | Spark plug for internal combustion engine having better self-cleaning function | Ken Hanashi, Hironori Osamura | 2003-04-22 |
| 6316868 | Spark plug for internal combustion engine having better self-cleaning function | Hironori Osamura, Makoto Yatou | 2001-11-13 |
| 4937484 | Sparking plug | — | 1990-06-26 |