Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7043813 | Manufacturing method for a spark plug | — | 2006-05-16 |
| 7021980 | Adjusting method for centering earth electrode at center electrode of spark gap of spark plug | — | 2006-04-04 |
| 6659826 | Manufacturing method for a spark plug | — | 2003-12-09 |
| 5465022 | Spark plug for internal-combustion engine and manufacture method of the same | Akio Katoh, Nobuo Abe, Kenji Horibe | 1995-11-07 |