Issued Patents 2003
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6621198 | Spark plug having iridum alloy tip, iron-based alloy tip bonding portion and stress relieving layer therebetween | Keiji Kanao | 2003-09-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6621198 | Spark plug having iridum alloy tip, iron-based alloy tip bonding portion and stress relieving layer therebetween | Keiji Kanao | 2003-09-16 |