Nakagawa; Seiki
Patent Applications and Registrations
Patent applications and USPTO patent grants for Nakagawa; Seiki.The latest application filed is for "spark plug".
- Nakagawa; Seiki - Takahama JP
- Nakagawa, Seiki - Takahama-city JP
| Patent | Date |
|---|---|
| Spark plug having iridum alloy tip, iron-based alloy tip bonding portion and stress relieving layer therebetween Grant 6,621,198 - Kanao , et al. September 16, 2 | 2003-09-16 |
| Spark plug App 20010013746 - Kanao, Keiji ; et al. | 2001-08-16 |
| Sintered ceramic filter structure having body compressively stressed by sintered ceramic material having different sintering shrinkage ratio Grant 4,732,593 - Kondo , et al. March 22, 1 | 1988-03-22 |
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