Issued Patents All Time
Showing 51–60 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5736809 | Method of making a spark plug including laser welding a noble metal layer to a firing end of electrode | Kozo Amano | 1998-04-07 |
| 5607605 | Laser welding device, a method of checking welding condition and a method of making a center electrode for a spark plug | Mamoru Musasa | 1997-03-04 |
| 5497045 | Spark plug having a noble metal electrode portion | Junichi Kagawa | 1996-03-05 |
| 5478265 | Spark plug and a method of making of same | Junichi Kagawa | 1995-12-26 |
| 5461276 | Electrode for a spark plug in which a firing tip is laser welded to a front end thereof | Junichi Kagawa | 1995-10-24 |
| 5461210 | Method of manufacturing a spark plug electrode | Junichi Kagawa | 1995-10-24 |
| 5448130 | Spark plug electrode for use in internal combustion engine | Mamoru Musasa | 1995-09-05 |
| 5395273 | Method of making a ground electrode for a spark plug | — | 1995-03-07 |
| 5144188 | Spark plug for internal combustion engine | Junichi Kagawa | 1992-09-01 |
| 4914343 | Spark plug with counterelectrode having plural apertures in flat portion thereof | Junichi Kagawa, Alfred Krappel, Josef Holzmann, Johannes Guggenmos | 1990-04-03 |