Issued Patents All Time
Showing 26–50 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6838809 | Chromate film-containing plug metal component and method for producing the same | Hiroaki Nasu, Makoto Sugimoto, Mitsuru Yoshida | 2005-01-04 |
| 6791245 | Glow plug and spark plug, and manufacturing method therefor | Hiroaki Nasu, Chiaki Kumada, Katsunari Ninomiya | 2004-09-14 |
| 6768249 | Spark plug and producing method therefor | Hiroaki Nasu | 2004-07-27 |
| 6724133 | Spark plug with nickel alloy electrode base material | Naomichi Miyashita, Yoshihiro Matsubara, Masayuki Segawa, Hiroaki Kuki, Mamoru Musasa | 2004-04-20 |
| 6710523 | Spark plug internal combustion engine | Masayuki Segawa | 2004-03-23 |
| 6688932 | Method for manufacturing spark plug and caulking metallic mold | Hiroaki Nasu, Yoshito Uemura, Makoto Sugimoto, Hirohito Ito | 2004-02-10 |
| 6664719 | Spark plug | Masayuki Segawa, Satoko Ito | 2003-12-16 |
| 6597089 | Spark plug for internal combustion engine | — | 2003-07-22 |
| 6573641 | Spark plug | — | 2003-06-03 |
| 6538365 | Metal member with chromate coat, spark plug with chromate coat and manufacturing methods thereof | Hiroaki Nasu, Yoshito Uemura | 2003-03-25 |
| 6533628 | Method of manufacturing spark plug and spark plug | — | 2003-03-18 |
| 6528929 | Spark plug with iridium-based alloy chip | Hiroaki Nasu | 2003-03-04 |
| 6489709 | Captive spark plug gasket | Hideki Teramura | 2002-12-03 |
| 6437493 | Glow plug and spark plug, and manufacturing method therefor | Hiroaki Nasu, Chiaki Kumada, Katsunari Ninomiya | 2002-08-20 |
| 6304022 | Spark plug | — | 2001-10-16 |
| 6236148 | Spark plug with specific metal shell coating | Hiroaki Nasu, Chiaki Kumada, Katsunari Ninomiya | 2001-05-22 |
| 6166479 | Spark plug having a spark discharge portion with a specific composition | Ichiro Gonda | 2000-12-26 |
| 6121719 | Spark plug having a multi-layered electrode | Hiroaki Nasu | 2000-09-19 |
| 6046532 | Spark plug | Ichiro Gonda | 2000-04-04 |
| 5998913 | Spark plug with iridium-rhodium alloy discharge portion | — | 1999-12-07 |
| 5894186 | Spark plug with igniting portion chip composition | Koji Okazaki | 1999-04-13 |
| 5869921 | Spark plug for internal combustion engine having platinum and iridium alloyed emissive tips | Tsutomu Okayama | 1999-02-09 |
| 5866973 | Spark plug having a platinum tip on an outer electrode | Junichi Kagawa | 1999-02-02 |
| 5831377 | Spark plug in use for an internal combustion engine | Yoshihiro Matsubara, Iwao Kunitomo | 1998-11-03 |
| 5793793 | Spark plug | Junichi Kagawa | 1998-08-11 |