Issued Patents All Time
Showing 51–67 of 67 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5846390 | Non-membrane water electrolyzer | Toshio Eki, Toshiharu Otsuka, Akemi Kuroda | 1998-12-08 |
| 5578895 | Spark plug having a noble metal electrode tip | — | 1996-11-26 |
| 5578894 | Spark plug for use in internal combustion engine | — | 1996-11-26 |
| 5461275 | Spark plug for use in an internal combustion engine | — | 1995-10-24 |
| 5440198 | Spark plug having a noble metal firing tip bonded to a front end of a center electrode | Tsutomu Okayama | 1995-08-08 |
| 5347193 | Spark plug having an erosion resistant tip | Kazuya Iwata, Tsutomu Okayama | 1994-09-13 |
| 5320569 | Method of making a spark plug | Mamoru Musasa, Tsutomu Okayama, Kazuya Iwata | 1994-06-14 |
| 5273474 | Method of manufacturing a center electrode for a spark plug | Tsutomu Okayama | 1993-12-28 |
| 5210457 | Outer electrode for spark plug and a method of manufacturing thereof | Minoru Ando | 1993-05-11 |
| 5204579 | Ceramic insulator for spark plug structure | Shigeyasu Yamada, Kazuhiko Kozuka | 1993-04-20 |
| 5172025 | Glass sealant of spark plug insulator for use in an internal combustion engine | Hiroyasu Ogura | 1992-12-15 |
| 5101135 | Spark plug for use in an internal combustion engine | — | 1992-03-31 |
| 5017826 | Rapid heat-dissipating type spark plug for internal combustion engines | Kozuka Kazuhiko | 1991-05-21 |
| 4967116 | Spark plug having heat- and corrosion-resistant surface | — | 1990-10-30 |
| 4949006 | Spark plug structure | Kazuhiko Kozuka, Shigeyasu Yamada | 1990-08-14 |
| 4700103 | Spark plug and its electrode configuration | Takashi Yamaguchi, Shinichi Nakamura | 1987-10-13 |
| 4670684 | Spark plug | Junichi Kagawa | 1987-06-02 |