Issued Patents All Time
Showing 26–50 of 61 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6225752 | Spark plug for internal combustion engine | Akio Kokubu, Kazumasa Yoshida, Makoto Yamaguchi | 2001-05-01 |
| 6215233 | Spark plug | — | 2001-04-10 |
| 6208066 | Semi-creeping discharge type spark plug | Akio Kokubu, Kazumasa Yoshida, Makoto Yamaguchi | 2001-03-27 |
| 6166480 | Spark plug | Kenji Ishida | 2000-12-26 |
| 6095124 | Spark plug and an internal combustion engine igniting system using the same | Kazumasa Yoshida, Akio Kokubo, Akira Suzuki, Makoto Yamaguchi | 2000-08-01 |
| 6091185 | Lateral electrode type spark plug with geometrical relationships with ground electrode | Akio Kokubu, Kazumasa Yoshida | 2000-07-18 |
| 5929556 | Spark plug with center electrode having variable diameter portion retracted from front end on insulator | Akio Kokubu, Kazumasa Yoshida | 1999-07-27 |
| 5873338 | Spark plug for an internal combustion engine | Tetsushi Suzuki, Yuuji Hirano, Kazuya Iwata | 1999-02-23 |
| 5866972 | Spark plug in use for an internal combustion engine | Hiroshi Ono | 1999-02-02 |
| 5831377 | Spark plug in use for an internal combustion engine | Iwao Kunitomo, Wataru Matsutani | 1998-11-03 |
| 5797383 | Dual polarity type ignition system for a spark plug group | Katsutoshi Nakayama | 1998-08-25 |
| 5793151 | Creeping discharge spark plug | Junichi Kagawa, Kozo Amano | 1998-08-11 |
| 5752488 | Method of controlling start of engine and device for carrying out the same | Kenichi Hattori | 1998-05-19 |
| 5734094 | Ion current detector device for use in an internal combustion engine | Mamoru Kodera, Masahiro Ishikawa, Terumasa Tomita | 1998-03-31 |
| 5680002 | Multi-polarity type spark plug for use in an internal combustion engine | Iwao Kunitomo, Kozo Amano | 1997-10-21 |
| 5554930 | Spark plug voltage probe device in an internal combustion engine | Shigeru Miyata, Hideji Yoshida, Yasuo Ito, Takashi Suzuki | 1996-09-10 |
| 5543716 | Sparkplug voltage probe for use with an internal combustion engine by clamping sparkplug cables with an insulation base | Shigeru Miyata, Yoshitaka Yamada, Hideji Yoshida, Yasuo Ito | 1996-08-06 |
| 5521509 | Device of estimating heat resistivity for a spark plug and a method of estimating the same | Masahiro Ishikawa | 1996-05-28 |
| 5491417 | Sparkplug voltage probe device having a capacitance compensating function for an internal combustion engine | Shigeru Miyata, Yoshitaka Yamada, Hideji Yoshida, Yasuo Ito | 1996-02-13 |
| 5477148 | Spark plug voltage probe device for use in an internal combustion engine | Shigeru Miyata, Hideji Yoshida, Yasuo Ito, Takashi Suzuki | 1995-12-19 |
| 5453694 | Snap-in type sparkplug voltage probe device for use in internal combustion engine | Shigeru Miyata, Yoshitaka Yamada, Hideji Yoshida, Yasuo Ito | 1995-09-26 |
| 5426370 | Spark plug voltage probe device for detecting a burning condition and reducing noise level in an internal combustion engine | Shigeru Miyata, Yoshitaka Yamada, Hideji Yoshida, Yasuo Ito | 1995-06-20 |
| 5365910 | Misfire detector for use in internal combustion engine | Shigeru Miyata, Hideji Yoshida, Yasuo Ito | 1994-11-22 |
| 5347855 | Misfire detector device for use in an internal combustion engine | Shigeru Miyata, Junichi Kagawa | 1994-09-20 |
| 5347856 | Misfire detector device for use in an internal combustion engine | Shigeru Miyata, Junichi Kagawa | 1994-09-20 |