Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5293129 | Ionic current sensing apparatus for engine spark plug with negative ignition voltage and positive DC voltage application | Masayuki Ikeuchi, Shigemi Murata, Toshio Iwata, Toshio Ohsawa | 1994-03-08 |