Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875939 | Precombustion chamber construction for an internal combustion engine | Yasuhiro Miyakawa | 1989-10-24 |
| 4856472 | Cylinder head with ceramic precombustion chamber | Akinori Wakasa, Yasuhiro Miyakawa, Seiichi Asami | 1989-08-15 |
| 4853226 | Sustained-release particulate preparation and process for preparing the same | Masayuki Arakawa | 1989-08-01 |
| 4844037 | Precombustion chamber construction for internal combustion engine | Yasuhiro Miyakawa | 1989-07-04 |
| 4834042 | Ceramic precombustion chamber for internal combustion engine | Akinori Wakasa, Kazuyuki Mizoguchi | 1989-05-30 |
| 4809654 | Ceramic precombustion chamber construction of internal combustion engine | Takayuki Ogasawara, Akinori Wakasa, Hideki Hosokawa, Itsuo Kondo | 1989-03-07 |