Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886035 | Air-fuel ratio control method for an internal combustion engine | Norio Tomobe, Haruo Shimamura, Kozo Suzuki, Yuji Fujiki | 1989-12-12 |
| 4867843 | Surface roughening of ceramics and application to production of ceramic wiring board | Masayoshi Ikeda, Yukihisa Hiroyama | 1989-09-19 |