Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874439 | Synchronizer ring in speed variator made of wear-resistant copper alloy having high strength and toughness | — | 1989-10-17 |
| 4872048 | Semiconductor device having copper alloy leads | Takuro Iwamura, Masao Kobayashi | 1989-10-03 |