Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880707 | Stick of composite materials and process for preparation thereof | Yuichiro Kohno | 1989-11-14 |
| 4861673 | Composite sintered material having sandwich structure | Akihiko Yamamura | 1989-08-29 |